1 October

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 01:48
  Can I use ffmpeg to resize the timeline of a video file? - MrNobody Newest 'ffmpeg' Questions - Stack Overflow
  I need to stretch the video to fit a specific time. Is it possible with ffmpeg or do you guys know any other tool that could do the the work?
• 01:25
  When streaming with ffmpeg, insert audio only if the source file/stream has no audio - Dan Pisarski Newest 'ffmpeg' Questions - Stack Overflow
  I would like to use the same command, regardless of if my source file, or source stream, has an audio track or has no track at all. I then want ffmpeg to transcode the audio - using either the audio source (if present), or silence (which I see various various ffmpeg audio filters can generate) only if no source audio track is present. Could someone give an example or some pointers on the right command for this? Some way to do this with map or similar switches? Note here I truly mean no audio track at all, versus say detecting silence in the source audio track. It is a key to be (...)
• 01:19
  How to make mpv more compatible with ffmpeg filters like minterpolate? - F usedEmacs -con fused Newest 'ffmpeg' Questions - Stack Overflow
  ffmpeg filter minterpolate (motion interpolation) does not work in MPV. (Nevertheless the file then is played normally without the minterpolate). (I researched using search engines and throughout documentation and troubleshooted to make a use of opengl and generally tried everything apart from asking for help and learning to understand more in the source code and I'm not a programmer)… gpu-context=angle --gpu-api=opengl also does not make opengl work. (I'm guessing opengl could help from seeing its use in the documentations).  (...) -- http://ffmpeg.org/ffmpeg-filters.html

30 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 21:52
  Fluent FFMPEG complex filter to split file into multiple outputs - lowcrawler Newest 'ffmpeg' Questions - Stack Overflow
  It appears possible to have multiple outputs from a single FFMPEG command: ffmpeg overlay on multiple outputs I'd like to know how to do this in FFMPEG. I'm specifically using the complexFilter option in an attempt to split the video into 4 different sizes and place an overlay, and then save the 4 resulting files. The code is my attempt to simply split the video into 4 and save it. I get the Error: ffmpeg exited with code 1: Filter split:output3 has an unconnected output error. I'm unsure how to connect the output to a file in fluent-ffmpeg. let ffmpegCommand (...)
• 21:42
  Split video into images with ffmpeg-python - sgt pepper Newest 'ffmpeg' Questions - Stack Overflow
  As far as I understand ffmpeg-python is main package in Python to operate ffmpeg directly. Now I want to take a video and save it's frames as separate files at some fps. There are plenty of command line ways to do it, e.g. ffmpeg -i video.mp4 -vf fps=1 img/output%06d.png described here But I want to do it in Python. Also there are solutions [1] [2] that use Python's subprocess to call ffmpeg CLI, but it looks dirty for me. Is there any way to to make it using (...) -- ffmpeg-python, described here, [1], [2]
• 20:51
  How can I delete a file in FOR loop in batch scripting after another command? - Andrew Anderson Newest 'ffmpeg' Questions - Stack Overflow
  I compress a video with FFMPEG by means of a batch scripting one-liner with a FOR LOOP. After compressing I want to remove the original file. This code perfectly makes the compressing job, but the original file is not being removed: for %%i in (*.mp4) do ffmpeg -i "%%i" -vcodec libx265 -crf 28 "%%~ni"-small.mp4&&del "%%i" pause What have I missed? By the way, this is a near to perfect compression ratio for any kinds of educational videos, tutorials, etc. which have occupied your hard (...)
• 19:39
  Record ip camera streaming with two login authentication - oxorio Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to record a stream with ffmpeg, VLC or OBS that before you view the stream player you need to login with a microsoft account, the URL is something like this https://yourwebsite.msappproxy.net/Camera/player.html?stats=1 And after you login you have to insert a username and password to watch the camera you want to see. I've got the .m3u8 and tried to play it on VLC but doesn't start the streaming, searching i found that you can add the credentials to the stream link but this doesn't work (...)
• 19:29
  RTMP proxy to crop original video and send it to another RTMP server - Nicola Peluchetti Newest 'ffmpeg' Questions - Stack Overflow
  I need to crop the video from an RTMP stream and send it to another RTMP server which always change. My understanding is that I should use nginx-proxy and ffmpeg, can anybody help me on how to set it up? I suppose that i need to send the stream to an endpoint like /stream/:stream-key/:next-server-ip process the stream with ffmpeg and then send it to the :next-server-ip, what language should I use in the backend for this?
• 16:59
  Video with music taking long time - Konduri Sai Aditya Newest 'ffmpeg' Questions - Stack Overflow
  Hi I am rendering video with filters and adding audio at the end. But while running it is taking a long time and rendering continuously. Can anyone help me where I am wrong? below is the command ffmpeg -i test.png -i test.mp4 -i test.mp3 -y -filter_complex "[1:v]scale=1422:800[scale1],[scale1]rotate=0:c=blackⓐ0:ow=rotw(0):oh=roth(0)[rotate0],[0:v][rotate0]overlay=258.04:107.71[mediaoverlayout0],color=blackⓐ0:451x137[c1],[c1]setsar=1,drawtext=fontfile='/Windows/fonts/Peddana-Regular.ttf':text='ADITYA':fontsize=121.199:fontcolor=#1e8bc3:line_spacing=16.91,rotate=0:ow=rot
• 16:59
  Sending Pictures over Network with Unity C# - TobiGG B. Newest 'ffmpeg' Questions - Stack Overflow
  I am currently working with the HoloLens and thus Unity. The idea is to make a webcam Livestream with as little delay as possible to an instance of FFmpeg on a different device for encoding. However, I run into some issues. My first problem is the Conversion from a Color32 Array to a Byte Array. It creates a huge amount of bandwidth, especially when I am trying to record and stream with 30fps and a 1280x720 resolution. Here is some code: IEnumerator Init() webCam = new WebCamTexture(1280, 720, 30); webCam.Play(); image.texture = webCam;  (...)
• 15:48
  RN CameraRoll gives uri as ph: // - Roman Adigezalov Newest 'ffmpeg' Questions - Stack Overflow
  Faced such a problem, I get a video using CameraRoll in order to later transfer this file to FFMpeg, but the problem arises in the fact that the path to the file is on ios using the ph protocol. How to be in this situation? How do I get real access to the file?
• 15:41
  How to get better quality converting MP4 to WMV with ffmpeg? - Edward Tanguay Newest 'ffmpeg' Questions - Stack Overflow
  I am converting MP4 files to WMV with these two rescaling commands: ffmpeg -i test.mp4 -y -vf scale=-1:360 test1.wmv ffmpeg -i test.mp4 -y -vf scale=-1:720 test2.wmv I've also tried: ffmpeg -g 1 -b 16000k -i test1.mp4 test1.wmv However, the .wmv files that are produced are "blocky and grainy" as you can see here in a small section of a video screenshot: These are the sizes: test.mp4 - 106 MB test1.wmv - 6 MB test2.wmv - 16 MB How can I increase the quality/size of the resulting (...)
• 15:10
  ffmpeg : sws_scale not able to convert image from YUV to RGB - Abhinav Singh Newest 'ffmpeg' Questions - Stack Overflow
  I m trying to convert my image from YUV420P to RGB24 below is my code for extracting the frame and decoding it, frame extracting while(av_read_frame(avc,avpacket) == 0) if(avpacket->stream_index == videoStream) int res = avcodec_send_packet(avctx,avpacket); if(res == AVERROR(EAGAIN)) continue; else if(respix_fmt,AV_PIX_FMT_RGB24); displayImage(avframeRGB); Function convertImage void convertImage(AVFrame** frame, AVPixelFormat srcFmt, AVPixelFormat destFmt) AVFrame* tframe = *frame; struct (...)
• 14:57
  Audio in ffmpeg - Konduri Sai Aditya Newest 'ffmpeg' Questions - Stack Overflow
  I need to add audio as an input to below command, How can I achieve it ffmpeg -i test.png -i test.mp4 -y -filter_complex "[1:v]scale=1422:800[scale1],[scale1]rotate=0:c=blackⓐ0:ow=rotw(0):oh=roth(0)[rotate0],[0:v][rotate0]overlay=258.04:107.71[mediaoverlayout0],color=blackⓐ0:451x137[c1],[c1]setsar=1,drawtext=fontfile='/Windows/fonts/Peddana-Regular.ttf':text='ADITYA':fontsize=121.19999999999999:fontcolor=#1e8bc3:line_spacing=16.91,rotate=0:ow=rotw(0):oh=roth(0):c=blackⓐ0[rottext1],[mediaoverlayout0][rottext1]overlay=x=544.63:y=263.076:shortest=1" -pix_fmt yuv420p (...)
• 14:22
  Is celery a good choice for long running tasks? - jasoos Newest 'ffmpeg' Questions - Stack Overflow
  We are using a combination of django, rabbitmq, celery and ffmpeg to read camera streams and break them into images to be stored into filesystem. This setup works 24x7. Now, for each camera stream we are creating a separate task and each will theoretically run for indefinite period. If a stream goes down, we wait for n number of frames, create an exception and in the exception handler, after creating a delay of 1 min using time.sleep we rerun the ffmpeg process. My questions are, Is this a right approach? Should we use celery for reading streams? Is celery the right (...)
• 13:01
  MobileFFMPEG Output file #0 does not contain any stream - Alhaj Newest 'ffmpeg' Questions - Stack Overflow
  I am using implementation 'com.arthenica:mobile-ffmpeg-full:4.4' I just want o crop audio file to 10 second to 20 second ''' fun cropAudio(input :String) val newFileName = UUID.randomUUID().toString() val location: String = getBatchDirectoryName()!! val output: String = location + "/" + newFileName + ".mp3" val temp=" -i $input -ss 60 -to 70 $output" Log.e("alhaj", " a $s") FFmpeg.execute(temp, object : ExecuteCallback fun onSuccess(message: String?)  (...)
• 12:18
  ffmpeg video trim out of memory and crashing - mdkamrul Newest 'ffmpeg' Questions - Stack Overflow
  I used ffmpeg for video trim, but this crashing page and showing out of memory. here is my command for trim ["-i", "video.mp4", "-ss", "00:00", "-c", "copy", "-to", "01:26", "output.mp4"] please help me for this
• 12:06
  how to create a m3u8 file in php [duplicate] - Rangga 21 Newest 'ffmpeg' Questions - Stack Overflow
  how do I make it like this in php, whether using ffmpeg or something else I need a reference to make this
• 11:37
  How to set fps in python decord library? - Sathish Kumar Newest 'ffmpeg' Questions - Stack Overflow
  package link : https://github.com/dmlc/decord I am using decord to extract frames and it does a good job, by default it uses video fps. Lets say i need to extract frame at 0.2 fps. example : i have a video at 48 seconds and its fps is 30. when i extract i get 1440 frames But, I need to specify the fps like 0.2 so , the output should be 10 frames. PS. In ffmpeg, we can specify the fps while extracting. I am asking in the same way. My code: from decord import VideoReader from matplotlib import pyplot as plt vr = (...) -- https://github.com/dmlc/decord
• 11:33
  ffmpeg video trim out of memory and cashing - mdkamrul Newest 'ffmpeg' Questions - Stack Overflow
  I used ffmpeg for video trim, but this crashing page and showing out of memory. here is my command for trim ["-i", "video.mp4", "-ss", "00:00", "-c", "copy", "-to", "01:26", "output.mp4"] please help me for this
• 10:26
  Java open CV hangs on VideoCapture for file if openCV is loaded with nu.pattern.OpenCV.loadShared(); - Ilya Yevlampiev Newest 'ffmpeg' Questions - Stack Overflow
  I have a sample code from https://ratiler.wordpress.com/2014/09/08/detection-de-mouvement-avec-javacv/ with small difference in loading the open cv library in the static block using nu.pattern.OpenCV.loadShared(); : import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import org.opencv.core.CvType; import org.opencv.core.Mat; import (...) -- https://ratiler.wordpress.com/2014/09/08/detection-de-mouvement-avec-javacv/
• 10:04
  FFMPEG Extract subtitles at webvtt format while keep position on the screen - Maxou Newest 'ffmpeg' Questions - Stack Overflow
  i'm working on a project where I need to extract subtitles from video files and convert it to WEBVTT format. But when I extract and convert it with FFMPEG my webvtt files doesn't keep the position. What I want 00:00:11.000 --> 00:00:13.000 align:start What I get 00:00:11.000 --> 00:00:13.000 While when I test to extract at .ass files the position of the subtitles is keep. To extract I use this command ffmpeg -i filename -map 0:s:0 -muxdelay 0 -f webvtt subtitles.vtt Thanks in (...)
• 10:00
  How can I pipe output of ffmpeg to ffplay in java? - guidop21 Newest 'ffmpeg' Questions - Stack Overflow
  currently i have created a java project that allows me to use ffmpeg to split a live video coming from a webcam and fragment it into many 60 second video clips. These are the main methods: ⓐOverride public boolean startRecording(String fileName, Integer clipPrefix, String folderClipName) final String methodName = "startRecording(fileName, folderClipPath)"; this.startLog(methodName, fileName, folderClipName); try File folder = new File(folderClipName + System.getProperty("file.separator") +fileName); if( !folder.exists() )  (...)
• 05:47
  Express - FFMPEG: Serve transcoded video instead of static video file - No stupid questions Newest 'ffmpeg' Questions - Stack Overflow
  I am creating a website to host videos downloaded on my computer online. However, many of these videos are not in a web friendly format (like .mkv or .flv). It is not an option to convert these files on the disk and then serve them as static files, converting needs to be done live by the server. I want to transcode these videos with ffmpeg to a web friendly format like webm. So far, I have been able to somewhat successfully transcode a video and serve it: import express from 'express'; import cors from 'cors'; import ffmpeg from (...)
• 05:39
  uwp app throw error when install from package but works fine in any mode when run directly launching from visual studio - Abhishek Sharma Newest 'ffmpeg' Questions - Stack Overflow
  I have created an app wrapping FFmpeg in uwp now for the requirement I have all the major dll of FFmpeg and then set to content and copy always in property now when I launch the app installed from the visual studio in any mode weather release, debug, x86,x64 it works fine but as I created a package and then install the app and run it, it throws an error where it says that dll not found not directly but says file not found which is because of dll because I face that problem in debug mode before and it's because of dll not available to uwp you can look at the project here: (...) -- https://github.com/AbhiSharma9350/Winfftool
• 05:00
  FFmpeg.AutoGen on UWP platform - Dimitris Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to use the FFmpeg.AutoGen packages on UWP (Universal Windows Platform) project?
• 02:59
  Decoding an MKA audio file into raw data of the pcm_alaw type (MKA Audio to pcm_alaw) - bbdd Newest 'ffmpeg' Questions - Stack Overflow
  My task is to open an existing audio file with the mka extension (Matroska container) and extract the raw audio data. If the audio data is different from pcm_alaw, then convert it to pcm_alaw before saving it to another file ( or buffer). This example shows only an example of extracting raw data from an mp2 file. I do not know how to do this with the mka container. I would like to have something like this: UPD I found an option to save audio data in the format in which it was recorded in the audio file. An example is shown below. PS. This is only a test version and most (...) -- Matroska, This
• 01:39
  Linking against ffmpeg libs on Rust gives `vdp_device_create_x11` (libvdpau-dev missing?) - Guerlando OCs Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to link against ffmpeg libraries, in rust, and getting as the only error: undefined reference to `vdp_device_create_x11' Here's the libs linked: fn main() println!("cargo:rerun-if-changed=build.rs"); println!("cargo:rustc-link-lib=static=z"); println!("cargo:rustc-link-lib=dylib=dl"); println!("cargo:rustc-link-lib=static=X11"); println!("cargo:rustc-link-lib=dylib=vdpau"); println!("cargo:rustc-link-lib=dylib=va"); println!("cargo:rustc-link-lib=dylib=va-drm");  (...) -- https://ffmpeg.org/doxygen/trunk/hwcontext__vdpau_8c_source.html

29 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 19:38
  How to compare two images using ffmpeg? [closed] - user3559780 Newest 'ffmpeg' Questions - Stack Overflow
  I am newbie in ffmpeg and want to compare 2 images (image1 and image2) and find out the percentage similarity between them with the help of ffmpeg. If the percentage is above certain threshold level, I will print the alert message. Is there any way using ffmpeg? image1 link https://ibb.co/dPQBJG9 image 2 link https://ibb.co/tP2gphs -- https://ibb.co/dPQBJG9, https://ibb.co/tP2gphs
• 23:28
  how to extract audio from video using ffmpeg c++ - daenerys Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to write c++ code on how to extract audio from mp4 format file. I have compiled the examples in ffmpeg library and tried to run the demuxing_decoding.c file. The problem is that on running the code, it starts to decode way more than the actual file size and decodes wrong codec format (the decoded files cant be run). here is the demuxing_decoding.c that I am trying to run: #include #include #include #include #include #include #include #include #define INBUF_SIZE 4096 #define AUDIO_INBUF_SIZE (...)
• 22:44
  How to extract H264 video from RTP packets in a .pcap file - Ke Chen Newest 'ffmpeg' Questions - Stack Overflow
  I am using FFmpeg to transmit RTP stream of a video and then capture and save all packets using WireShark into a .pcap file. The FFmpeg command I am using is: ffmpeg -i video.264 -r 25 -video_size 352x288 -c:v libx264 -f rtp rtp://127.0.0.1:1234 Now, I want to convert back to video using this pcap file. Can FFmpeg do this? or Is there other tools available? Also, I want to test how packet loss affects the quality of video. So I need to drop several packets in the pcap and then convert back to video to see the effect. Can I get the video back just use the rest of the (...)
• 22:26
  How to record an HTML animation and save it as a video, in an automated manner in the backend - frizurd Newest 'ffmpeg' Questions - Stack Overflow
  I need to record a webpage and save it as a video, in an automated manner, without human interaction. I am creating a NodeJS app that generates MP4 videos on the request of the user. The user provides an MP3 file, the app generates animated waveforms for the sound file on top of an illustration. What I came up with so far is a system that opens a generated web page in the backend, plays the audio file, and shows audio visualization for the audio file on an HTML canvas element. On top of another canvas with mainly static components, such as images, that do not animate. (...) -- ccapture.js
• 21:51
  Create different qaulities for my manifest with only mp4box - Ted Bed Newest 'ffmpeg' Questions - Stack Overflow
  I asked a question on slack on why the quality and bitrate of my dash video wasn't changing and I got this response: You only have one quality in your manifest. there is no way for the player to choose a different one So how can I create different "qualities"? I have a mp4box command like: MP4Box -dash 2000 -profile dashavc264:live -bs-switching multi -url-template whatever.mp4#trackID=1:id=vid0:role=vid0 whatever.mp4#trackID=2:id=aud0:role=aud0 -out whatever.mpd Would it be possible to create different "qualities" with only mp4box or would I have to create (...)
• 21:50
  YouTube Live not working with FFMPEG - Benedikt Neumayr Newest 'ffmpeg' Questions - Stack Overflow
  EDIT: It already works. My new router seems to block rtmp traffic. I edited the firewall config and now it works! I'm trying to stream to YouTube with ffmpeg with the following command: ffmpeg -f alsa -ac 2 -i hw:0,0 -f v4l2 -s 1280x720 -r 10 -i /dev/video0 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -strict experimental -r 25 -g 20 -b:v 2500k -codec:a libmp3lame -ar 44100 -b:a 11025 -bufsize 512k -f flv rtmp://a.rtmp.youtube.com/live2/45ee-qka9-0djm-796z My ffmpeg version 2.8.11 on Linux Mint 18.2 then says: Input #0, alsa, from (...) -- https://gist.github.com/laurenarcher/4644aacef51e734d33d5
• 20:55
  FFMPEG fails while processing MOV files - Tom Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to convert video files to DASH format. All videos work great except MOV videos. I'm using the following command: /usr/local/bin/ffmpeg -y -i /path/to/mov/video.mov -c:v libx264 -c:a aac -bf 1 -keyint_min 25 -g 250 -sc_threshold 40 -use_timeline 1 -use_template 1 -init_seg_name 'video_init_$RepresentationID$.$ext$' -media_seg_name 'video_chunk_$RepresentationID$_$Number%05d$.$ext$' -seg_duration 10 -hls_playlist 0 -f dash -adaptation_sets -0:s -map 0 -s:v:0 854x480 -b:v:0 750k -strict -2 -threads 12 /output/path/video.mpd I get (...)
• 19:55
  Joining audio file and all frame picture to video format with Python ffmpeg - muh.widad Newest 'ffmpeg' Questions - Stack Overflow
  i have a tmp directory which contains a collection of image frames and audio files. i am using linux mint 19.3 and python3.8. in the terminal I type ffmpeg -i tmp/%d.png -vcodec png tmp/output.mov -y and ffmpeg -i tmp/output.mov -i tmp/audio.mp3 -codec copy output.mov -y then the collection of images and audio in the directory will become a complete video. that I asked when I run it in python using the syntax call(["ffmpeg", "-i", "tmp/%d.png" , "-vcodec", "png", "tmp/output.mov", "-y"],stdout=open(os.devnull, "w"), stderr=STDOUT) and call(["ffmpeg", "-i", (...)
• 18:41
  How to handle and transcode multiple streams in one VM - Andrew Alvarez Newest 'ffmpeg' Questions - Stack Overflow
  I'm using the Arut's RTMP module to transcode an rtmp stream to hls, I'd like to know if I can receive two or more streams into my ingest URL and transcode them simultaneously. my application runs an ffmpeg command like this: application myapp live on; exec ffmpeg command tyvm
• 18:06
  .bat script: loop over files and save command to variable - Rolf vd H Newest 'ffmpeg' Questions - Stack Overflow
  Gooddday, I want to shorten a folder of movies to cut the last part of it. To do that I use ffmpeg & ffprobe. The time to be cut off is 5.52 seconds. If I want to do that, first I have to get the time of the movie and then (the second command in the loop), I have to subtract the 5.52 seconds. For now I have the following but I can't get it right: mkdir outputsss for %%a in ("FOLDER\\*.mp4") do ( ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "FOLDER\\%%~na.mp4" ffmpeg -i "FOLDER\\%%~na.mp4" -t 18.6 -c copy (...)
• 17:34
  How do I use ffmpeg to put HTML text overlay in a video? [closed] - Tom Newest 'ffmpeg' Questions - Stack Overflow
  How do I use ffmpeg to put HTML text overlay in a video? I have a web page where a user can write html text with online editor tool. I want to overlay the html text to a video. What can I do? Here is a sample HTML text. Best Wishes for a joyful and prosperous New Year!
• 17:32
  GStreamer vs FFmpeg - user1129474 Newest 'ffmpeg' Questions - Stack Overflow
  I try to record a Video with the OpenCV Framework an would like to save that into an Matroska(mkv) Container together with some additional data streams. First I thought using FFmpeg is the way that. But while looking into the OpenCV Sourcecode and searching in the web I found GStreamer. Because the documentation in GStreamer is much better than the FFmpeg documentation I would prefer using this Framework. In my understanding GStreamer is primarily used for Streaming, but could also rncode and mux video data. Is there any disadvantage when using (...)
• 17:24
  FFMPEG X264 reduce bitrate for unchanging input - GroovyDotCom Newest 'ffmpeg' Questions - Stack Overflow
  ffmpeg -f lavfi -i smptebars=duration=1000:size=640x360:rate=30 -preset ultrafast -vcodec libx264 -tune zerolatency -b 900k -g 1000 -f mpegts udp://127.0.0.1:1234 As can be seen when running this command, the encode size continues to grow rapidly even though: The input source never changes. It is exactly the same image again and again. The encoder has been told to insert a keyframe only once every 1000 frames Is there some configuration option I could add to change this behaviour? I can understand it would need to send an empty frame but right now it seems (...)
• 16:06
  Getting "OSError: [Errno 32] Broken pipe" while saving a numpy array using imageio.mimwrite into io.BytesIO() object - green_hunter434 Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to save a numpy array (array of frames) as a video using imageio.mimwrite . Operation like this works fine - imageio.mimwrite('./temp4.mp4', frames, fps=fps, format='.mp4') But, when I try something like this - fo = io.BytesIO() imageio.mimwrite(fo, frames, fps=fps, format='.mp4') OR writer = imageio.get_writer(fo, fps=fps, format='.mp4') for im in frames: writer.append_data(imageio.imread(im)) writer.close() I get the following error (...)
• 08:47
  how to increase bitrates of video which has been created through FFMPEG library in PHP? [closed] - Raindrops Info-tech Newest 'ffmpeg' Questions - Stack Overflow
  In one of our application, we are capturing the image and then we are giving facility to record audio up to 60 seconds, now we are merging an image with audio through FFMPEG library, with help of PHP, so as a final result we are getting mp4 video having bitrates of Do we have any solution on how to increase Bit rates, actually we have one image along with 60 seconds audio only? We had explored certain ways but fails to do so. Looking forward to your kind (...)
• 15:57
  FFMPEG RTSP Replace Video Stream with Holding Slide - Optimization - CPU Related - Majickal Newest 'ffmpeg' Questions - Stack Overflow
  c:\\bin\\ffmpeg\\bin\\ffmpeg.exe -rtsp_transport tcp -i rtsp://10.0.0.xx:8554/live -framerate 30 -loop 1 -i "C:\\bin\\slides\\HoldingSlide.png" -tune zerolatency -x264opts bitrate=2500:vbv-maxrate=2500:vbv-bufsize=250 -c:v libx264 -g 30 -keyint_min 30 -crf 35 -preset superfast -pix_fmt yuv420p -s 1280x720 -c:a aac -b:v 2500k -b:a 192k -ar 24k -map 0:1 -map 1:0 -f flv $INGEST_URL The above ffmpeg code replaces the rtsp video component of the rtsp stream with a holding slide. I am seeing high CPU utilization (from the re-streaming server) when running this code and am looking for (...) --
• 15:28
  Trim video with ffmpeg is very slow - mdkamrul Newest 'ffmpeg' Questions - Stack Overflow
  I wanted to trim video with ffmpeg worker mp4 but this going very slow during the process the video here is my command for this ["-y", "-i", "video.mp4", "-ss", "00:00", "-to", "00:07", "output.mp4"] the video is trimming but with very slow and not working with mobile device showing memory allocation error. please help me for this
• 15:27
  Extract frames from video FFMPEG with frameskip and name it accordingly.\\ - jafar ali Newest 'ffmpeg' Questions - Stack Overflow
  I would like to extract every 5th frame from a video and rename it accordingly. frame_0000.jpg frame_0005.jpg frame_0010.jpg frame_0015.jpg Are there any parameters in the ffmpeg command other than the framerate and FPS to do so. Current command generates output sequentially. ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
• 12:32
  Add ffmpeg gpl to yocto - ErniBrown Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to compile a GPL/LGPL version of ffmpeg and add it to a yocto image? I always get a message about LICENSE_FLAGS_WHITELIST, but I do not want to enable the commercial licenses. In the recipe there is this line: PACKAGECONFIG[gpl] = "--enable-gpl,--disable-gpl" Is it meant to enable gpl build of ffmpeg?
• 12:28
  Adding Watermark/Text in Videos in Java - Aditya Kumar Newest 'ffmpeg' Questions - Stack Overflow
  I am looking for adding texts and watermarks in video files (in java) using the libraries. The texts/Watermark can be single line/multi-line and at different intervals. I didn't find any open source tool or java library which helps me to achieve the goal.
• 11:51
  PHP add whitespaces in string with an URL - Alberto Valerio Newest 'ffmpeg' Questions - Stack Overflow
  Problem I have a temporary url to access an object from AWS-S3 $source = "http://mybucket..."; If I do a var_dump($source) it shows me the correct URL string(407) "https://mybucket.s3.amazonaws.com/storage/..." So I try to use this url in a ffmpeg command in this way (double quotes are required in ffmpeg) $cmd = 'ffmpeg -i "' . $source . '" ... shell_exec($cmd); This do not work, and when I do a var_dump($cmd) the url shows like this (whitespace beetween https: and the // ) "https: (...)
• 11:46
  Synchronize RTP audio and video stream - Pittie Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to synchronize audio and video streams but the output audio stream seems to be 1 second ahead from the video stream. sender: ffmpeg -re -fflags +igndts -fflags +genpts -i input.mp4 -b:v 1200k -r 30 -c:v libx264 -an -sdp_file test.sdp -f rtp rtp://localhost:8036 -fflags +igndts -fflags +genpts -c:a copy -vn -f rtp rtp://localhost:8038 receiver: ffmpeg -c:v h264 -i test.sdp -filter_complex "[0:v] setpts='(RTCTIME - RTCSTART) / (TB * 1000000)' [v1]; [0:a] asetpts='(RTCTIME - RTCSTART) / (TB * 1000000)' [a0]" -map (...)
• 10:51
  Correct usage of thread_queue_size in ffmpeg - Alf Newest 'ffmpeg' Questions - Stack Overflow
  I am doing a screencast where I am recording what is going on at my screen together with simultaneous audio comments from an external USB microphone. I am using the following command: ffmpeg -f x11grab -r 25 -s 1280x720 -i :0.0+320,236 -thread_queue_size 1024 -f alsa -thread_queue_size 1024 -i hw:1 -vcodec huffyuv screencast.mkv I thought that using such high values for thread_queue_size should put me on the safe site to avoid any buffer xrun errors which I had previously. However, this seems not to be the case. Here is the warning message which appeared (...)
• 10:12
  Do avcodec_receive_frame and avcodec_send_packet block / how to design ffmpeg decoding loop? - Paprika Newest 'ffmpeg' Questions - Stack Overflow
  I'm thinking about how to design a loop that reads frames from internet, feed to ffmpeg decoder and then receive from ffmpeg to send to a render. Take this pseudocode loop in consideration: while true auto packet = receive_packet_from_network(); avcodec_send_packet(packet); auto frame = alloc_empty_frame(); int r = avcodec_receive_frame(&frame); if (r==0) send_to_render(frame); do avcodec_send_packet or avcodec_receive_frame block or ffmpeg has an internal thread? I'm concerned about this loop because it waits for (...)
• 09:27
  FFMPEG Debug "Invalid data found when processing input" - dgcipp Newest 'ffmpeg' Questions - Stack Overflow
  How can I debug this error? I am trying to display a vp8-encoded video stream (TCP) from Android (x86) to my PC but I got this message from ffplay: "tcp://10.8.0.3:49152? listen: Invalid data found when processing input" With h264 it works and the same code in an android device works with vp8 too. Command in the server: ffplay -i tcp://10.8.0.3:49152?listen I have tried adding verbosity or log-level debug, but it shows the same. How can I get a detailed error?  (...) --
• 08:52
  How to create a video from a series of images with varying image durations? - user1354557 Newest 'ffmpeg' Questions - Stack Overflow
  I'd like to programmatically create a video file that is composed of a series of images. However, I'd also like to be able to specify a duration for each image. I often see ffmpeg examples suggested for similar tasks, but they always assume the same duration for each image. Is there an efficient way to accomplish this? (An inefficient solution might be setting the frame rate to something high and repeatedly copying each image until it matches the intended duration) I will be dynamically generating each of the images as well, so if there is way to encode the image data (...) -- ffmpeg examples
• 08:43
  ffmpeg raw video and audio stdin - Adria Ciurana Newest 'ffmpeg' Questions - Stack Overflow
  Currently, I am using ffmpeg to start from frames in raw format to generate a video output that is broadcast in OBS. The problem is that we want to add an audio track to it, that is: each frame will now have its matrix of pixels and its audio. I don't know exactly how to make ffmpeg take this composite signal or what the best methodology is. Actually I use the stdin of the ffmpeg. I use this code to generate it: url = "udp://" + udp_address + ":" + str(udp_port) command = [ 'ffmpeg', '-loglevel',  (...)
• 07:40
  Android: Pass video path to FFmpeg - marian Newest 'ffmpeg' Questions - Stack Overflow
  I have developed an app that play video from gallery. I would like to add watermark using FFmpeg command in the video selected. But I do not know how to pass the path to the FFmpeg command. I could not find proper tutorials or reference regarding this. My coding are as follows: MainActivity.java: public class MainActivity extends Activity public ProgressDialog progressBar; String workFolder = null; String demoVideoFolder = null; String demoVideoPath = null; String vkLogPath = null; LoadJNI vk; private final int STOP_TRANSCODING_MSG = (...)
• 04:32
  How do you merge an audio mp4 and video mp4 with ffmpeg in python 3? - myth0s Newest 'ffmpeg' Questions - Stack Overflow
  I'm creating a script in python, that at one point needs to take two files, an audio mp4 file and video mp4 file, and merge them together. They are both of the same length, and the video file matches with the audio file. However, I can't seem to get them to merge. I first tried: input_video = ffmpeg.input(onlyVidPath + "/" + inputVidTitle + ".mp4") input_audio = ffmpeg.input(audioPath + "/" + inputAudTitle + ".mp4") fullOut = ffmpeg.output(input_video, input_audio, vidPath, f='mp4', vcodec='copy', (...)
• 03:42
  How can I use a FFmpeg filter with discord-music-system? [closed] - Michał Letkiewicz Newest 'ffmpeg' Questions - Stack Overflow
  I created and modified discord-music-system on NPM a bit, and I wanted to use the apulsator FFmpeg filter on the output. Is this possible? -- discord-music-system, apulsator FFmpeg filter
• 03:44
  using for loop in powershell with ffmpeg to create thumbnails - blue Newest 'ffmpeg' Questions - Stack Overflow
  I have this basic for loop combined with ffmpeg that creates thumbnails for each video. Could anyone help me figure out why it doesn't work? I don't really know much about powsershell. If i were to use a regular array it works but when i use a pre-sized array it does not. EDIT : somehow figured it out, i should have included the extention'.png' in the array instead of adding at the end of the for loop.i also didn't define a size for the array. $files = ⓐ(Get-ChildItem -Path 'D:\\other stuff\\ffmpeg test\\*.mp4') $filetext = (...)
• 00:40
  ffmpeg - avformat_alloc_context error in linker - ld: symbol(s) not found for architecture x86_64 - building on Mac [duplicate] - QRrabbit Newest 'ffmpeg' Questions - Stack Overflow
  I'm writing my first program - attempt at avformat libraries inside my C++ code. Linker errors on this line: AVFormatContext* av_format_ctx = avformat_alloc_context(); The error appears as such: Undefined symbols for architecture x86_64: "_avformat_alloc_context", referenced from: load_frame(char const*, int*, int*, unsigned char**) in load_frame.cpp.o "_avformat_open_input", referenced from: load_frame(char const*, int*, int*, unsigned char**) in load_frame.cpp.o ld: symbol(s) not found for architecture x86_64 Almost (...)
• 00:09
  FFmpeg: building example C codes - J. S. Newest 'ffmpeg' Questions - Stack Overflow
  I have configured and compiled the FFmpeg library using this link: https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu Now, I am trying to build example C codes provided by FFmpeg from here: https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples However, when I run make install-examples or make install (suggested by /example/README), I receive this kind of message: make: *** No rule to make target '/doc/examples/README', needed by 'install-examples'. Stop. I thought this may be due to the rules not (...) -- https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu, https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples

28 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 23:41
  html text overlay with ffmpeg [closed] - Tom Newest 'ffmpeg' Questions - Stack Overflow
  I have a web page where a user can write html text with online editor tool, ckeditor.com. I want to overlay the html text to a video. My understanding is that ffmpeg doesn't support text overlay with html. Here are some possible options. I haven't tried any of them. I want to find out which is the better way to doing it. Parse the html text and convert it to text and settings that ffmpeg supports? Is it doable? How difficult is this? Use puppeteer (server side rendering) to create a png image for image overlay. Would the font rendering on the server side (...)
• 23:52
  node-ffmpeg: Use URL instead of local file - Komali Newest 'ffmpeg' Questions - Stack Overflow
  I am making something with Discord.js and ffmpeg. I need to get the ffmpeg info from a remote file, but it keeps returning the error Input file does not exist. Here is the basis of my code (trimmed down): const ffprobe = require('ffprobe'), ffprobeStatic = require('ffprobe-static'); const ffmpeg = require("ffmpeg") exports.run = (client, message, file, Discord) => const timeReactions = ["◀️", "▶️", "⬅️", "➡️", (...)
• 23:11
  Laravel FFMpeg - FFMpeg cannot edit existing files in-place - wlaskovic Newest 'ffmpeg' Questions - Stack Overflow
  After I wanted to upload a video in the queue was returned a failed job. [2020-09-25 13:24:25][125] Processing: App\\Jobs\\ConvertVideoForStreaming [2020-09-25 13:24:26][125] Failed: App\\Jobs\\ConvertVideoForStreaming So I've took from the DB failed_jobs table the response and run the following: C:\\ffmpeg\\bin\\ffmpeg.exe -y -i "C:\\wamp64\\www\\laravel-stream\\storage\\app/public\\WF3UL8fJTSE7BMxa.mp4" -threads 12 -vcodec libx264 -acodec libmp3lame -b:v 500k -refs 6 -coder 1 -sc_threshold 40 -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 (...)
• 23:00
  need help using ffmpeg to "concat" multiple audio files (webm, mp4) to make one longer MP3 of audio - djturbojp7 Newest 'ffmpeg' Questions - Stack Overflow
  I have done some searching (for several hours) and tried to manipulate many examples to work for me, but I still keep coming up empty here. I am using linux-mint 19, with ffmpeg installed. I have a folder with several audio files. The majority of these are "webm" (with no video) and there are a few "m4a". I am trying to make one long mp3 file from the audio in all of these strung together from start to finish. Lets say for sake of argument, my directory has the following files: audio file a.webm audio file b.webm audio file c.m4a audio file d.webm I (...) -- https://trac.ffmpeg.org/wiki/Concatenate
• 21:59
  FFmpeg slideshow concat outputs only the last image - Kinlec Newest 'ffmpeg' Questions - Stack Overflow
  I'am trying to produce image slideshow by ffmpeg concat. The problem is that the output video only plays the last image from my input file with images. The input: file '/var/www/html/docroot/types/video/images/img0.jpg' duration 10 file '/var/www/html/docroot/types/video/images/img1.jpg' duration 10 file '/var/www/html/docroot/types/video/images/img2.jpg' duration 10 The command: ffmpeg -y -r 1/10 -f concat -safe 0 -i /var/www/html/docroot/types/video/info.txt -c:v libx264 -vf (...) -- GIF
• 21:33
  How to create a powershell script / or windows .bat file for ffmpeg - WorldTeacher Newest 'ffmpeg' Questions - Stack Overflow
  So, I want to create a Powershell or Batch file (whichever works best for the task), that I can paste in a folder and after executing it, will start to use FFmpeg to encode all videos The part that works (in .bat): for %%a in ("*.mkv") do( ffmpeg -i "%%a" -c:v libx265 -c:a copy -x265-params crf=25 "%%a [encoded].mkv" pause) This works, but in some folders, I already have [encoded] files. I'd like for the script to skip these files. I asked in reddit and received the following script: for %%a in ("*.mkv") do ( if not exist "%%a [encoded].mkv" (...)
• 20:57
  Processing Frames of Screen Recording in Node Usin FFMPEG - The42ndTurtle Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to capture my screen using Node.JS and FFMPEG, and I have gotten as far as saving an flv file, but I am unable to process the frames real-time. My code so far is const ffmpeg = require('ffmpeg-static'); const spawn = require('child_process'); const createWriteStream = require('fs'); const canvas = document.querySelector('#canvas'); const ctx = canvas.getContext('2d'); const process = spawn( ffmpeg, ["-f", "gdigrab", "-framerate", "30", "-i", "desktop", '-crf', (...)
• 20:39
  PHP - Actively refresh exec function result? - ItzArty_ Newest 'ffmpeg' Questions - Stack Overflow
  Im unexperienced in this way of using PHP, but Id like to like, create some variable for example $test, which would be exec("ffmpeg ...") as we know, ffmpeg does actively change its result, while PHP just waits till the command is finished, is there an option, that I would execute the command and by refreshing the page get active form of the result, since Id like to make a progress bar and things, but that seems to be impossible to me right now. I have tried basic things, but as I see, I have no idea how to do, it any suggestions how to make that? Please just do not close this, it is (...)
• 20:13
  FFMPEG split video to segments with audio - Kiril Mytsykov Newest 'ffmpeg' Questions - Stack Overflow
  I'm tying to split mov file to .ts segments with m3u8 playlist. All is ok except of audio. Audio doesn't work and it seems that ffmpeg ignores audio stream. This is my command: ffmpeg -i stepteen2.mov -c:a aac -c:v libx264 -an -map 0 -muxdelay 0 -muxpreload 0 -output_ts_offset 0 -segment_time 2 -segment_wrap 1000 -segment_list_size 0 -segment_list temp.m3u8 -segment_list_flags +cache -segment_list_type m3u8 -f segment temp-%03d.ts After this command I receive 5 (...)
• 17:02
  How to record screen using ffmpeg [closed] - Nikto Newest 'ffmpeg' Questions - Stack Overflow
  ffmpeg -y -rtbufsize 200M -f gdigrab -thread_queue_size 1024 -probesize 10M -r 10 -draw_mouse 1 -video_size 1920x1080 -i desktop -f dshow -channel_layout stereo -thread_queue_size 1024 -i audio="Stereo mix (Realtek High Definition Audio)" -f dshow -channel_layout stereo -thread_queue_size 1024 -i audio="Microphone (Realtek High Definition Audio)" -c:v libx264 -r 10 -preset ultrafast -tune zerolatency -crf 25 -pix_fmt yuv420p -c:a aac -strict -2 -ac 2 -b:a 128k -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" recording.mp4 Sup! That's my command. I have a few questions. Is my (...)
• 07:18
  Mac webcam - get the device [closed] - michael Newest 'ffmpeg' Questions - Stack Overflow
  How do I access my default video camera on my mac? I know on Linux it is /dev/video0 but my Mac does not have that. I'm trying to capture my webcam into ffmpeg ffmpeg -i /dev/video0 But it won't work because /dev/video0 doesn't exist.
• 19:51
  Split filiename with ffmpeg and reverse order - sobo Newest 'ffmpeg' Questions - Stack Overflow
  I reverse video files in a batch using ffmpeg. What I would like to do now is: Reverse only the files with a "-" in the name. Rename these files by swapping the part before "-" with the part after it. Like "abc-def" becomes "def-abc". Any ideas? Thanks! UPDATE: Sorry for the wrong title/topic. Am I supposed to create a new post? Or edit the title? I tried the following now to find the files. For some reason it always succeeds, no matter which name: for %%a in ("videos/*.mp4") do ( echo %%a|find "-" >nul if %errorlevel%==0 (...)
• 19:21
  Video streaming to YouTube using JavaScript and Java - user1597121 Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to stream live video from a user's browser to YouTube Live. I already have the following working: Capture video from the webcam using navigator.mediaDevices.getUserMedia Send video data to the server via WebSocket by periodically invoking this function: function getFrame(video) var canvas = document.createElement('canvas'); canvas.width = video.videoWidth; canvas.height = video.videoHeight; canvas.getContext('2d').drawImage(video, 0, 0); return canvas.toDataURL('image/png', (...)
• 19:16
  GStreamer H264 stream to HTML5 webpage - LostInTheEcho Newest 'ffmpeg' Questions - Stack Overflow
  I have a Linux board with a camera connected to it that is recording whatever goes on to a mp4 file(s) on the SD card of the board. I'm using gstreamer which connects to the /dev/video1 source and uses H264 encoding. I run it with a command similar to this one: gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-h264,width=640,height=480,framerate=30/1 ! h264parse ! rtph264pay ! udpsink host=host port=port The upper part works fine and records everything locally, but I'd also like to stream this video to a HTML5 webpage, which is meant to change camera options and (...)
• 18:02
  ffmpeg single quote in drawtext - dotsam Newest 'ffmpeg' Questions - Stack Overflow
  I haven't been able to get ffmpeg's drawtext video filter to draw apostrophes/single quotes when they are in drawtext's "text=" parameter, even when I escape them. Double quotes work fine, and apostrophes in text loaded from a file (e.g. textfile="example.txt") work fine. Is this a bug? e.g. ffmpeg -i test.mpg -vf drawtext="apostrophes don't print" ... ffmpeg -i test.mpg -vf drawtext="even when they\\'re escaped" (...)
• 17:33
  FFMPEG Output Stream via UDP with big Lags - hammeroflight Newest 'ffmpeg' Questions - Stack Overflow
  I have a problem in solving a stable yet delayed video output stream. I have the following code to receive video from a camera operating over UDP whose address is mentioned in the code. import cv2 import threading import queue import time q = queue.Queue() def recieve(): cap = cv2.VideoCapture('udp://ⓐ0.0.0.0:11111?buffer_size=65535&pkt_size=188') ret, frame = cap.read() q.put(frame) while ret: ret, frame = cap.read() q.put(frame) def display(): while True: if q.empty() != True:  (...)
• 16:49
  How to merge video and photo with alpha channel in Python? - Daniel Kunin Newest 'ffmpeg' Questions - Stack Overflow
  So, i.e. I have 1 video with alpha channel (overlay) and I want to merge it with a .png or .jpg file Does anyone know a tool/lib which can do that? Maybe ffmpeg? I would be really happy if you shared an implementation of merging alpha channel video with image here
• 16:42
  Electron and NodeJS: Execute shell command asyncronously with live stream - Bruno Freire Newest 'ffmpeg' Questions - Stack Overflow
  Electron: get file conversion percent in real-time: I wanna run the command ffmpeg -i video.mp4 (example) to convert a video into another format. But I want to get the conversion percent that is streamed in the process output and get it in my Electron App or NodeJS. I've tried all methods: spawn fork exec and all of them return me the last line of the process output. I want a LIVE Stream of each line that is been written, to show the percent progress. I've tried: Fork const fork = require('child_process') const forked = fork('ffmpeg -i (...)
• 16:41
  MPEG4 videos cannot be played on iOS14 (AVPlayer issue) - vanste25 Newest 'ffmpeg' Questions - Stack Overflow
  I have a piece of code that uses ffmpeg with default mpeg4 codec to merge multiple videos and audio songs. ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "concat=n=2:v=1:a=1" -f MOV -vn -y output.mp4 Everything worked on iOS13 and after the update to iOS14, videos are black and cannot be played by any player. Sound is there and it's good. I tried to switch to h264 and it works good, but as you already know, h264 is under GPL and it is expensive and requires code to be open sourced which is not acceptable for me. None of the mpeg4 videos can be played in (...)
• 16:09
  Debugging Gstreamer pipeline with tee and a filesink in C - NicolasBourbaki Newest 'ffmpeg' Questions - Stack Overflow
  There is an excellent example on how to construct a C program using GStreamer and its tee and filesink elements on https://gist.github.com/crearo/a49a8805857f1237c401be14ba6d3b03. (Another one can be found on https://gstreamer.freedesktop.org/documentation/tutorials/basic/multithreading-and-pad-availability.html?gi-language=c). The idea of the tee element in a pipeline is similar like the tee program in Unix: Like a T-shaped tube, it allows to add a bifurcation to a pipeline, which is in my case used to display a video stream to the screen (which works perfectly) and writing it (...) -- https://gist.github.com/crearo/a49a8805857f1237c401be14ba6d3b03, https://gstreamer.freedesktop.org/documentation/tutorials/basic/multithreading-and-pad-availability.html?gi-language=c
• 15:52
  Videos encoded by FFMPEG (mpeg codec) cannot be played on iOS14 - vanste25 Newest 'ffmpeg' Questions - Stack Overflow
  I have a piece of code that uses ffmpeg with default mpeg codec to merge multiple videos and audio songs. ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "concat=n=2:v=1:a=1" -f MOV -vn -y output.mp4 Everything worked on iOS13 and after the update to iOS14, videos are black and cannot be played by any player. Sound is there and it's good. I tried to switch to h264 and it works good, but as you already know, h264 is under GPL and it is expensive and requires code to be open sourced which is not acceptable for me. What was changed? Anything in release (...)
• 14:56
  Is there a way to force ffmpeg produce an I frame while encoding a mjpeg stream to h264 - SolskGaer Newest 'ffmpeg' Questions - Stack Overflow
  I am transcoding a mjpeg stream to a h264 one, and I hope the stream can be played anytime I put it to a player, as far as I know, I need an I-frame the time I connect to it to play the stream properly, is it possible? By the way, I invoke the ffmpeg binary using golang so I have full control of its input.
• 14:52
  When is an HLS stream ready for playback? - J. Hesters Newest 'ffmpeg' Questions - Stack Overflow
  I'm building a video application where a stream is recorded by FFMPEG. It sends out chunks to an origin server. I need to trigger an active webhook when the stream is ready to be consumed. I tried scanning the chunks for the first appearance of the master playlist: [hls ⓐ 0x5561875dcec0] Opening 'https://origin-server.com/hls/68855940-5b45-4b89-aaa6-3966f6ffdced/ls-master.m3u8.key' for writing but this seems unsufficient. I basically need to know "a live hls stream is considered ready when X". I wonder what condition would signify this (...)
• 12:57
  creating thumbnails from multiple videos - blue Newest 'ffmpeg' Questions - Stack Overflow
  I have multiple videos, and i want to create a thumbnail image for each video.i also want the image thumbnails to have the same names as the videos and have specific width/height. Is it also possible to have ffmpeg create thumbnails with a specific aspect ratio and instead of stretching the video it could add black bars? Now i don't know a thing about how ffmpeg works so i looked up a tutorial online and configured it,tested out a simple script and it worked. i found what the script i was looking for but i don't know a thing about bash scripts so it just throws an (...)
• 12:43
  Extremely slow ffmpeg/sws_scale() - only on heavy duty - user2328447 Newest 'ffmpeg' Questions - Stack Overflow
  I am writing a video player using ffmpeg (Windows only, Visual Studio 2015, 64 bit compile). With common videos (up to 4K ⓐ 30FPS), it works pretty good. But with my maximum target - 4K ⓐ 60FPS, it fails. Decoding still is fast enough, but when it comes to YUV/BGRA conversion it is simply not fast enough, even though it's done in 16 threads (one thread per frame on a 16/32 core machine). So as a first countermeasure I skipped the conversion of some frames and got a stable frame rate of ~40 that way. Comparing the two versions in Concurrency Visualizer, I found a (...) -- ,
• 12:19
  FFmpeg and choice right windows configuration- CPU, memory and GPU - ekvador Newest 'ffmpeg' Questions - Stack Overflow
  I have windows PC, 16 gb memory, intel i7 920/ 2.67 GHz and on this machine running several apps, and ffmpeg for converting videos, it is usage for one day: CPU and memory usage When ffmpeg working , usage for CPU is 100, it working about 1,5 hour by day . Question is, what FFmpeg using for work is this CPU only or and GPU, if I want to increase FFmpeg jobs , do I need stronger PC ? thanks -- CPU and memory usage
• 12:10
  FFMPEG with -vf yadif on progressive file produces incorrect 'Original Frame Rate' metadata double - hedgehog90 Newest 'ffmpeg' Questions - Stack Overflow
  I've got an ffmpeg command that I often use, I incorporate the yadif argument for content that may or may not be interlaced: ffmpeg -i input.mkv -c copy -c:v hevc_nvenc -c:a:0 aac -b:a 192k -vf yadif=mode=1:deint=1 output.mkv This means if input.mkv is an interlaced video, I get double the frame rate and the footage is deinterlaced, and if it's progressive it remains so and the frame rate doesn't change, exactly as I want it. However, I've just noticed in Mediainfo that progressive videos processed by this command, it adds this mysterious "Original Frame (...) --
• 11:57
  What does the size used in ffmpeg logging indicate? - Jop Knoppers Newest 'ffmpeg' Questions - Stack Overflow
  I am using FFmpeg to read a RTSP stream. FFmpeg sometimes gives a error message 'Past duration x.xx to large' including the following data in the logging: frame=174635061 fps=24 q=-0.0 size=875425493kB time=312:09:56.45 bitrate=32350.1kbits/s dup=3424 drop=5 In my case 'size' is huge, I would like to understand what 'size' is indicating. I have not been able to find a answer in the documentation at http://ffmpeg.org/documentation.html FFmpeg version: (...) -- http://ffmpeg.org/documentation.html
• 11:14
  Specifying input duration of .aac with ffmpeg - Jademalo Newest 'ffmpeg' Questions - Stack Overflow
  I had an error with an mp4 recording, and after recovering the video and audio streams I've still got an issue. The aac audio file is 160kb/s CBR. However, ffmpeg returns this when trying to work with it; [aac ⓐ 000001187e6944c0] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from 'result.aac': Duration: 00:38:41.01, bitrate: 174 kb/s Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 174 kb/s That duration and bitrate is totally wrong. It should be ~42 minutes long, and it definitely has a bitrate of 160 kb/s.  (...)
• 09:57
  ffmpeg-python crossfade transition for unknown number of photos - Saya Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert a bunch of photos into a video with crossfade between them. The number of photos I am converting is variable I am using the code from HERE to apply the crossfade: Since the number of photos are variable I looped over all the photos in the directory and generated the -loop and also the second part ([0:v]fade=t=out:st=4:d=1[v0];): for i in range(os.listdir('photos')): if i == 0: text += f'\\n-loop 1 -t 60 -i photos/Imagei+1.jpg \\\\\\n' text2 = '\\n[0:v]fade=t=out:st=4:d=1[v0]; \\\\\\n' else: text (...)
• 04:41
  ffmpeg - how to pass all streams audio/tmcd, etc from input->output unchanged - QRrabbit Newest 'ffmpeg' Questions - Stack Overflow
  Please help me, with hopefully specific ffmpeg arguments to include in my video encoding. My work is only related to video stream, so this is the only one I'm changing. I receive a .mov file(s) that have already been pre-compiled for a specific broadcaster, some of those selfcontained videos have 4 streams (1 video, 2 audio, and some other timecode stream). Others have up to 17 streams: 1-video, 15-audio streams and the final one is unsupported tmcd. My process pipeline includes only re-encoding/re-processing video stream, and everything else I need to pass along to the (...)
• 00:58
  Cannot see RTP header in the captured packets when using FFmpeg for RTP video streaming - Ke Chen Newest 'ffmpeg' Questions - Stack Overflow
  I used FFmpeg to do RTP video streaming and then captured the packets using WireShark on loopback interface. The command is: ffmpeg -i video.264 -r 25 -video_size 352x288 -c:v libx264 -f rtp rtp://127.0.0.1:1234 All packets are captured by WireShark successfully but I cannot see the RTP infomation in these packets, only UDP screenshot. I have enabled rtp_udp protocol in wireshark screenshot. Is there any setting that I missed? -- screenshot, screenshot

27 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 21:49
  FFmpeg youtube streaming crash - UkaszYTPolak Newest 'ffmpeg' Questions - Stack Overflow
  I'm using vps with Ubuntu 18.04.1 LTS And i want to create stream 24/7 on youtube. Script: #! /bin/bash VBR="1500k" FPS="29" QUAL="ultrafast" YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2" YOUTUBE_KEY="xxxx-xxxx-xxxx-xxxx-xxxx" VIDEO_SOURCE="undefajnd.mp4" AUDIO_SOURCE="marynaura.mp3" AUDIO_ENCODER="aac" ffmpeg \\ -stream_loop -1 \\ -re \\ -r $FPS \\ -i "$VIDEO_SOURCE" \\ -thread_queue_size 512 \\ -i "$AUDIO_SOURCE" \\ -c:v libx264 -tune stillimage -pix_fmt yuv420p -preset $QUAL -r $FPS -g (...) -- Video - from terminal
• 20:58
  How do I redirect the output of SpeechSynthesizer to a Process of ffmpeg - TheOneAndOnlyMrX Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to have a SpeechSynthesizer generate some audio data, pipe it into a Process of FFmpeg, and have FFmpeg save the data to a file (output.wav). Eventually, the audio data will be used for something else, which is why I am using FFmpeg. using (MemoryStream voiceStream = new MemoryStream()) using (Process ffmpeg = new Process()) SpeechSynthesizer synth = new SpeechSynthesizer(); int samplesPerSecond = 48000; int bitsPerSample = 8; int channelCount = 2; int averageBytesPerSecond = samplesPerSecond * (bitsPerSample / 8) * (...) -- SpeechSynthesizer, Process
• 18:23
  No video steam played with the ffmpeg script from avi to mp4 on Centos 8.2/ffmpeg 8 [duplicate] - user27240 Newest 'ffmpeg' Questions - Stack Overflow
  The mp4 file that was transformed from the avi file with the script below running on Centos 8.2/ffmpeg gcc 8 does not play video stream and it only play audio on chrome/edge/firefox/opera and Windows10. Could anyone please help me out? for i in /var/www/html/xxxxx/xxxxx/479.AVI; do ffmpeg -i "$i" -pix_fmt yuv420p -movflags +faststart -ss 0.03 "/var/www/html/xxxxx/xxxxx/$(basename "$i" .avi).mp4"; done The log for the ffmpeg transform script: peg -i "$i" -pix_fmt yuv420p -movflags +faststart -ss 0.03 "/var/www/html/xxxxx/xxxxx/$(basename "$i" .avi).mp4"; (...)
• 03:26
  ffmpeg - maintain video quality as I apply multi-pass workflow, each includes decoding and encoding again, in video editing - QRrabbit Newest 'ffmpeg' Questions - Stack Overflow
  I'm using FFMPEG libraries do do some video manipulation, and due to complexity of filters and image overlaying, I have to run the process in multiple passes. This means, my process is as such: Open original video, decode it, run -complex_filter, recompress the video in whichever format the original video was encoded. Open the output from the first pass, run another -complex_filter, etc-etc. Sometimes I have to do the above 3-4 times. My concern is that the video, with every compression is losing quality - obvious signs of that is the file is shrinking in size with (...) -- 0,
• 19:19
  What steps are needed to stream RTSP from FFmpeg? - user1767754 Newest 'ffmpeg' Questions - Stack Overflow
  What steps are needed to stream RTSP from FFmpeg? Streaming UDP is not a problem, but as I want to stream to mobile devices which can natively read RTSP streams, I couldn't find any setup which tells what exactly is needed. Do I need an RTSP streaming server like LIVE555 or can I use FFmpeg only? My Command: ffmpeg -i space.mp4 -vcodec libx264 -tune zerolatency -crf 18 -f rtsp -muxdelay 0.1 rtsp://192.168.1.200:1234 I get an Input/Output error. Do I need a SDP description to use RTSP? And if yes where do I have to put (...)
• 19:19
  How to escape all special characters for ffmpeg drawtext filter in java - ezwrighter Newest 'ffmpeg' Questions - Stack Overflow
  Does anyone have a good recipe for escaping all of the special characters (',%,\\,:,,) from a String in java, that will be used in an ffmpeg drawtext filter chain? Trying to use replaceAll with different combinations of escaping has been an exercise in frustration! String myTextString = "Bob's special\\cool mix:stuff ⓐ 40% off"; Runtime.getRuntime().exec(new String[] "ffmpeg",...., "filter_complex", "drawtext=enable='between(t,0,10)':x=10:y=10:fontfile=Roboto-Black.ttf:text='" + myTextString + "':fontcolor=#a43ddb:fontsize=14", ... (...) -- https://ffmpeg.org/ffmpeg-filters.html#drawtext-1
• 18:45
  FFmpeg node js convert video file (.mp4) to m3u8 : Output format m3u8 is not available - Jérémy Gachon Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert videos files (like .mp4 or .avi) to .m3u8 in nodeJs. I tried to do that with ffmpeg and node-js, but that don't work : 'Output format m3u8 is not available'. Here is my nodeJs code : const ffmpegInstaller = require('ⓐffmpeg-installer/ffmpeg'); const ffmpeg = require('fluent-ffmpeg'); var cmd = ffmpeg('./flir_20191202T174341.mp4') .setFfmpegPath(ffmpegInstaller.path) .videoBitrate(1024) .videoCodec('divx') .format('m3u8') .on('end', () => // (...)
• 16:37
  Convert audio blob to mp3 on expressjs server - islalobo Newest 'ffmpeg' Questions - Stack Overflow
  I have a little app that captures sound and stores the audio as an audio blob encoded as base64 on an expressjs server. I would like to convert these audio files into .mp3 or .wav - any binary usable format. My understanding of audio files is very basic and I'm looking to gain a better understanding. Any guidance is appreciated. I've read through several posts and issues, but I'm just a bit lost right now. Here is my client-side capture of the audio, encoding and then posting to expressjs server. const saveMessage = async function(base64AudioMessage) await (...)
• 13:09
  ffmpeg - audio is 500ms behind video in screen recording - Riz Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to record my screen along with the audio using ffmpeg 4.3. But in the final output, my audio is around 500ms to 1sec behind the video. Why is this happening? How this can be fixed? Here is the command I am using on Windows 10 machine: ffmpeg.exe -threads 4 -rtbufsize 1024m -f dshow -i audio="Microphone (Realtek Audio)" -f gdigrab -offset_x 0 -offset_y 0 -video_size 1920x1080 -framerate 30 -probesize 32 -i desktop -pix_fmt yuv420p -c:v libx264 -crf 28 -preset ultrafast -tune zerolatency -movflags +faststart (...)
• 11:33
  FFMPEG - Store FFPROBE's duration output as a variable - user7032056 Newest 'ffmpeg' Questions - Stack Overflow
  I wanted to use a video's duration in the "enable='between(t,0,0)" field to make sure that I overlay an image at 1/3 of the video's duration every time. According to FFMPEG's info on their site, I need to use this ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 input.mp4 it does return a value but I can't seem to be able to set it to a usable variable, I already tried by using set duration=ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 (...)
• 11:08
  Audio Files downloaded from YouTube-DL are corrupted - Sushil Newest 'ffmpeg' Questions - Stack Overflow
  I have written a small piece of code that downloads audios and videos from YouTube using YouTube-DL. Here is my code: from __future__ import unicode_literals import youtube_dl link = input("Enter the video link:") while True: choice = input("Enter a for audio file, v for video file:") if choice == "a" or choice == "v": break ydl_opts = if choice == "a": ydl_opts = 'format': 'bestaudio/best', 'postprocessors': [ 'key': 'FFmpegExtractAudio',  (...)
• 09:57
  Error while saving a matplotlib animation, missing 'dpi' argument - aarcas Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to save an animation of matplotlib.animation.AnimationFunc and I get an error saying 'dpi' argument missing. Obviously, I have the dpi set so I don't understand where this error comes from. I'm running python 3.6 and matplotlib 3.0.3, I also just installed ffmpeg from ubuntu official repositories (Ubuntu 18.04). This is the part of my code that should affect that, although I think it should be something of the system: Writer = writers['ffmpeg'] writer = Writer(fps=15, metadata=dict(artist='Me'), (...)
• 09:16
  FFMPEG gives pull error in the middle of song [discord.py] - Amed Öz Newest 'ffmpeg' Questions - Stack Overflow
  It stops playing in the middle of the song. error: [tls ⓐ 0000019a745b13c0] Error in the pull function. [matroska,webm ⓐ 0000019a745ad200] Read error [tls ⓐ 0000019a745b13c0] The specified session has been invalidated for some reason. Last message repeated 1 times ffmpeg options: ffmpegopts = 'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': (...)
• 08:45
  Using FFmpeg change the video speed of different parts in python, I uses opencv and subprocess, but it's slow, is there another quicker way? - Jackal Zhao Newest 'ffmpeg' Questions - Stack Overflow
  There is a video file, need to process like that: [0, 13, 2] means the 0th to 13th frames need 2x speed, according to the list below, change the speed of different video parts, and write the result to an output file using H264 compression. [0, 13, 2] [13, 20, 1] [20, 25, 2] [25, 135, 1] [135, 164, 2] [164, 250, 1] [250, 254, 2] [254, 309, 1] [309, 354, 2] [354, 438, 1] [438, 465, 2] [465, 540, 1] [540, 625, 2] Hopefully I wish the whole process could be done by FFmpeg and python(the only language I know). Now I implementd (...)
• 05:33
  Error Exception: You do not have ffmpeg installed on your machine when using python bar_chart_race with reticulate in rstudio - Zhiqiang Wang Newest 'ffmpeg' Questions - Stack Overflow
  I have run python bar_chart_race successfully in jupyter notebook. import bar_chart_race as bcr bcr.bar_chart_race(df=wide_1, filename=None, title='Mortality (per million) by Country') I have ffmpeg installed on my machine. > Sys.which("ffmpeg") ffmpeg "C:\\\\ffmpeg\\\\bin\\\\ffmpeg.exe" However, when I tried the same code in rmarkdown with rstudio reticulate, import bar_chart_race as bcr bcr.bar_chart_race(wide_1) I received the following message: Exception: You do not have ffmpeg installed on your machine. (...)
• 04:48
  FFMpeg fails to detect input stream when outputting to pipe's stdout - La bla bla Newest 'ffmpeg' Questions - Stack Overflow
  We have h264 frames as individual files, we read them to a python wrapper and piping them to ffmpeg. ffmpeg subprocess is launched using command = ["ffmpeg", "-hide_banner", "-vcodec", "h264", "-i", "pipe:0", "-video_size", "5120x3072", '-an', '-sn', # we want to disable audio processing (there is no audio) '-pix_fmt', 'bgr24', "-vcodec", "rawvideo", '-f', 'image2pipe', '-'] pipe = sp.Popen(command, stdin=sp.PIPE, stdout=sp.PIPE, bufsize=10 ** 8) Our goal (...)
• 03:03
  very low latency streaminig with ffmpeg using a webcam - userDtrm Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to configure ffmpeg to do a real-time video streaming using a webcam. The ffmpeg encoder command I use is as follows. ffmpeg -f v4l2 -input_format yuyv422 -s 640x480 -i /dev/video0 -c:v libx264 -profile:v baseline -trellis 0 -subq 1 -level 32 -preset superfast -tune zerolatency -me_method epzs -crf 30 -threads 0 -bufsize 1 -refs 4 -coder 0 -b_strategy 0 -bf 0 -sc_threshold 0 -x264-params vbv-maxrate=2000:slice-max-size=1500:keyint=30:min-keyint=10: -pix_fmt yuv420p -an -f mpegts udp://192.168.1.8:5001 The ffplay command used to display the video (...)

26 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 20:35
  ffmpeg-python outputs black screen when trying to save as mp4 - Saya Newest 'ffmpeg' Questions - Stack Overflow
  This is my code. I am trying to make a video out of all pictures in the pics2 directory using ffmpeg. import subprocess command = 'ffmpeg -framerate 1 -i "pics2/Image%02d.png" -r 1 -vcodec libx264 -s 1280x720 -pix_fmt yuv420p Output.mp4' p = subprocess.call(command, shell=True) This saves an Output.mp4 successfully but the video has no frames (It is completely black) How do I solve this?
• 19:53
  Running pulseaudio inside docker container to record system audio - XXLuigiMario Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to set up a Docker container with Selenium that takes a recording of the browser with system audio using ffmpeg. I've got video working using Xvfb. Unfortunately, on the audio side, it seems to be more tricky. I thought I would set up a virtual pulseaudio sink inside the container, which would allow me to record its monitor: pacmd load-module module-null-sink sink_name=loopback pacmd set-default-sink loopback ffmpeg -f pulse -i loopback.monitor test.wav This works on my host operating system, but when trying to start the pulseaudio daemon in (...)
• 08:57
  FFMPEG Multiple task for converting video to image sequence for MacOS [duplicate] - Gabriel Moraes Aquino Newest 'ffmpeg' Questions - Stack Overflow
  I need help to make multiple task of that on MacOS: ffmpeg -i file.mp4 -r 0.1 output_%04d.jpg I have basically 200 video files to do that action and I want to create a single code that I can send to ffmpeg at once. I have tried with & in the end but it didn't work. please help! Gabriel
• 18:02
  stream from obs or wircast to rtmp server and restream as hls with ffmpeg - Shayegan1980 Newest 'ffmpeg' Questions - Stack Overflow
  I want to stream a video from wirecast to my server . My server os is cent os with lightspeed webserver . I want to know how I could to stream from wirecast to my server (to ffmpeg as rtmp server ) and restream an hls output . I use follow code but it is not working at all . ffmpeg -f hls -listen 1 -i rtmp://myserveripadress:8889/live/app -c copy -segment_list_flags +live -hls_time 10 -hls_list_size 6 -hls_wrap 10 -segment_list_type m3u8 -map 0:0 -map 0:1 -segment_time 10 (...)
• 16:06
  Add watermark in video with Google Cloud function python - Dharmeshsharma Newest 'ffmpeg' Questions - Stack Overflow
  I am adding watermark in uploaded video by http google cloud function but my code is return on ffmpeg non zero. my python code import os from google.cloud import storage from subprocess import check_output from videoprops import get_video_properties def hello_world(request): client = storage.Client() bucket = client.get_bucket('bucket_name') request_json = request.get_json() req_data = request.get_json() name = req_data['file'] videofile_name = (...)
• 15:56
  Concatenate Videos using FFMPEG : Glitchy\\Desync output - Ali Doggaz Newest 'ffmpeg' Questions - Stack Overflow
  I have a folder containing multiple video clips (including the Outro, which is an mp4 video). I'm running this code to concatenate the videos : os.system("(for %i in (*.mp4) do ⓐecho file '%i') > mylist.txt") os.system('more +1 "mylist.txt" > "Final_List.txt"') os.system("echo file 'Outro.mp4' >> Final_List.txt") #Final_list.txt will contain all the videos' paths, and will have the outro's path on its last line. os.system("ffmpeg -f concat -i Final_List.txt -c copy output.mp4") After executing that, I get a (...) -- https://gofile.io/d/zqadc2, https://gofile.io/d/G9Zbjo
• 15:38
  nginx rtmp ubuntu18.04 ffmpeg transcode problem - Muhammet Halit Parlak Newest 'ffmpeg' Questions - Stack Overflow
  I installed nginx rtmp on ubuntu 20.04, but somehow I could not run ffmpeg. Previously it was working in ubuntu 12.04. exec ffmpeg -i http://iptvle-platinum.dyndns-server.com:80/live/YQbNcng9Iu/HzZ15vbJzN/57835.ts -codec copy -bsf:v h264_mp4toannexb -f mpegts udp://51.77.148.186:2555; -- http://iptvle-platinum.dyndns-server.com:80/live/YQbNcng9Iu/HzZ15vbJzN/57835.ts
• 11:11
  FFMPEG H264 with custom overlay per frame - La bla bla Newest 'ffmpeg' Questions - Stack Overflow
  We have a stream that is stored in the cloud (Amazon S3) as individual H264 frames. The frames are stored as framexxxxxx.264, the numbering doesn't start from 0 but rather from some larger number, say 1000 (so, frame001000.264) The goal is to create a mp4 clip which is either timelapse or just faster for inspection and other checking (much faster, compressing around 3 hours of video down to At first I was creating a timelapse by pulling from S3 only the keyframes (i-frames? still rather new to codecs & stuff) and overlaying the filename on them and saving as png (which (...)
• 06:44
  Using FFMPEG, how do we add subtitles in the black bar area or under the video? - DunceDancer Newest 'ffmpeg' Questions - Stack Overflow
  I followed these steps: Added the black bars vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1" Source:How to add black borders to video Added the subtitles ("burned" it into the video) ffmpeg -i "imput.mp4" -lavfi "subtitles=subtitles.srt:force_style='Alignment=0,OutlineColour=&H100000000,BorderStyle=3,Outline=1,Shadow=0,Fontsize=18,MarginL=5,MarginV=25'" -crf 1 -c:a copy "output.mp4" Source: ffmpeg subtitles alignment and position Now I am stuck as to how to place the subtitles (...) -- Screenshot of the Problem
• 05:43
  Cut a video in between key frames without re-encoding the full video using ffpmeg? - bguiz Newest 'ffmpeg' Questions - Stack Overflow
  I would like to cut a video at the beginning at any particular timestamp, and it need to be precise, so the nearest key frame is not good enough. Also, these videos are rather long - an hour or longer - so I would like to avoid re-encoding this altogether if possible, or otherwise only re-encode a minimal fraction of the total duration. Thus, would like to maximise the use of -vcodec copy. How can I accomplish this using ffmpeg? NOTE: See scenario, and my own rough idea for a possible solution below. Scenario: Original video Length of (...)
• 03:54
  Use ffmpeg on windows to convert a set of png images to a set of webp images - januw a Newest 'ffmpeg' Questions - Stack Overflow
  I tried to use this command to convert all .png in the images directory to .webp, but it did not achieve the expected result. Is there any other way to achieve this function? images> (for %i in (*.png) do ffmpeg -i %i %2d.webp)
• 03:14
  FFMPEG Multiple task for converting video to image sequence - Gabriel Moraes Aquino Newest 'ffmpeg' Questions - Stack Overflow
  I need help to make multiple task of that: ffmpeg -i file.mp4 -r 0.1 output_%04d.jpg I have basically 200 video files to do that action and I want to create a single code that I can send to ffmpeg at once. I have tried with & in the end but it didn't work. please help! Gabriel
• 01:12
  I am using ffmpeg java library to convert captured screenshots to video. Video output is blurry - dark prince Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg java library to convert captured screenshots to video. Video which is generated as output is blurry. I am using bit rate as 9000, frames per sec as 25 and video size as that of desktop screen size. Any suggestions on how to solve this issue. P.S. I cannot use ffmpeg.exe and command line due to certain restrictions and hence I am opting for ffmpeg java library. Any suggestions on the issue or suggestions on any better approach will be helpful. Thanks in advance. ScreenRecorder.java import static (...) -- https://github.com/csanuragjain/recorder/tree/master/ScreenRecorder
• 00:48
  Colors messed up when converting an image sequence to video using ffmpeg - Form Newest 'ffmpeg' Questions - Stack Overflow
  I'm generating a video from a PNG sequence using ffmpeg but the resulting video has wrong colors compared to the source files. Getting the correct colors is important because we're using our video assets side-by-side with image assets and the colors must match perfectly (or at least, be as visually similar as possible so as not to be jarring). Our PNG input files are in the sRGB color profile. Here's the command we're running: ffmpeg -r 30 -f image2 -s 1920x1080 -i bg_analyse_%05d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p output5.mp4 And (...) --
• 00:36
  End FFMPEG execution when RTMP input is closed - tidpe Newest 'ffmpeg' Questions - Stack Overflow
  I have an RTMP arut server inside which I call a python script to run an FFMPEG command and create HLS packaging. Problem is that when I stop the RTMP stream, FFMPEG still run processes in background. FFMPEG string is like this: ffmpeg -re -v verbose -i rtmp://localhost:1935/live/testlive -rw_timeout 500 -http_persistent 1 -method PUT -http_user_agent test -f hls -hls_list_size 5 -hls_flags discont_start+delete_segments -vf "scale=426:trunc(ow/a/2)*2" -c:a libfdk_aac -ar 48000 -c:v h264 -profile:v main -crf 24 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 (...)

25 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 23:39
  Is encoding and streaming images into a video in under 30 ms realistic at all? - Hamza Ghizaoui Newest 'ffmpeg' Questions - Stack Overflow
  So, a client camera would be sending 20 FPS 4000 x 3000 pixel images per second. The client want it to be streamed in under 30 ms upon receiving via a web-browser with a 1920 x 1080 resolution . Here is how we approached the problem : Image received => openCV resizes it to 1920 x 1080 => image piped to FFMPEG => ffmpeg encode it to H.264 using Nvec hardware acceleration => FFMPEG sends it via UDP-packets to a Node.js server => the Node.js server serves it to client (using React as a front-end there) The encoding time requires circa 12 ms using my best options while (...)
• 23:34
  I received connection refused error while trying to stream live video through RTMP with FFMPEG - Femzy Newest 'ffmpeg' Questions - Stack Overflow
  I am working on a nodeJs app that can send camera stream to third party plartform i.e Facebook and Youtube using the RTMP protoco;.. It works well on my localhost but once i deploy to the server, it only give me errors. The error I get is below on this content.. Here is my codes server.js const child_process = require('child_process'); // To be used later for running FFmpeg const express = require('express'); const http = require('http'); const WebSocketServer = require('ws').Server; const app = (...)
• 21:25
  Creating text overlay like tiktok on a video in flutter [closed] - Sarthak Singhal Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to create an app in which user can add text on a video like the given image. The user should be able to move the text container anywhere on the screen, resize it, and rotate it also. When this is done, the text widget should be merged on the video. For now I have used Stack to add elements and let user play with them. I want to know how to merge this text along with the background color with the video and that too for a specific time (...) --
• 22:35
  How to extract motion vectors from h264 without a full decode on the CPU - Adrian May Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to use my nose as a pointing device. The plan is to encode the video stream from a webcam pointed at my face as h264 or the like, get the motion vectors, cook the numbers a bit and chuck them into /dev/uinput to make the mouse pointer move about. The uinput bit was easy. This has to work with zero discernable latency. This, for instance: #!/bin/bash [ -p pipe.mkv ] || mkfifo pipe.mkv ffmpeg -y -rtbufsize 1M -s 640x360 -vcodec mjpeg -i /dev/video0 -c h264_nvenc pipe.mkv & ffplay -flags2 +export_mvs -vf codecview=mv=pf+bf+bb (...)
• 20:11
  Merge two audio tracks in a video file into one track using FFmpeg [duplicate] - Alsors Newest 'ffmpeg' Questions - Stack Overflow
  Okay so I have a video file with a video track and two audio tracks. What FFmpeg command would I use to copy the video track over and merge the two audio tracks into one? I would like the audio tracks to remain at the same quality just merged.
• 20:00
  Continuously rotate image centered on background - Tudor-Radu Barbu Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to continuously rotate an image or series of images and output as a video with ffmpeg? Rotating image should be centered over a background. See example video. -- example video
• 19:43
  Problems with ffmpeg input filenames when using bash script - Nick Styles Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to use ffmpeg to convert some .m4a audio files to .mp3, and have come across something that has me stumped. I'd like to create the .mp3 in the same location and with the same filename as the .m4a, and so I'm using a combination of find/exec and a bash script to do this, as follows: find /Volumes/Untitled/ -name '[!.]*' -name '*.m4a' -exec ./m4atomp3.sh \\; where m4atomp3.sh looks like: #!/usr/bin/env bash || echo "$1 not found" ; exit 1 ; P="$1" echo "$P is the full filename" filename=$P%.* echo (...)
• 18:23
  FFmpeg : Segment muxer does not work for AVC-MXF - Mitra M Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to save input stream to separate files every 60 seconds with the following command: ffmpeg -i Input -vcodec libx264 -s 1920x1080 -pix_fmt yuv422p10le -aspect 16:9 -acodec pcm_s24le -ac 2 -ar 48000 -f segment -strftime 1 -segment_time 60 -y "e://o1/%H-%M-%S.mxf" but getting this errors: [mxf ⓐ 000002111453c640] h264 profile not supported0:00.62 bitrate=N/A speed=1.23x [mxf ⓐ 000002111453c640] could not get h264 profile av_interleaved_write_frame(): Operation not permitted Note: The following 3 commands work without any (...)
• 17:51
  OpenCV FFMPEG RTSP Camera Feed Errors - trn2020 Newest 'ffmpeg' Questions - Stack Overflow
  I'm getting these errors at random times when saving frames from an rtsp camera feed. The errors happen at different times, usually after 100-200 images have been saved, and the errors themselves are not always exactly the same. They cause the images that are saved at the time of the error to be distorted either to the point of being completely grey or contain distorted pixels. #Frame_142 - [hevc ⓐ 0c3bf800] The cu_qp_delta 29 is outside the valid range [-26, 25]. #Frame_406 - [hevc ⓐ 0b6bdb80] Could not find ref with POC 41 I've tried implementing the code in (...)
• 17:38
  unable to download a file using youtube_dl - perkymaster Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to play music from a bot using ffmpeg and youtube_dl by making using of discord.py but it seems that I am unable to download the file Here is my code, voice = get(client.voice_clients, guild=ctx.guild) ydl_opts= 'format': 'bestaudio/best', 'noplaylist': 'True', 'postprocessors': [ 'key': 'FFmpegExtractAudio', 'preferredcodec':'mp3', 'prefferedquality':'192', ], with youtube_dl.YoutubeDL(ydl_opts) as (...)
• 11:08
  Show error when build win32 version Ffmpeg in windows10,How solve it? [duplicate] - lslboy Newest 'ffmpeg' Questions - Stack Overflow
  I build a win32 version FFmpeg for get the .dll and .lib file in windows10 follow the https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT document, I executed the command ../../../configure \\ --toolchain=msvc \\ --disable-programs \\ --disable-d3d11va \\ --disable-dxva2 \\ --arch=x86 \\ --enable-shared \\ --enable-cross-compile \\ --target-os=win32 \\ --extra-cflags="-MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00" \\ --extra-ldflags="-APPCONTAINER WindowsApp.lib" \\ --prefix=../../../Build/Windows10/x86 everything works well, (...) -- https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT
• 16:28
  Extract image of every frame of a video using react-native-ffmpeg - EdG Newest 'ffmpeg' Questions - Stack Overflow
  I have looked all over the internet to get a way to extract image of everyframe of a video using react-native-ffmpeg. I am making a mobile app and I want to show all per frame images on the video timeline. I want to do this natively on mobile so that I can utilise hardware power of mobile. That is the reason I am looking for react-native-ffmpeg kind of library. Am I in the right direction? This npmjs.com/package/react-native-ffmpeg is what I am trying to use. I need to know the command to do the job. (...) -- npmjs.com/package/react-native-ffmpeg
• 15:46
  Problem with Getting Output with Accents When Using PHP exec Command with ffprobe - user5919866 Newest 'ffmpeg' Questions - Stack Overflow
  I am retrieving the output of ffprobe with PHP exec command to get information from mp3 files. The problem is that if there is any text in the output containing accents or apostrophes, then I don't get those displayed. I am running PHP 7.3.19 on Debian 10. The output locale -a from the commandline is: C C.UTF-8 en_US.utf8 POSIX I have tried several things in my PHP script such as: $cmd = 'LANG=\\"en_US.UTF8\\" ffprobe -loglevel error -show_entries format=duration:format_tags -of json "' . $FinalFilenamePath . '"'; exec($cmd, (...)
• 13:21
  Discord.js Music Bot ffmpeg not found? - cccmdm Newest 'ffmpeg' Questions - Stack Overflow
  I just started learning javascript with node.js and I am attempting to create a music bot, I've set up the command handler and everything, however, I keep getting this error when I try to run the play command Error: FFmpeg/avconv not found! at Function.getInfo (C:\\Users\\johnd\\OneDrive\\Desktop\\discordBot\\node_modules\\prism-media\\src\\core\\FFmpeg.js:130:11) at Function.create (C:\\Users\\johnd\\OneDrive\\Desktop\\discordBot\\node_modules\\prism-media\\src\\core\\FFmpeg.js:143:38) at new FFmpeg (...) -- https://imgur.com/a/EFM1G6s
• 13:42
  How to extract jpeg/png images from RTSP stream without encoding the whole stream? - Rune Aspvik Newest 'ffmpeg' Questions - Stack Overflow
  I am building a video system in Node.js based on IP cameras. They all output RTSP streams and MJPEG streams. However the Mjpeg is unreliable for web browser display snapshots and so I want to create my own snapshots. I'm using FFMPEG to record the RTSP stream so that's been my tool. So far I've tried two options: FFMPEG with two outputs: ffmpeg -i rtsp://.... -c copy output.ts -r 1/5 -s 640x360 -f image2 -update 1 -y snap.jpg This works really well, but it's using a lot of resources since even though I only need a low res image every 5 sec, it (...)
• 12:14
  FFMPEG - local video to UDP streaming to OpenCV - video quality degraded - user3925023 Newest 'ffmpeg' Questions - Stack Overflow
  my goal is to re-stream local video content / desktop screencasting, to an UDP flow that I need to process on a Python script. Here is the FFMPEG script that I'm using: ffmpeg -re -i C:\\Users\\test\\Downloads\\out.ts -strict -2 -c:v copy -an -preset slower -tune stillimage -b 11200k -f rawvideo udp://127.0.0.1:5000 And here is the simple Python script supposed to read the stream flow: import cv2 cap = cv2.VideoCapture('udp://127.0.0.1:5000',cv2.CAP_FFMPEG) if not cap.isOpened(): print('VideoCapture not (...) --
• 11:54
  I am merging two videos using ffmpeg concat filter. First video has no audio and 2nd video has audio. How do I do it? [closed] - Akashnil Roy Newest 'ffmpeg' Questions - Stack Overflow
  When I merge it I have an output video file which has the audio of the 2nd video file missing. I am using : ffmpeg -f concat -safe 0 -i -c copy The txt file contains the name of the 2 files. I have looked through the ffmpeg documentation. I am new to this and can't understand where lies the problem.
• 11:05
  ffmpeg throwing System.AccessViolationException - shmit Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to extract frames and iterate over them. The codes iterates correctly over few frames and then then randomly throws error "System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' Any suggestions on how to resolve it? System details and screenshot below: System Details: OS: Windows TargetFramework: .netCore3.1 Nugets: FFMediaToolkit v3.0.0 and SixLabors.ImageSharp v1.0.0 Shared dlls copied from: https://ffmpeg.zeranoe.com/builds/ for version (...) -- https://ffmpeg.zeranoe.com/builds/,
• 10:53
  C# WinForms, play video using the FFmpeg library - Damn Vegetables Newest 'ffmpeg' Questions - Stack Overflow
  According to web search results, FFmpeg.AutoGen provides video/audio frames with timing data, and I could use them to render the way I want. But I cannot find a simple example for playing a video file on a WinForms window, using FFmpeg. In the example file, I can see code for initialisation and decoding video frames. How to play those frames smoothly on WinForms? Should I use some sort of DirectX library? -- In the example file
• 10:33
  Using FFmpeg AutoGen save to bitmap works on Windows but not on Linux - Chris Newest 'ffmpeg' Questions - Stack Overflow
  I'm using FFmpeg.AutoGen to decrypt video and save the frames as bitmaps. Code is using dotnet core and I'd like to get it working for both Windows and Linux. The code is similar to the example provided: https://github.com/Ruslan-B/FFmpeg.AutoGen/blob/db9bcd4b9dfad5d117ffd71fe1a2d073e96a3520/FFmpeg.AutoGen.Example/Program.cs AVFrame convertedFrame = this.converter.Convert(frame); Bitmap image = new Bitmap(convertedFrame.width, convertedFrame.height, convertedFrame.linesize[0], PixelFormat.Format24bppRgb, (IntPtr)convertedFrame.data[0]); When saving the (...) -- https://github.com/Ruslan-B/FFmpeg.AutoGen/blob/db9bcd4b9dfad5d117ffd71fe1a2d073e96a3520/FFmpeg.AutoGen.Example/Program.cs
• 10:07
  Extract video or audio from frame index ffmpeg [duplicate] - DustinPham Newest 'ffmpeg' Questions - Stack Overflow
  I have a list of frames index, for example: [1,5,6,7,100,106,1100]. How I extract a video / audio from source video that only includes the above frames using ffmpeg?
• 10:07
  (FFmpeg) How to extract vocal from a song? - tasy5kg Newest 'ffmpeg' Questions - Stack Overflow
  As we all know, we can use FFmpeg to remove vocal from a song: $ ffmpeg -i song.mp3 -af pan="stereo|c0=c0|c1=-1*c1" -ac 1 karaoke.mp3 Then, how to use FFmpeg to do the opposite thing: extract vocal from a song?
• 06:53
  FFMPEG - how to transcode input stream while cutting off first few seconds of video and audio - purplepear24 Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to transcode a screen-record (x11) input stream to MP4. I would like to cut off the first ~10 seconds of the stream, which is just a blank screen (this is intentional). I understand how to trim video with ffmpeg when converting from mp4 to another mp4, but i can't find any working solution for processing an input stream while accounting for delay and audio/video syncing. Here is my current code: const spawn = require('child_process'); const S3Uploader = require('./utils/upload'); const MEETING_URL = (...)
• 06:03
  FFMPEG - Encode a .wav file to G711 - aebner Newest 'ffmpeg' Questions - Stack Overflow
  My question is the following: how to encode a .wav file to G.711/PCM A-law? I tried to edit this example file, but I got an EINVAL error when tried to call av_frame_get_buffer(frame, 0) with frame->nb_samples = c->frame_size which is 0 (I think this is the problem) because of pcm.c:37 (at least I think because of it). So with which parameters allocate an audio data buffer by myself if av_frame_get_buffer() doesn't do this for me and how to use it? Thanks for reply! EDIT: My code: #include #include #include #include #include (...) -- this example file, pcm.c:37
• 05:17
  AWS lambda layer call says opt/ffmpeg is not a directory - Mayowa Daniel Newest 'ffmpeg' Questions - Stack Overflow
  I followed this tutorial for making ffmpeg a lambda layer https://www.serverless.com/blog/publish-aws-lambda-layers-serverless-framework I ran ls in my directory with spawnsync and the opt directory was empty and so ffmpeg didn't fire. Any pointers on what I might be doing wrong? I'm using node.js12.x as my runtime with the serverless framework. -- https://www.serverless.com/blog/publish-aws-lambda-layers-serverless-framework
• 04:56
  ffmpeg compile fail with unknown problem (for android) - Rocky Newest 'ffmpeg' Questions - Stack Overflow
  FFmpeg version : latest version download from ffmpeg.org Compile environment : window 10 with mingw msys NDK : r21b I want to compile FFmpeg .a file to one 'libffmpeg.so'. I get an error message but I don’t know the reason. Error message is clear but I can't find where is -lgcc_real or how to get it. following message is my error message. d:\\android-ndk-r21b\\toolchains\\llvm\\prebuilt\\windows-x86_64\\bin\\aarch64-linux-android-ld.exe: cannot find -lgcc_real following code is my build (...)
• 04:26
  How to install libavcodec and libavutil from its source in linux - Necktwi Newest 'ffmpeg' Questions - Stack Overflow
  FFMPEG is providing libavutil and libavcodec libraries. While compiling and installing ffmpeg as described at https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu I can find libavcodec and libavutil folders in the ffmpeg source folder. I want to install these libraries to use them in my c++ programs. But there are no Makefiles in these folders. How can I install them? -- https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
• 00:23
  How can I extract a good quality JPEG image from a video file with ffmpeg? - Daniel Gartmann Newest 'ffmpeg' Questions - Stack Overflow
  Currently I am using this command to extract the images: ffmpeg -i input.mp4 output_%03d.jpeg But how can I improve the JPEG image quality?
• 00:05
  ffmpeg quality conversion options (video compression) - Jason Hunter Newest 'ffmpeg' Questions - Stack Overflow
  Can you provide a link, or an explanation, to the -q:v 1 argument that deals with video/image quality, and compression, in ffmpeg. Let me explain... for f in * do extension="$f##*." filename="$f%.*" ffmpeg -i "$f" -q:v 1 "$filename"_lq."$extension" rm -f "$f" done The ffmpeg for loop above compresses all images and videos in your working directory, it basically lowers the quality which results in smaller file sizes (the desired outcome). I'm most interested in the -q:v 1 argument of this for loop. The 1 in the -q:v 1 argument is (...) -- the official documentation

24 September

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 23:20
  ffmpeg - DF vs NDF (Drop Frames) vs (Non Drop Frames), how to simply pass input timecode to output - Selene Newest 'ffmpeg' Questions - Stack Overflow
  Please help with this issue. The broadcaster just rejected my submitted video because their validation tool threw this kind of error: was configured as "Non drop Frame". "Drop Frame" expected. I'm only processing video, and I expect the audio to just be copied from input to output. Running and comparing input with output using ffprobe shows difference in timecode: Metadata: major_brand : qt minor_version : 537199360 compatible_brands: qt creation_time : 2020-02-29T22:07:42.000000Z Duration: 00:00:20.05, start: 0.000000, bitrate: (...)
• 21:32
  ffmpeg afade not being applied to atrim - Red Newest 'ffmpeg' Questions - Stack Overflow
  I used ffmpeg command line like this: ffmpeg -i test.mp3 -filter_complex "atrim=2:duration=6;afade=t=in:st=0:d=2" -y -vn output.mp3 Get error: Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_afade_1 Why does output.mp3 have no fade in?
• 20:40
  Comparing PSNR of two videos, possibly with ffmpeg? - UnixNerd Newest 'ffmpeg' Questions - Stack Overflow
  I would like to compare a large number of videos to a good reference video in order to find videos with poor quality. I want to do this in a batch mode by calling a command line utility, I'm already using ffmpeg in this manner to grab video frames. ffmpg will give me a PSNR value to compare the input and output videos if I transcode a video. I was under the impression I could use something like this to compare two separate videos but can't find a way to do it. Would I be better grabbing a single frame from each video and comparing those somehow? PSNR may not (...)
• 19:45
  Video Overlay not returning to black once video stopped - Matt Nelson Newest 'ffmpeg' Questions - Stack Overflow
  I am combining multiple videos from a webrtc call and aligning the "user-terminal" videos to the left, and the "user-visitor" videos to the right. As the visitor feed can start and strop, they have multiple videos so I'm offsetting them by the timestamp. This is working, however crazy it looks! The one last issue I have is that when the first visitor video stop on the right, it shows the last frame of that video until the next video starts on the left. Can I have it return o the black background? Here is the command passed to ffmpeg: ffmpeg -y -i (...)
• 19:02
  How can I use ffmpeg to stream over http - user3754828 Newest 'ffmpeg' Questions - Stack Overflow
  I am using the follow commands to stream to my localhost ffmpeg -i b.mp4 -r 60 -bufsize 1024k -vcode libtheora -qscale:v 1 -f ogg "udp://ⓐ127.0.0.1/video.ogg" ffmpeg -i b.mp4 -r 60 -bufsize 1024k -vcode libtheora -qscale:v 1 -f ogg "http://127.0.0.1/video.ogg" The both work very well, at least do not show any errors, but when I try play such http stream does not, it gave me error "not found" Can somebody help me on it? I am complety lost in this issue...also when I try include some port, for example ffmpeg -i b.mp4 -r 60 -bufsize 1024k -vcode (...)
• 17:27
  FFMPEG - Edit encode_audio.c to be able to encode a .wav file to G711 - aebner Newest 'ffmpeg' Questions - Stack Overflow
  My question is the following: how to edit this example file to be able to encode a .wav file to PCM A-law? I tried it and I got an EINVAL error when tried to call av_frame_get_buffer(frame, 0) with frame->nb_samples = c->frame_size which is 0 (I think this is the problem) because of pcm.c:37 (at least I think because of it). So with which parameters allocate an audio data buffer by myself if av_frame_get_buffer() doesn't do this for me and how to use it? Thanks for reply! EDIT: My code: #include #include #include #include #include (...) -- this example file, pcm.c:37
• 17:16
  Batch Compress Select Image and Video Types in a Folder with ffmpeg - Jason Hunter Newest 'ffmpeg' Questions - Stack Overflow
  for f in * do extension="$f##*." filename="$f%.*" ffmpeg -i "$f" -q:v 1 "$filename"_lq."$extension" rm -f "$f" done How do I use the known working code shown above to do two things simultaneously? Compress all jpg files in the working directory, utilizing ffmpeg's -q:v 1 argument Compress all mp4 files in the working directory, utilizing ffmpeg's -crf 23 argument I'm using Ubuntu Linux 20.04. My franken-code below doesn't quite work and deletes the image files. for f in * do  (...)
• 17:09
  Batch Compress all Images and Videos in a Folder with ffmpeg - Jason Hunter Newest 'ffmpeg' Questions - Stack Overflow
  for f in * do extension="$f##*." filename="$f%.*" ffmpeg -i "$f" -q:v 1 "$filename"_lq."$extension" rm -f "$f" done How do I use the known working code shown above to do two things simultaneously? Compress all jpg files in the working directory, utilizing ffmpeg's -q:v 1 argument Compress all mp4 files in the working directory, utilizing ffmpeg's -crf 23 argument I'm using Ubuntu Linux 20.04. My franken-code below doesn't quite work and deletes the image files. for f in * do  (...)
• 15:56
  Could not load file or assembly 'Accord.Video.FFMPEG.x64.DLL' or one of its dependencies. The specified module could not be found - Sandeep Kumar Newest 'ffmpeg' Questions - Stack Overflow
  Trying to merge image and audio file to create a video file. I have tried changing the arch (x86 and x64). Manually moved all the dependent .dlls for "Accord.Video.FFMPEG.x64.DLL" to the the bin. used both Accord and Aforge, both of them have the same issue. installed VC++ redistribuable 2013 and 2015-19 Following is the base code: private const string _basePath = ⓐ"D:\\R&D Projects\\AudioVideoConvertor\\VideoAudioMerger\\VideoAudioMerger\\Images\\"; protected void Page_Load(object sender, EventArgs e) int width = (...) -- https://drive.google.com/file/d/1JAt8ZUCCsIwez0fkdvq_2FGeGXif5rwu/view?usp=sharing
• 14:53
  Setting up RTP on Nginx - Swap Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to use Janus Media Server to relay WebRTC streams to a particular RTP host/port, from where ffmpeg can pick it up as an input and convert it further to an rtmp stream, which can then be used to broadcast to various social media platforms (such as, YouTube, Twitch, Facebook, etc.) My inspiration for this has been the following blog - https://www.meetecho.com/blog/firefox-webrtc-youtube-kinda/ Specifically, I'm trying to replicate the following architecture - And Janus, as per their documentation, has a very neat API for doing it -  (...) -- Janus Media Server, https://www.meetecho.com/blog/firefox-webrtc-youtube-kinda/
• 11:20
  FFMpeg conversions from avi to mp4 does not succeed with video for safari and IE browsers - user27240 Newest 'ffmpeg' Questions - Stack Overflow
  The ffmpeg command below does convert mp4 file from avi file successfully for chrome browser, but with browsers such as safari and IE(I have not tested with other browsers yet.) I can not see the video and I only can hear the audio which simply means that safari and IE browsers do not accept the conversion of video from avi file to mp4 file. for i in /xxxxxx/xxxxxxx/xxxxxxx/*.avi; do ffmpeg -i "$i" -pix_fmt yuvj422p "/xxxxxx/xxxxxxx/xxxxxxx/$(basename "$i" .avi).mp4"; done By the way, when I tried from flv file to mp4 with the same ffmpeg command both (...)
• 11:22
  Generate frame images from video and compile them back to the video in-memory - gumkins Newest 'ffmpeg' Questions - Stack Overflow
  I have to remove some repeating frames from the beginning of a video file. For that I'm generating frame images from the video ffmpeg -i input.mp4 -qscale:v 2 frame_%04d.jpg This command generates a set of files with index in name. Then I'm analyzing frames against some criteria programmaticaly, removing useless ones and compiling the rest back to the video file ffmpeg -r 60 -start_number 0 -i "frame_%04d.jpg" -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4 What I don't like in this schema that IO operations take part in the process. I would like (...)
• 11:03
  unable to read stderr - Sarmad S. Newest 'ffmpeg' Questions - Stack Overflow
  I have the following code, which works fine locally: const child_process = require("child_process"); const path = require("path"); exports.handler = async (event) => var ffprobePath = path.resolve(__dirname, 'ffmpeg-static', 'ffprobe'); var ffmpegPath = path.resolve(__dirname, 'ffmpeg-static', 'ffmpeg'); var ffprobeArgs = [ '-i', 'tb.jpg' ] var proc = child_process.spawnSync(ffprobePath, ffprobeArgs); console.log(proc.stderr.toString()) //toString on (...)
• 10:21
  How can I learn the effective quality of the h264_nvenc encoder? - pfdint2 Newest 'ffmpeg' Questions - Stack Overflow
  I seek to ascertain the end-product quality of various cq ("constant quality") values for the h264_nvenc video encoder. To use the h264_nvenc encoder through ffmpeg and with a target quality, I follow the instructions in Nvidia's documentation, last paragraph of the linked anchor. I specify a Variable Bit Rate rate control mode (rc=vbr_hq) and a target quality (cq=). This should be enough to test various values of cq. The story should end there. HOWEVER, that only outputs the same perfect quality video of extremely large size for any cq value. (Using cq=1, cq=20, and (...) -- Nvidia's documentation
• 09:43
  Thumbnail of segmet videos with ffmpeg - guidop21 Newest 'ffmpeg' Questions - Stack Overflow
  I am using FFMPEG to split a video into many 60 second video clips using a camera with the following command: ffmpeg -f dshow -rtbufsize 2000M -i video="Game Capture HD60 S (Video) (#01)" -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 pix_fmt yuv420p -b:v 1000k -minrate 500k -maxrate 2000k -bufsize 2000k -vf scale=854:480 -f segment -segment_time 60 -reset_timestamps 1 -flush_packets 1 "C:\\Program Files (x86)\\ffmpeg\\test\\clips\\testfile_%02d.mp4" For each segment I would also like to have the thumbnail of the video. How could I (...)
• 09:13
  Reading frames from MP4 segment (.m4s). or Dash Segment [closed] - Vamsi Krishna Rayapati Newest 'ffmpeg' Questions - Stack Overflow
  Generally we do it by copying init.mp4 and segment1.m4s to a video file and extract frames in that video It works fine. But it requires a temporary file I want to edit segment1.m4s directly ''' my idea is to decode the video Direclty with out using init file ''' Help me .how to do it ?
• 08:50
  FFMPEG with KLV metadata - Mar Andrés López Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to clip a video with KLV. When I edit a video with KLV I lose the KLV metadata. I have read about -map 0 option, from my understading it copies all the streams of a video from the input 0. The command I have tried and it is not working is the following: ffmpeg -ss 00:01:00.000 -t 00:04:00.000 -re -i video.mpg -map 0 -c copy -f mpegts out.mpg When I use a video player that displays KLV the KLV is not displayed for out.mpg, But even more simple (without clipping the video): ffmpeg -i video.mpg -map 0 -c copy -f mpegts out.mpg If I do this to (...)
• 04:13
  Duplicated frames when mering multiple videos with xfade filter (ffmpeg) - tjk Newest 'ffmpeg' Questions - Stack Overflow
  I'm stuck with merging multiple videos with audio. This used to work on most videos I merged before but with some videos, I get the "More than 1000 frames duplicated" warning, and the output video is broken (some videos won't play, just static picture and the sound is misaligned). All videos are in the same format afaik. The only difference I see is that some are "yuvj420p(pc)" and most are "yuv420p". But I tried merging without those with "yuvj420p(pc)" and it didn't help. Already tried adding "-vsync vfr", didn't help too. Interestingly — if I remove the (...)
• 03:44
  Concatenate Movies from Python List using MoviePy or FFmpeg - Python_Learner_DK Newest 'ffmpeg' Questions - Stack Overflow
  I have about 10,000 short videos that I am trying to make several longer videos from. I've created these videos using MoviePy, but keep getting memory errors when trying to concatenate them back together. In my code I have an outer loop going through each letter of the alphabet and getting the files that start with that letter. From the returned video clips I get the length and and strip off the last 3.5 seconds (outro_clip_duration) of the video, and then add it into a Python list clips. Where I'm stuck is I then want to take this list (...)
• 00:47
  FFMPEG control delay and looping for generating APNG - fmw42 Newest 'ffmpeg' Questions - Stack Overflow
  I have a (random selection) of JPG images that I want to use to make into an APNG animation using ffmpeg (to test the process). They are all the same dimensions (256x256). But I cannot seem to get the correct syntax to control the frame delay and loop control (to loop forever). Is it possible to set these parameters using ffmpeg when creating an APNG from a sequence of images? If so, can someone provide the proper syntax and/or show an example command? I have searched the ffmpeg documentation and cannot seem to find relevant syntax. I can do the following, but it will not accept (...)