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