21 January

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

• 14:27
  Video size optimization - Heba Gamal Eldin Newest 'ffmpeg' Questions - Stack Overflow
  I'm working on a task that should optimize the video's size before uploading to the server in a web application. So i want my model to automatically optimize each input video size. I have many trials in different approaches like FFmpeg: I used libx265, h264 and lib265 as a codec, with some videos it increases the video size and others minimize it with little ratio and it takes so long to generate the output file. for example with video of size 8M input = input_name: None output = output_name: '-n preset faster -vcodec libx265 -crf 28' The output file is 10M. And also tried OpenCV: But (...)
• 14:05
  FFMPEG cannot encode video with high speed change - Ham789 Newest 'ffmpeg' Questions - Stack Overflow
  Hi I am trying to speed up and trim clips with FFMPEG version 4.2.2. Is there a limit to how fast you can speed up a clip? If I try to speed up a clip over a certain then the output file cannot be opened. I have tried two methods without any luck: 1. using the setPTS filter and 2. inputing the file at a faster frame rate. 1. ffmpeg -i GH012088.MP4 -y -ss 18 -t 0.48 -an -filter:v "setpts=0.096*PTS" -r 25 output.MP4 2. ffmpeg -r 312.1875 -i GH012088.MP4 -y -ss 18 -t 0.48 -r 25 -an output.MP4 I am trying to create a clip from the input that starts at 1 second in the original clip, plays (...)
• 13:39
  Video watermarking with ffmpeg (output video size too big ) - kartik bansal Newest 'ffmpeg' Questions - Stack Overflow
  i am running ffmpeg on video of size around 2 Mb and after watermarking them size of my video file is around 13-17 Mb. AM i doing something wrong. Please Help My code is ffmpeg -i "C:\\flask\\mobile_form\\Videos\\20191231140058_987654567.mp4" -i "C:\\flask\\mobile_form\\resizeLogo.jpg" -filter_complex "[0:v][1:v]overlay=10:10,drawtext=text=Hello:fontsize=24:x=main_w-200:y=main_h-100,drawtext=text=World:fontsize=24:x=main_w-200:y=main_h-60" "C:\\flask\\mobile_form\\waterMark\\second.mp4"
• 13:35
  ffmpeg encoding & decoding webcam stream into h264 file using Intel Quick Sync Video hw accelerated decoding - Fedalovich Newest 'ffmpeg' Questions - Stack Overflow
  Using ubuntu 18.04 on NUC. I'm succeeding to use it from a file input. How can I get my webcam input to work with the HW accelerated. Succeeded running the following: ffmpeg -hwaccel qsv -c:v h264_qsv -i input.mp4 -vf hwdownload,format=nv12 -pix_fmt yuv420p output.yuv
• 13:29
  Remove portion of some frames from a video - FlafyMation Newest 'ffmpeg' Questions - Stack Overflow
  Here is what I'm trying to do: Imagine a video with 10 frames (0 = 1 frame) 0 0 0 0 0 0 0 0 0 0 with some frames selected(1 = 1 selected frame) 0 1 1 1 0 0 0 0 0 0 and the end results should be this(all selected frames got removed from the video) 0 0 0 0 0 0 0 this is what I'm trying to do in python(with frames not times). Does anybody knows how I can do that?
• 13:06
  How do you convert an entire directory with ffmpeg? - Eugene Newest 'ffmpeg' Questions - Stack Overflow
  How do you convert an entire directory/folder with ffmpeg via command line or with a batch script?
• 13:05
  How to decode AVFrame with pixel format AV_PIX_FMT_CUDA in software? - M. Ying Newest 'ffmpeg' Questions - Stack Overflow
  I recently followed this example (https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_encode.c) to encode an AVFrame using NVENC (by swapping out AV_PIX_FMT_VAAPI with AV_PIX_FMT_CUDA and h264_vaapi with h264_nvence, among other things). I am now trying to decode the packet that I encoded and converting it to AV_PIX_FMT_YUV420P as such: AVFrame *frame; AVCodecContext *context; AVCodec *codec; avcodec_register_all(); codec = avcodec_find_decoder(AV_CODEC_ID_H264); // allocate and set ffmpeg context context = avcodec_alloc_context3(decoder->codec); // open capture decoder (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_encode.c, https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c
• 12:34
  Extract AUDIO, manipulate & merge again - omarali linux Newest 'ffmpeg' Questions - Stack Overflow
  I'm using Spleeter to remove music from audios. My goal is to build a script that automates the process of extracting audio from the video, execute Spleeter on the extracted audio & than merge the manipulated audio back to the video replacing the original one. The main issue I had is that I don't have enough ram to process the whole extracted audio. I need to split it the into multiple pieces & execute Spleeter upon each piece. Then concatenate the manipulated pieces together and merge the result to the video. Here's what I tried: #!/bin/bash cd ~/Desktop/Video-convert # (...) -- Spleeter
• 11:53
  Pyinstaller "Failed to execute script pyi_rth_pkgres" and missing packages - gurnben Newest 'ffmpeg' Questions - Stack Overflow
  This is my first time posting a question here as most of my questions have already been answered by someone else! I am working on a GUI application in python and am attempting to use pyinstaller to package it into a single folder and .exe for easier portability. Currently, I am using windows 10 and anaconda3 to manage my python packages. The application relies on tkinter, pillow, numpy, scikit-learn, opencv, ffmpeg, and matplotlib. The application is formatted with a main GUI.py file that creates objects of a number of other files (many of which are stored in a subfolder as this GUI is (...)
• 10:27
  How to get an exact audio channel layout info by ffmpeg? - xin xu Newest 'ffmpeg' Questions - Stack Overflow
  How to get a audio channel layout info by ffmpeg? For example,if audio is 5.1 then I want to get info following like FL+FR+FC+LFE+BL+BR
• 10:15
  How to create transparent GIF using FFMPEG command? - Krupali Shingala Newest 'ffmpeg' Questions - Stack Overflow
  I tried this command for create transaprent GIF, but created gif take black image always. "-y", "-start_number", "1", "-i", path + "%d.png", "-vf", "scale=480x240", "-preset", "ultrafast", gifpath
• 09:26
  CPU limit on multiple FFMPEG process - Sean Pribadi Newest 'ffmpeg' Questions - Stack Overflow
  when i worked with ffmpeg single process, i could use cpulimit to limit their CPU usage for not use 100% cpu usage. But how to limit overall ffmpeg if i run 2 or more ffmpeg process at the same time ? The overall process by ffmpeg will be used 100% cpu usage
• 05:09
  ffmpeg support on heroku (Discord Bot) [closed] - itsfood Newest 'ffmpeg' Questions - Stack Overflow
  I'm wondering how to get my bot (was functioning fine on my pc) to get access to ffmpeg. I've uploaded the ffmpeg files just how they were in the folder when they worked on my pc, but my bot crashes when asked to perform the same commands when being hosted by Heroku. How do I get ffmpeg to work with Heroku?
• 08:43
  FFMPEG: sws_scale returns error: Slice parameters 0, 2160 are invalid - Matthew Czarnek Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to follow a tutorial to display ffmpeg AVFrame output in SDL. The tutorial(and all examples I'm seeing online) are still using 'sws_getContext', which has been deprecated and removed from the newest version of ffmpeg. Trying to change current pixel format from whatever it currently is to PIX_FMT_YUV420P, so I can display it. I believe I need the sws_scale function to accomplish this. However, sws_scale is the function that causes a command line error of: Slice parameters 0, 2160 are invalid Here is all my code associate with swsContext: struct SwsContext* av_sws_ctx = NULL; (...)
• 08:27
  error: 'libavutil/internal.h' file not found - Orest Newest 'ffmpeg' Questions - Stack Overflow
  I'm using ffmpeg lib. I try #include "libavutil/internal.h" but received error 'libavutil/internal.h' file not found. What should I have to do?
• 08:22
  FFmpeg to convert "many" mp3 files to wav files - ab123 Newest 'ffmpeg' Questions - Stack Overflow
  I wish to convert some hundred thousand small-duration(mp3 files to wav files. But the process presently takes several days to complete. I would like to know if there is a faster way than what I am currently doing. Currently, I am just spawning threads and calling ffmpeg via subprocess module in Python. When I use subprocess.Popen() I quickly get memory errors because too many threads get started. Using subprocess.call() works error-free. Additionally, I am using threading.Semaphore() to limit maximum number of working threads. Code: import threading import subprocess maxthreads = 50 (...)
• 06:26
  FFmpeg end of filter semicolon being ignored when evaluating chained filters - Peter Lockhart Newest 'ffmpeg' Questions - Stack Overflow
  I'm new to FFmepg so please forgive me if the terminology is wrong. I would like to add text and audio to an existing video file. I'm chaining together 2 drawTexts, then in a different filter, I want to merge audio tracks of the original source video and some background music. ffmpeg -i sourceNoText.mp4 -i backgroundMusic.mp3 -filter_complex "drawtext=enable='between(t,0,3.5)':fontfile=burbank.ttf:text='Your name - PETER':fontsize=90:x=(w-text_w)/2:y=(h-th-(h/10)-20):fontcolor='White', drawtext=enable='between(t,11.5,14.75)':fontfile=burbank.ttf:text='You couldn't have done it without (...)
• 03:23
  Ffmpeg converts video of double size of original video with second part without audio - mridul4c Newest 'ffmpeg' Questions - Stack Overflow
  I am converting some videos with below command in ffmpeg ffmpeg -y -i source.mp4 -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts keyint=24:min-keyint=24:no-scenecut -crf 18 -b:v 4000k -maxrate 4000k -bufsize 4000k -vf "scale=-1:1080" destination_1080.mp4 But in some cases the output video is exactly double size of the original and the second part is without audio. Please help.
• 01:55
  add ffmpeg.exe, ffprobe.exe, D3DCompiler_43.dll to exe file by using pyinstaller - 임수진 Newest 'ffmpeg' Questions - Stack Overflow
  Execution Environment : Windows10, Anaconda, Python3.6 My program use ffmpeg.exe, ffprobe.exe, D3DCompiler_43.dll in execution. I must make .exe file including them all. I try pyinstaller setup.spec It completed successfully. But, .exe file doesn't work properly. setup.spec outcome of exe file -- setup.spec, outcome of exe file

20 January

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

• 22:54
  ffmpeg-python: Test if video clip has audio - Paul Newest 'ffmpeg' Questions - Stack Overflow
  Im using ffmpeg-python to do some video transformations. If I have the following: infiles = [] infile = ffmpeg.input("/tmp/xxx.mp4") infiles.append( infile['v'] .filter('scale', size='1920x1080', force_original_aspect_ratio='decrease') .filter('pad', '1920', '1080', '(ow-iw)/2', '(oh-ih)/2') ) infiles.append(infile['a']) ( ffmpeg .concat( *infiles, v=1, a=1, unsafe=True) .output(out_tmp_file) .run() ) When I run it, I get the following error: Stream specifier ':a' in filtergraph description (...)
• 21:13
  RTMP server can't stream video (only audio) - Jeffrey Newest 'ffmpeg' Questions - Stack Overflow
  I'm implementing an RTMP server right now, and everything's been working except for video streaming. I can stream audio with no problems (using OBS to stream), and play it back via VLC. The problem is VLC plays the audio, but no video. What I'm doing right now is forwarding every audio and video message I receive from OBS, I grab the original payload (audio/video data) and put in a Type 0 Chunk, since I've seen pretty much every implementation do this. I don't know if I'm missing some sort of processing that should be done on the video data. If I try to playback with ffmpeg (saving the (...)
• 20:39
  Converting multiple RTP Streams into gRPC Stream - GJ. Newest 'ffmpeg' Questions - Stack Overflow
  I am receiving multiple RTP streams(g711 ulaw/alaw) which may be coming on TCP or UDP, I want to terminate the RTP and get the raw media from the RTP stream and stream it to a different destination by using Google gRPC protocol. Currently I have a RTP processing engine which does this and give me the raw stream from RTP stack which i further stream to gRPC destination, but this solution does not scale beyond 1000 streams on one host and is difficult to maintain. I want to replace this with some highly scalable solution where i can scale to several thousand of streams and does not need (...)
• 20:23
  ffmpeg: match audio video duration post concatenation - Massimo Vantaggio Newest 'ffmpeg' Questions - Stack Overflow
  I wrote this bash to automate concatentation of videos for dash mpeg streaming infinite loop. Im unable to obtain same duration for audio and video, with the videos that i'm using for testing i get always 6 ms more for audio track. May ask help to debug it and understand how to get same duration for both audio and video track? #!/bin/bash #CANCAT 0.3 cd input fps=() # GET FPS OF EACH VIDEO INTO ARRAY for f in *.mp4; do _f=$(ffmpeg -i "$f" 2>&1 | sed -n "s/.*, \\\\(.*\\\\) fp.*/\\\\1/p") fps+=("$_f") done #GET NUMBER OF ELEMENTS IN FPS ARRAY tLen=$#fps[ⓐ] #CHECK FPS EQUALITY for tLen in (...) -- https://gofile.io/?c=WPAC0Q
• 20:01
  How to read the timecode from a DPX file via Python - Mike McReynolds Newest 'ffmpeg' Questions - Stack Overflow
  As part of a larger script, I need to be able to read the timecode off of a DPX file. I have ffmpeg and ffprobe, but I'm a beginner when it comes to using those programs. For MOV files, I was able to cobble this together: def GetStartingTimecodeFromMOV(Filename): cmd = "ffprobe -v quiet -print_format json -show_streams -show_format" args = shlex.split(cmd) args.append(Filename) String = subprocess.check_output(args).decode('utf-8') for Line in String.split("\\n"): if Line.count("timecode"): Timecode = Line.split("\\"")[3] return Timecode ...but their must be some subtle difference in the (...)
• 18:50
  Playing incoming video stream via FFMPEG (C#) - Ahmad45123 Newest 'ffmpeg' Questions - Stack Overflow
  I'm building an application that captures computer screen in realtime and pushes it over to a remote application via sockets for viewing.. I play the video using ffmpeg (with bindings for c#) with a custom IO context that reads from the socket directly. The issue I'm having is that ffmpeg for some reason keeps assuming random video lengths like sometimes 0.256s, sometimes 10s, sometimes 3s whatever.. Message similar to this: VIDEO - Start Time: 0.000; Duration: 0.251 Timing Offsets - Main Component: Video; Start Time: 0.000; Duration: 0.251; Then it stops playing after this time.. How (...)
• 18:43
  VLC - Transcoding a 4k Picture to a Transport Stream - gdogg371 Newest 'ffmpeg' Questions - Stack Overflow
  After a lot of crying, stamping my feet and pulling my hair out, I have now managed to transcode my 4k capture card into an RTP MPEG2 transport stream using VLC, as per the below: vlc dshow:// :dshow-vdev="Video (00 Pro Capture HDMI 4K+)" :dshow-adev="Audio (2- 00 Pro Capture HDMI 4K+)" :dshow-threads=8 :dshow-aspect-ratio=16\\:9 :dshow-size="2160x1080" :dshow-pixel_format=NV12 :dshow-tune=film :dshow-preset=veryslow :dshow-vcodec=hevc_nvenc :dshow-fps=50 :dshow-crf=0 :dshow-acodec=mp4a :dshow-stereo-mode=5 :dshow-force-surround-sound=0 :dshow-ab=128 :dshow-samplerate=44100 (...)
• 18:43
  Opencv How to Overlay Text on Video with audio file and audio and text should be in sync - vinay kumar Newest 'ffmpeg' Questions - Stack Overflow
  I am new to OpenCV. I have created a video with text and image. it's working fine. but when I am trying to add audio to the file then audio is not getting sync with the text. I am using OpenCV and FFmpeg. also tried MoviePy but did not work. class CreateVideoFromMP3AndText(object): default_path = "new_filename.mp4" def __init__(self, text, audio, video=None): self.text = text self.audio = audio self.video = video def get_paragraphs(self): return tokenize.sent_tokenize(self.text) def convert_image_2_video(self): img_array = [] for text in self.get_paragraphs(): for filename in (...)
• 17:51
  JavaFX MediaPlayer unable to play local m3u8 file - Lennart Newest 'ffmpeg' Questions - Stack Overflow
  I want to show a live stream of a web cam in my JavaFX application using the MediaPlayer/MediaView. My attempt was to use ffmpeg to record a HLS and to play the resulting m3u8 file, but that throws the following exception (VLC plays the video without problems): MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player! at javafx.scene.media.MediaException.exceptionToMediaException(MediaException.java:146) at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:511) at (...) -- requirements, this
• 15:53
  Merge a sequence of JPEG images into a grid losslessly with FFmpeg - Mody Newest 'ffmpeg' Questions - Stack Overflow
  I have a sequence of images that are blocks of a larger image, which together make up the whole image. The blocks are the result of splitting the original image along evenly spaced horizontal and vertical lines, so they don't have weird dimensions. Is there a way to combine them with FFmpeg (or something else like ImageMagick) without re-encoding the images? This answer suggests the hstack or vstack FFmpeg filter, but my image blocks aren't necessarily the full width or the full height of the original image. Like this: Perhaps this could be achieved with multiple FFmpeg commands (...)
• 15:23
  H.264 to DNxHR 444 issue. Colors are not transcoded correctly (HDR project) - Raulo1985 Newest 'ffmpeg' Questions - Stack Overflow
  I'm having an issue transcoding a H.264 UHD HDR file to a DNxHR file in a mxf container with FFmpeg. The issue is that both files don't look the same at all, the colors look washed out on the DNxHR video, and I tried to make the transcoding as lossless as possible (DNxHR 444 flavor). The original file is a movie I ripped a while ago, H.264, UHD, HDR, in a mkv container. My goal: to create an almost lossless DNxHR file to use it as source file in Adobe Premiere Pro, and use another DNxHR file with less quality as proxy for editing. I wanted to do it that way and not use the original H.264 (...)
• 14:47
  Watch multi-stream video file while being recorded by ffmpeg - Luke Gorrie Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to record four 1080p video streams simultaneously and I would like to view these streams in real time while they are being recorded. Ideally I would like to view them from a separate machine, using some convenient Linux data sharing method like ssh/sshfs/..., but that is a nice-to-have. Is there a practical way to accomplish this? The ffmpeg recording command that I currently use is like this: ffmpeg \\ -f v4l2 -i $cam0 \\ -f v4l2 -i $cam1 \\ -f v4l2 -i $cam2 \\ -f v4l2 -i $cam3 \\ -f matroska \\ -map 0 \\ -map 1 \\ -map 2 \\ -map 3 \\ -c copy \\ $output.mkv My problem would be (...)
• 14:28
  libav ffmpeg - streaming from both a mkv and input stream - kealist Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use ffmpeg libraries in C# with AutoGen bindings. The overall issue is that I am taking a collection of sources, some streams, and some .mkv containing recordings of a stream. As for now, they are all h264 and only video. For input streams, I am able to adjust the packets and broad cast them and that works fine, but any time I try to call av_interleaved_write_frame with packets from the MKV file, I get the error Error occurred: Invalid data found when processing input. Here is the main loop, where the error happens for mkv files. Is there an extra step? /* read all packets (...)
• 11:45
  ffmpeg how to reduce bass and increase treble like audacity - Santhosh Yedidi Newest 'ffmpeg' Questions - Stack Overflow
  I have an mp3 file. I want to reduce bass and increase treble. I am trying: ffmpeg -y -i original.mp3 -af "treble=g=10" test1.mp3 but its not same as the effect of Audacity->Effect->bass and treble (increase treble and reduce bass) below is the image from audacity: --
• 03:42
  PowerShell doesn't recognize string correctly - fdroid Newest 'ffmpeg' Questions - Stack Overflow
  I'm passing a command to powershell Dim command As String command = "ffmpeg -vsync 0 –hwaccel cuvid -c:v h264_cuvid –resize 1280x720 -i D:\\Imagens\\nova\\bol.mkv -c:a copy -c:v h264_nvenc -b:v 5M D:\\Imagens\\nova\\bol_encod.mkv" with Dim powerShell As String = "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe" Process.Start("powershell", "-noexit " + command) but powershell returns Unable to find a suitable output format for 'ÔÇôhwaccel' ÔÇôhwaccel: Invalid argument where I believe 'ÔÇôhwaccel' to be –hwaccel; That's completely strange, once when I past the code directly on PowerShell it (...)