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• Issue playing output mp4 transcoded with ffmpeg wasm on mobile

  14 mars 2023, par heroicsatsuma

  I'm capturing a video of a canvas using MediaRecorder :

  


  (async () => {
    const stream = recordingCanvasCtx.canvas.captureStream();
    const chunks = [];
    videoRecorder.ondataavailable = e => chunks.push(e.data);
    videoRecorder.onstop = async () => {
        transcode(new Uint8Array(await (new Blob(chunks)).arrayBuffer()));
        stopRecording();
    };
    videoRecorder.start();
    setTimeout(() => {
        videoRecorder.stop();
    }, videoRecordDuration);
})();


  


  Then transcoding using ffmpeg wasm :

  


  const transcode = async (webcamData) => {
    const name = 'record.webm';

    ffmpeg.FS('writeFile', name, await fetchFile(webcamData));
    await ffmpeg.run('-i', name, '-codec', 'copy', '-preset', 'superfast', '-crf', '27', 'output.mp4');

    const data = ffmpeg.FS('readFile', 'output.mp4');

    const video = document.getElementById('vidpreview');
    video.src = URL.createObjectURL(new Blob([data.buffer], { type: 'video/mp4' }));

    document.getElementById('viddiv').classList.add("show");

    vidpreview.onloadeddata = function () {
        playBtn.addEventListener('click', playVidAgain);
    }
}


  


  This all works and displays when running on a Windows laptop, but when trying to display the video.src on Android I see the following error in chrome ://inspect :

  


  ERR_REQUEST_RANGE_NOT_SATISFIABLE

  


  Any ideas how to get this working are much appreciated

  


• avfilter/vf_vpp_qsv : set outlink to EOF correctly

  12 mai 2022, par Fei Wang

  avfilter/vf_vpp_qsv : set outlink to EOF correctly
  1. Return error if filter frame fail before set outlink to EOF in none
  
  pass through mode.
  
  2. Set outlink to EOF before return success in pass through mode.
  Fix endless cmd :
  ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD128 -hwaccel_output_format     \
  
  qsv -v debug -c:v hevc_qsv -i 4k.h265                                          \
  
   filter_complex "vpp_qsv=w=3840:h=2160:async_depth=4[o1] ;[o1]split=2[s1][s2] ;
  
  [s2]vpp_qsv=w=1920:h=1080:async_depth=4[o2] ;[o2]split=2[s3][s4] ;
  
  [s4]vpp_qsv=w=1920:h=1080:async_depth=4[o3]" \
  
   map [s1] -c:v hevc_qsv -async 3 -async_depth 3 -b:v 9000k -preset 7 -g 33 -y -f null - \
  
   map [s3] -c:v hevc_qsv -async 3 -async_depth 3 -b:v 4000k -preset 7 -g 33 -y -f null - \
  
   map [o3] -c:v hevc_qsv -async 3 -async_depth 3 -b:v 3100k -preset 7 -g 33 -y -f null -
  

  • [DH] libavfilter/vf_vpp_qsv.c

• osx ffmpeg avfoundation audio not in sync

  29 avril 2015, par Chris Whittington

  I’m trying to record my screen audio and video with ffmpeg. I have installed soundflower successfully and setup the correct audio devices. However, when using ffmpeg the audio is sped up and does not keep in sync with the video.

  ffmpeg -f avfoundation -i "1:0" -y out.avi

  I have also tried the following variations.

  ffmpeg -vsync 2 -f avfoundation -i "1:0" -framerate 30 -y out.avi
  
  
  
  ffmpeg -vsync 2 -f avfoundation -i "1:0" -frame_rate 30 -probesize 10M  -y out.avi
  
  
  
  ffmpeg -async 1 -probesize 10M -f avfoundation -i "1:0" -r 15  -y out.avi
  
  
  
  ffmpeg -async 15 -f avfoundation -i "1:0" -r 15  -y out.avi

  I’m using ffmpeg version 2.6.2 installed via homebrew.

  If someone has a free solution that isn’t ffmpeg that works well from the command line then i will also accept that. Quicktime screen recording produces very large file sizes so it’s not appropriate.