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• Building A livestreaming server like youtube from scratch

  9 décembre 2022, par Dipo Ahmed

  I am trying to build a live streaming server like youtube where I can watch the video live or if I want to I can play the video from any duration I want.

  


  What I have tried so far.
I have built a node js WebSocket server where I push the video blob that I receive from the browser via MediaRecorder API every 2 seconds. This blob is then getting converted to hls by a ffmpeg process which generates 2 seconds *.ts files and a .m3u8 file which I am playing with video.js in browser.

  


  This is my ffmpeg command

  


   spawn('ffmpeg', [
        '-i', '-',
        // '-re',
        '-fflags', '+igndts',

        '-vcodec', 'h264',
        '-acodec', 'aac',

        '-preset', 'slow',
        '-crf', '22',
        // You can also use QP value to adjust output stream quality, e.g.: 
        // '-qp', '0',
        // You can also specify output target bitrate directly, e.g.:
        '-b:v', '1500K',
        '-b:a', '128K', // Audio bitrate

        '-f', 'hls',
        '-hls_time', '1',
        // '-hls_playlist_type', 'vod',
        '-hls_list_size', '2',
        '-hls_flags', 'independent_segments',
        '-hls_segment_type', 'mpegts',
        '-hls_segment_filename', `${path}/stream%02d.ts`, `${path}/stream.m3u8`,
    ]);


  


  The problem is that the video js player duration is not updating like in youtube where the video duration increases every second.

  


  Any direction will be appreciated. Please tell me if my approach is wrong and what needs to be learned for me to build this system.

  


• lavu/hwcontext_qsv : Make sure hardware vendor is Intel for qsv on d3d11va

  28 novembre 2023, par Haihao Xiang

  lavu/hwcontext_qsv : Make sure hardware vendor is Intel for qsv on d3d11va
  When multiple hardwares are available, the default one might not be
  
  Intel Hardware. We can use option vendor_id to choose the required
  
  vendor.
  Tested-by : Artem Galin <artem.galin@intel.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/hwcontext_qsv.c

• avformat/hlsenc : limit segments count to search duplicated segments filenames

  26 juillet, par Artem Smorodin

  avformat/hlsenc : limit segments count to search duplicated segments filenames
  This linear search has a complexity of O(n). When ffmpeg attempts to parse a playlist containing approximately 100,000 segments, it effectively causes a hang for several minutes.
  This patch limits the allowed size for duplicate searches to a reasonable value. Now it takes between 0.5 and a few seconds (tested on different devices) instead of several minutes.
  Signed-off-by : Artem Smorodin <artem.smorodin@dacast.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hlsenc.c