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• avformat/flacdec : Also set channels when setting channel_layout

  29 août 2021, par Andreas Rheinhardt

  avformat/flacdec : Also set channels when setting channel_layout
  This brings the FLAC demuxer in line with all the other demuxers.
  
  Furthermore, if it is not done and the FLAC decoder is disabled,
  
  the FLAC parser will overwrite the channel layout with the standard
  
  channel layout for that number of channels.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/flacdec.c

• Why FFmpeg is consuming more and more bandwith when restreaming a YouTube HLS stream ?

  3 janvier 2023, par NiHuShu

  I've been creating a bot in Python which allows to copy one YouTube livestream and stream it to another channel using the HLS protocol.

  


  This is the command I'm using in Python to start the FFmpeg process :

  


  m3u8_url = streamlink.streams(stream_url)['1080p'].url
ffmpeg_process = Popen(
    ["ffmpeg", "-i", m3u8_url, "-c", "copy","-ignore_io_errors", "1", "-f", "hls", "-http_persistent", "1", '-attempt_recovery', '1',
    '-method', 'POST', '-hls_time', '1', '-hls_playlist_type', 'event', '-g', '5', '-reconnect_at_eof', '1',
    'https://a.upload.youtube.com/http_upload_hls?cid=' + stream_key + '&copy=0&file=stream.m3u8'])


  


  I'm using streamlink to extract the 1080p m3u8 playlist of a given livestream and then using "-c", "copy"I'm just passing the raw HLS stream back to YouTube servers.

  


  The problem is that at first FFmpeg is using around 1.5 Mbps for both upload and download, but as the stream progresses the used bandwidth per second grows substantially. After 5 hours FFmpeg uses 5 Mbps of upload and about half of that in download, but it just keeps on growing. It's gotten to a point where my VPS was blocked as after a few days it was using > 1500 Mbps of bandwidth (with 10 active streams).

  


  The only thing that comes to my mind is that for some reason with every .ts segment, FFmpeg is trying to send all the previous ones as well. It might be worth mentioning that YouTube Studio is complaining that the incoming stream bandwith is too low and it should be 4.5 Mbps.

  


  I've tried changing the "-method" from PUT to POST, which helped reducing the download bandwidth, but didn't change anything in regards to upload.

  


• ffmdec : make sure the time base is valid

  8 mars 2015, par Andreas Cadhalpun

  ffmdec : make sure the time base is valid
  A negative time base can trigger assertions.
  Signed-off-by : Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/ffmdec.c