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• ffmpeg incorrect duration when converting video to HLS

  12 octobre 2016, par Julie Bsd

  I’m facing an issue using ffmpeg to convert video, precisely mp4 video => Http Live Streaming (HLS)

  Once converted to HLS, the .m3u8 file has a wrong duration (e.g : 20,1s instead of 20.00s), causing bugs when playing it with AVPlayer on iOS.
  Playing the video with Safari cause the same issue.

  Example :
  1) Open Safari
  2) Play this video that i’ve converted
  3) Look at the download progression, stopped at 98% cause of wrong duration.
  
  4) When you slide between 98% and 100%, the video player can crash.

  ---

  EDIT 1 :

  I’ve edited the command line

   ffmpeg -i  video.mp4 \
  
   -codec copy \
  
   -acodec copy \
  
   -map 0 -f ssegment -g 60 -sc_threshold 0 \
  
   -segment_list playlist.m3u8 \
  
   -segment_list_flags +live \
  
   -segment_time 2 media%05d.ts \
  
    >./log_ffmpeg 2>./log_ffmpeg

  LOG :

  ffmpeg version 3.1.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-2) 20160904
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libzimg --cc=gcc-5 --disable-ffplay
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Comptes/1/Photos/306/original_video.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      creation_time   : 2016-10-12 14:29:51
  
    Duration: 00:00:20.00, start: 0.000000, bitrate: 1673 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, 1563 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 101 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Audio
  
  [stream_segment,ssegment @ 0x652ed80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  
  
  Output #0, stream_segment,ssegment, to './Comptes/1/Photos/306/media%05d.ts':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      encoder         : Lavf57.41.100
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, q=2-31, 1563 kb/s, 30 fps, 30 tbr, 90k tbn, 600 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, 101 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Audio
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  601 fps=0.0 q=-1.0 Lsize=N/A time=00:00:20.10 bitrate=N/A speed= 917x    
  
  video:3823kB audio:249kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  m3u8 file :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:3
  
  #EXTINF:2.033333,
  
  media00000.ts
  
  #EXTINF:2.000000,
  
  media00001.ts
  
  #EXTINF:2.000000,
  
  media00002.ts
  
  #EXTINF:2.000000,
  
  media00003.ts
  
  #EXTINF:2.000000,
  
  media00004.ts
  
  #EXTINF:2.000000,
  
  media00005.ts
  
  #EXTINF:2.000000,
  
  media00006.ts
  
  #EXTINF:2.000000,
  
  media00007.ts
  
  #EXTINF:2.000000,
  
  media00008.ts
  
  #EXTINF:2.000000,
  
  media00009.ts
  
  #EXTINF:0.033333,
  
  media00010.ts
  
  #EXT-X-ENDLIST

  As you can see input duration =/= output duration
  input duration : 20s
  output duration 20.1s

• Restreaming mpd to m3u8 loads CPU, any solution ?

  5 avril 2020, par Marhul88

  i restream channels from mpd to m3u8 but it loads cpu very much. Is any soliton to restream mpd streams easily ?

  



  This is code :

  



  [program:channel]
autorestart=true
command=/usr/local/ffmpeg/bin/ffmpeg -re -hide_banner -headers 'Referer: https://example.com/' -i https://stream.webm.mpd -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -b:a 128k -f hls -hls_time 4 -hls_flags append_list+delete_segments -hls_list_size 6 -hls_segment_filename '/etc/nginx/hls/channel/file%%03d.ts' /etc/nginx/hls/channel/playlist.m3u8


  


• How to calculate bitrate of lower resolution videos created from high resolution video ?

  4 avril 2020, par Ryosuke

  I am trying to implement HLS video using ffmpeg. Suppose I have a video with following specs :

  



  1080x1920 bitrate: 20971649


  



  Now I have to write a command to convert it to for example : 720p. So now the actual converted video by ffmpeg has bitrate : 760808.

  



  Is there a way that I can know this bitrate before hand, so that I can include in the master playlist correctly ?