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• ffmpeg is detecting a shorter stream duration than my video player is causing encoding to stop too early

  20 novembre 2019, par Kabir

  I have an mp4 that was saved from corruption using recover_mp4

  The audio, however was ruined (but that’s ok) and the duration of the file is 34 hours long (it’s supposed to be closer to 8h 30m). When I open the video in mpv I can scrub through and watch the video (all 8 hours and 30 minutes are there, normal playback) and the rest of the time is just a black screen.

  So in an effort to extract the video I ran it though ffmpeg with the following :

  ffmpeg -i input.mp4 -an -c:v libx264 -crf 18 -preset slow -f mp4 output.mp4

  But after 5h30m ffmpeg just stopped. No errors, it was just done. So I went back in with this command to see what was wrong :

  ffmpeg -loglevel verbose -ss 05:30:00 -t 00:03:00 -i input.mp4 -an -c copy output.mp4

  Which gives me the following log and tells me "No more output streams to write to, finishing."

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'J:\Projects\Recovered\input.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.20.100
  
    Duration: 34:28:24.70, start: 0.000000, bitrate: 9807 kb/s
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt709/bt709, left), 1920x1080 (1920x1088) [SAR 1:1 DAR 16:9], 38945 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 67 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'J:\Projects\Recovered\output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.22.100
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt709/bt709, left), 1920x1080 (0x0) [SAR 1:1 DAR 16:9], q=2-31, 38945 kb/s, 60 fps, 60 tbr, 15360 tbn, 15360 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.e=00:02:58.31 bitrate=47090.3kbits/s speed=4.82x     125x
  
  frame=10921 fps=292 q=-1.0 Lsize= 1035963kB time=00:02:59.98 bitrate=47152.2kbits/s speed=4.81x
  
  video:1035907kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005471%
  
  Input file #0 (J:\Projects\Recovered\input.mp4):
  
    Input stream #0:0 (video): 10922 packets read (1060899674 bytes);
  
    Input stream #0:1 (audio): 0 packets read (0 bytes);
  
    Total: 10922 packets (1060899674 bytes) demuxed
  
  Output file #0 (J:\Projects\Recovered\output.mp4):
  
    Output stream #0:0 (video): 10921 packets muxed (1060768411 bytes);
  
    Total: 10921 packets (1060768411 bytes) muxed
  
  [AVIOContext @ 000001d426143200] Statistics: 2 seeks, 4050 writeouts
  
  [AVIOContext @ 000001d426143e80] Statistics: 1130774976 bytes read, 1 seeks

  SO now I’m confused, the input file plays back all 8 hours if I open in it my video viewer, but ffmpeg is detecting a shorter video stream than is really on there. Here is the log I get from checking stream duration :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'J:\Projects\Recovered\input.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.20.100
  
    Duration: 34:28:24.70, start: 0.000000, bitrate: 9807 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt709/bt709), 1920x1080 [SAR 1:1 DAR 16:9], 38945 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 67 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  stream|duration=20111.950000
  
  stream|duration=20111.915000

  So it’s detecting a duration of about 5h30m according to that. I’m not really sure what next steps I should take from here or why ffmpeg is telling me my streams are shorter than they really are. Any help would be appreciated !

• Revision c29c613400 : Merge "vp8enc : Prevent out of bounds memory access."

  28 janvier 2015, par Alex Converse

  Merge "vp8enc : Prevent out of bounds memory access."

• Revision c0856b98cc : Merge "Fixing out of bounds access in frame_refs[] array."

  30 janvier 2014, par Yaowu Xu

  Merge "Fixing out of bounds access in frame_refs[] array."