Wrong duration in program streams with timestamp discontinuity

[Carl Eugen Hoyos]

A user provided a 2.9 G DVD rip that shows a duration of "00:00:01.06" and a bitrate of "-2147483 kb/s" with ffmpeg -i. The reason is a timestamp discontinuity approximately 1 sec before the end of the stream. I cut the sample to only contain the last seconds, and the duration is also wrong, the bitrate is shown as 0kb/s.

$ ffmpeg -i negative-bitrate-sample.mpg
ffmpeg version N-48311-gc36302a Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 30 2012 19:01:34 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-avresample
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 81.100 / 54. 81.100
  libavformat    54. 50.104 / 54. 50.104
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 30.102 /  3. 30.102
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 0x1ed7540] max_analyze_duration 5000000 reached at 5000000
Input #0, mpeg, from 'negative-bitrate-sample.mpg':
  Duration: 00:00:01.06, start: 0.287267, bitrate: -2147483 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    Stream #0:2[0x23]: Subtitle: dvd_subtitle
At least one output file must be specified

$ ffmpeg -probesize 2147483647 -analyzeduration 2147483647 -i ../MPlayer/negative-bitrate-sample.mpg
ffmpeg version N-48311-gc36302a Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 30 2012 19:01:34 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-avresample
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 81.100 / 54. 81.100
  libavformat    54. 50.104 / 54. 50.104
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 30.102 /  3. 30.102
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 0x17c0720] max_analyze_duration 2147483647 reached at 2147520000
Input #0, mpeg, from '../MPlayer/negative-bitrate-sample.mpg':
  Duration: 00:00:01.06, start: 0.287267, bitrate: -2147483 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    Stream #0:2[0x23]: Subtitle: dvd_subtitle
    Stream #0:3[0x21]: Subtitle: dvd_subtitle
    Stream #0:4[0x20]: Subtitle: dvd_subtitle
    Stream #0:5[0x22]: Subtitle: dvd_subtitle
At least one output file must be specified

$ ffmpeg -i negative-bitrate-sample_cut.mpg
ffmpeg version N-48311-gc36302a Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 30 2012 19:01:34 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-avresample
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 81.100 / 54. 81.100
  libavformat    54. 50.104 / 54. 50.104
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 30.102 /  3. 30.102
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg2video @ 0x2b72f80] mpeg_decode_postinit() failure
    Last message repeated 4 times
[mpeg @ 0x2b6c540] DTS discontinuity in stream 1: packet 76 with DTS 343638654, packet 77 with DTS 8589956846
[mpeg @ 0x2b6c540] DTS discontinuity in stream 0: packet 104 with DTS 343641534, packet 105 with DTS 8589960446
Input #0, mpeg, from 'negative-bitrate-sample_cut.mpg':
  Duration: 25:27:10.12, start: 3814.943267, bitrate: 0 kb/s
    Stream #0:0[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x20]: Subtitle: dvd_subtitle
    Stream #0:3[0x21]: Subtitle: dvd_subtitle
    Stream #0:4[0x22]: Subtitle: dvd_subtitle
    Stream #0:5[0x23]: Subtitle: dvd_subtitle
At least one output file must be specified

[Carl Eugen Hoyos]

The negative bitrate is not shown anymore, the duration is still incorrect, ticket #2894 probably describes the same issue.

$ ffmpeg -i negative-bitrate-sample.mpg -f null -
ffmpeg version N-55734-g9e477a3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug 23 2013 19:36:08 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --disable-indev=jack
  libavutil      52. 42.100 / 52. 42.100
  libavcodec     55. 29.100 / 55. 29.100
  libavformat    55. 14.102 / 55. 14.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 82.102 /  3. 82.102
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mpeg, from 'negative-bitrate-sample.mpg':
  Duration: 00:00:01.06, start: 0.287267, bitrate: N/A
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], max. 8400 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    Stream #0:3[0x23]: Subtitle: dvd_subtitle
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf55.14.102
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 25 tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, 5.1(side), s16, 4608 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg2video -> rawvideo)
  Stream #0:2 -> #0:1 (ac3 -> pcm_s16le)
Press [q] to stop, [?] for help
[mpeg2video @ 0x3142ee0] warning: first frame is no keyframe
[null @ 0x3142340] Encoder did not produce proper pts, making some up.
[mpeg2video @ 0x3142ee0] warning: first frame is no keyframe
[mpeg @ 0x3140880] New subtitle stream 0:4 at pos:20676622 and DTS:27.2873s
[mpeg @ 0x3140880] New subtitle stream 0:5 at pos:82606094 and DTS:106.967s
[mpeg @ 0x3140880] New subtitle stream 0:6 at pos:82792462 and DTS:107.127s
frame=95478 fps=1922 q=0.0 Lsize=N/A time=01:03:39.12 bitrate=N/A
video:8951kB audio:2148228kB subtitle:0 global headers:0kB muxing overhead -100.000001%

[Rapper_skull]

This just happened to me when trying to read a BD playlist.

It is composed of two m2ts files, one containing the entire movie, and the second one being just 0.5 seconds long. ffprobe gave me a length of 25 hours.

I had to use the main m2ts file as input to fix it, and it was not a big deal, but it can become a problem if the playlist is actually composed of "real" m2ts files with a discontinuity between them.