non monotonically increasing dts - skip badly broken subtitles

[Evren Yurtesen]

Summary of the bug:

I have problems with subtitles in dvb streams with ffmpeg 3.2.4

[mpegts @ 0x55a081ad1220] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 186981224 >= 186884791
av_interleaved_write_frame(): Invalid argument

Due to the large difference in positions, I expect there is a problem in the subtitle stream.

I tried the -fix_sub_duration option and it does not help. So I am thinking the issue is not related to previous subtitle duration being too long.

I think a solution would be skipping broken subtitles with a warning instead of exiting with conversion failed error. I would rather lose some apparently not working subtitles than conversion being stopped. Is this possible?

I used dd to cut to the position where the problem is.

Command:
# /usr/bin/ffmpeg -y -fix_sub_duration -i /tmp/vera.ts -c:s copy /tmp/vera2.ts

Error:
[mpegts @ 0x55ee74fb22c0] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 281690 >= 7438

[Evren Yurtesen]

sample file causing problem...

[Carl Eugen Hoyos]

Please test current FFmpeg git head and provide the command line that allows to reproduce the issue together with the complete, uncut console output to make this a valid ticket.

[Evren Yurtesen]

Please ignore the invalid frame dimensions errors. They are probably due to me cutting the file very small using dd.

The actual problem is:

[mpegts @ 0x207a760] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 281690 >= 7438 av_interleaved_write_frame(): Invalid argument

Full output:

$ ./ffmpeg -y -fix_sub_duration -i vera.ts -c:s copy vera2.ts
ffmpeg version N-84156-g23f3f92 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  configuration: 
  libavutil      55. 48.100 / 55. 48.100
  libavcodec     57. 83.100 / 57. 83.100
  libavformat    57. 66.104 / 57. 66.104
  libavdevice    57.  3.100 / 57.  3.100
  libavfilter     6. 77.100 /  6. 77.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
[mp3 @ 0x20400c0] Header missing
[mp3 @ 0x207b920] Header missing
[mpeg2video @ 0x203eee0] Invalid frame dimensions 0x0.
    Last message repeated 10 times
[mpegts @ 0x203a400] PES packet size mismatch
    Last message repeated 5 times
Input #0, mpegts, from 'vera.ts':
  Duration: 00:00:02.16, start: -2.867556, bitrate: 877 kb/s
  Program 17 
    Stream #0:0[0x200]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x28a](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s
    Stream #0:2[0x403](fin): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:3[0x1388](fin): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  No Program
    Stream #0:4[0x28c]: Audio: mp2, 48000 Hz, stereo, s16p, 160 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  Stream #0:1 -> #0:1 (mp2 (native) -> mp2 (native))
  Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
[mp2 @ 0x207c2e0] Header missing
Error while decoding stream #0:1: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg2video @ 0x207be00] Invalid frame dimensions 0x0.
Error while decoding stream #0:0: Invalid data found when processing input
[mpegts @ 0x203a400] PES packet size mismatch
[mpeg2video @ 0x207be00] ac-tex damaged at 16 0
[mpeg2video @ 0x207be00] Warning MVs not available
[mpeg2video @ 0x207be00] concealing 1620 DC, 1620 AC, 1620 MV errors in I frame
Output #0, mpegts, to 'vera2.ts':
  Metadata:
    encoder         : Lavf57.66.104
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 90k tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.83.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    Stream #0:1(eng): Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
    Metadata:
      encoder         : Lavc57.83.100 mp2
    Stream #0:2(fin): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
[mpegts @ 0x207a760] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 281690 >= 7438
av_interleaved_write_frame(): Invalid argument
frame=    0 fps=0.0 q=0.0 Lsize=      37kB time=00:00:03.12 bitrate=  95.6kbits/s speed=36.2x    
video:0kB audio:28kB subtitle:4kB other streams:0kB global headers:0kB muxing overhead: 13.177638%
Conversion failed!

[Hans Carlson]

FYI. The suggested change in ​https://trac.ffmpeg.org/ticket/4450 also appears to fix this issue.

[Evren Yurtesen]

@forbyta will that change ever be included in a release? that report is 2+ years old.

[Carl Eugen Hoyos]

The patch from ticket #4450 was applied as a790813739a880a0a86084ec8c4e2d5a6a79c11d