ffmpeg throwing "Non-monotonous DTS in output stream"

So I'm trying to concatenate 3 video files. I'm running Linux, and the command line looks like this:

ffmpeg -f concat -safe 0 -i blist.txt -c copy output.mp4

blist.txt contains this:

file 'btest/00 - Test Pattern.mp4'
file 'btest/01 - In Memoriam.mp4'
file 'btest/EndLoop.mp4'

Soon as it starts processing the second file, it throws errors like this, but continues running:

Non-monotonous DTS in output stream 0:0;

The resulting file should be 4:13 long, but ends up being 9:57 long. First clip plays perfectly, but after that, it's all black screen with the right audio for the remaining 4:13, then silence.

I know I need to re-encode all the files, but I have no idea what parameters to use.

Details about each input and ffmpeg:

ffmpeg version N-92086-gd702769 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --disable-x86asm
  libavutil      56. 19.101 / 56. 19.101
  libavcodec     58. 31.102 / 58. 31.102
  libavformat    58. 18.103 / 58. 18.103
  libavdevice    58.  4.105 / 58.  4.105
  libavfilter     7. 33.100 /  7. 33.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'upload/00 - Test Pattern.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.40.101
  Duration: 00:02:26.87, start: 0.000000, bitrate: 243 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 106 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'upload/01 - In Memoriam.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.40.101
  Duration: 00:01:32.07, start: 0.000000, bitrate: 219 kb/s
    Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 82 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'upload/99 - End Loop.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.40.101
  Duration: 00:00:15.05, start: 0.000000, bitrate: 236 kb/s
    Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 99 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified

Can someone please help me with this?

cwinthrop

Posted 2018-09-30T13:44:01.537

Reputation: 11

Does it have to be mp4 or could you perhaps use mkv? You need to keep in mind that you can’t always concatenate audio/video streams. – Daniel B – 2018-09-30T14:40:18.967

It doesn't have to be, but it would be ideal. – cwinthrop – 2018-09-30T15:09:51.790

Show the complete output of ffmpeg -i "00 - Test Pattern.mp4" -i "01 - In Memoriam.mp4" -i "EndLoop.mp4" – llogan – 2018-09-30T17:48:14.537

@LordNeckbeard It's too long to paste here. https://paste.ee/p/d7QEr

– cwinthrop – 2018-09-30T22:16:16.120

What player are you using? How did you create the files? Looking at the console output I don't see anything obviously wrong, maybe I missed something, but perhaps if you provide a link to the input files I can take a closer look. – llogan – 2018-10-01T19:56:35.157

Problem was just fixed about 15 minutes ago by converting the files to .mkv using this command:

ffmpeg -i "input/$t.mp4" -c:a copy -c:v copy "output/$o.mkv" – cwinthrop – 2018-10-01T20:26:32.810

ffmpeg throwing "Non-monotonous DTS in output stream"

Answers