[FFmpeg-trac] #6426(avformat:new): Muxing using av_interleaved_write_frame() does not interleave

[FFmpeg]

#6426: Muxing using av_interleaved_write_frame() does not interleave
----------------------------------+--------------------------------------
             Reporter:  DeHackEd  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:

 When using av_interleaved_write_frame (or just ffmpeg straight up, since
 ffmpeg uses av_interleaved_write_frame) output packets are not sorted
 properly into the output. The dts in the output file skips around. This
 can be viewed with ffprobe or wireshark when using MPEG-TS output.

 How to reproduce:
 {{{
 % ./ffmpeg -y -i input.mp4 -t 20 -c copy -f mpegts output-copy.ts
 ffmpeg version N-86315-g0dea011 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-libx264 --extra-cflags='-Iarch=westmere'
 --enable-gpl --enable-nonfree --enable-libfreetype
 --cc=/opt/gcc-6.3.0/bin/gcc
   libavutil      55. 63.100 / 55. 63.100
   libavcodec     57. 96.101 / 57. 96.101
   libavformat    57. 72.101 / 57. 72.101
   libavdevice    57.  7.100 / 57.  7.100
   libavfilter     6. 90.100 /  6. 90.100
   libswscale      4.  7.101 /  4.  7.101
   libswresample   2.  8.100 /  2.  8.100
   libpostproc    54.  6.100 / 54.  6.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf57.72.101
   Duration: 00:23:12.22, start: 0.000000, bitrate: 5313 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 4924 kb/s, 29.97 fps, 29.97
 tbr, 10000k tbn, 59.94 tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side),
 fltp, 384 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Side data:
       audio service type: main
 Output #0, mpegts, to 'output-copy.ts':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf57.72.101
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 4924 kb/s, 29.97 fps, 29.97 tbr, 90k
 tbn, 10000k tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side),
 fltp, 384 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Side data:
       audio service type: main
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=  600 fps=0.0 q=-1.0 Lsize=    7796kB time=00:00:19.98
 bitrate=3195.4kbits/s speed= 166x
 video:6165kB audio:938kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 9.759675%

 % ffprobe -show_packets output-copy.ts | egrep 'dts_time=|codec_type='
 ...
 dts_time=19.918467
 codec_type=audio
 dts_time=19.960367
 codec_type=video
 dts_time=19.951833
 codec_type=audio
 dts_time=19.992367
 codec_type=video
 dts_time=19.985200
 codec_type=audio
 dts_time=20.024367
 codec_type=video
 dts_time=20.018567
 codec_type=audio
 dts_time=20.056367
 codec_type=video
 dts_time=20.051933
 codec_type=audio
 dts_time=20.088367
 codec_type=video
 dts_time=20.085300
 codec_type=audio
 dts_time=20.120367
 codec_type=audio
 dts_time=20.152367
 codec_type=video
 dts_time=20.118667
 codec_type=audio
 dts_time=20.184367
 codec_type=video
 dts_time=20.152033
 codec_type=audio
 dts_time=20.216367
 codec_type=video
 dts_time=20.185400
 codec_type=audio
 dts_time=20.248367
 codec_type=video
 dts_time=20.218767
 ...

 }}}

 dts_time should be monotonically increasing even with the intermixed
 codec_types. Instead each stream is independently increasing but globally
 the dts is out of order.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6426>
FFmpeg <https://ffmpeg.org>
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