Carl Eugen Hoyos <[email protected]> added the comment:

incoming/[Frostii]_Summer_Wars_[720p][9B12BBFA]-ffplay-desync-clip.mkv is
another sample:

ffmpeg -i \[Frostii\]_Summer_Wars_\[720p\]\[9B12BBFA\]-ffplay-desync-clip.mkv
-acodec copy test.aac
FFmpeg version SVN-r22741, Copyright (c) 2000-2010 the FFmpeg developers
  built on Mar 31 2010 14:23:11 with gcc 4.4.3
  configuration: --cc=/usr/local/gcc-4.4.3/bin/gcc --enable-gpl
  libavutil     50.14. 0 / 50.14. 0
  libavcodec    52.64. 0 / 52.64. 0
  libavformat   52.59. 0 / 52.59. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0.10. 0 /  0.10. 0
[matroska @ 0x1193420]max_analyze_duration reached
[matroska @ 0x1193420]Estimating duration from bitrate, this may be inaccurate

Seems stream 0 codec frame rate differs from container frame rate: 47.95
(48000/1001) -> 23.98 (24000/1001)
Input #0, matroska, from
'[Frostii]_Summer_Wars_[720p][9B12BBFA]-ffplay-desync-clip.mkv':
  Metadata:
    title           : [Frostii] Summer Wars
  Duration: 00:00:32.17, start: 0.000000, bitrate: N/A
    Chapter #0.0: start 0.000000, end 32.171000
    Metadata:
      title           : 00:00:00.000
    Stream #0.0(jpn): Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 47.62
fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Metadata:
      title           : Video (h264)
    Stream #0.1(jpn): Audio: aac, 48000 Hz, 5.1, s16
    Metadata:
      title           : Audio (AAC ch5.1)
    Stream #0.2(eng): Subtitle: 0x0000
    Metadata:
      title           : English Subs (ASS)
    Stream #0.3: Attachment: 0x0000
    Metadata:
      filename        : PreciousSansDemiBoldItalic.ttf
    Stream #0.4: Attachment: 0x0000
    Metadata:
      filename        : PreciousSansDemiBold.ttf
Output #0, adts, to 'test.aac':
  Metadata:
    encoder         : Lavf52.59.0
    Chapter #0.0: start 0.000000, end 32.171000
    Metadata:
      title           : 00:00:00.000
    Stream #0.0(jpn): Audio: aac, 48000 Hz, 5.1
    Metadata:
      title           : Audio (AAC ch5.1)
Stream mapping:
  Stream #0.1 -> #0.0
Press [q] to stop encoding
[adts @ 0x11fdc90]st:0 error, non monotone timestamps 1080 >= 1080
av_interleaved_write_frame(): Operation not permitted

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<https://roundup.ffmpeg.org/issue807>
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