[FFmpeg-trac] #7461(ffmpeg:new): Application provided invalid, non monotonically increasing dts to muxer

[FFmpeg]

#7461: Application provided invalid, non monotonically increasing dts to muxer
-------------------------------------+-------------------------------------
             Reporter:  Anuskuss     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
             Keywords:  non,         |               Blocked By:
  monotonically, increasing, dts,    |  Reproduced by developer:  0
  to, muxer                          |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I'm trying to stretch an AC3 audio file to match the frame rate of a video
 file but it gives me the error mentioned in the title:

 {{{
 $ ffmpeg -i input.ac3 -af "atempo=0.95904" output.ac3
 [ac3 @ 0000020faaca1b40] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 58808576 >= 744704
 }}}

 I tried to find the broken part...
 {{{
 ffmpeg -t 1175.072 -i input.ac3 -af "atempo=0.95904" part1.ac3
 ffmpeg -ss 1175.264 -i input.ac3 -af "atempo=0.95904" part2.ac3
 }}}

 ...and work around it (since it's silence anyway)
 {{{
 ffmpeg -i input.ac3 -f lavfi -i "anullsrc=r=48000:cl=5.1" -filter_complex
 "[0:a]atrim=end=1175.072[P1];
  [0:a]atrim=start=1175.264,asetpts=PTS-STARTPTS[P2];
  [1:a]atrim=duration=0.192[S];
  [P1][S][P2]concat=n=3:v=0:a=1[C];
  [C]atempo=0.95904[F]"
 -map "[F]" output.ac3
 }}}

 Still errors. I tried a number of things like `-fflags +igndts` or
 encoding it twice (first without arguments and then with `-af atempo`) but
 I'm trying to accomplish that with only one encoding if possible.

 {{{
 $ ffmpeg -version
 ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
 built with gcc 7.3.1 (GCC) 20180722
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7461>
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