[FFmpeg-trac] #10181(undetermined:new): Imprecise seeking in mp4 generated by ffmpeg.

[FFmpeg]

#10181: Imprecise seeking in mp4 generated by ffmpeg.
-------------------------------------+-------------------------------------
             Reporter:  Dale Curtis  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Seeking to 10s yields frame for 10.10s.

 Originally reported at:
 https://bugs.chromium.org/p/chromium/issues/detail?id=1410446

 While the issue reproduces on tip of tree, reporter notes it doesn't
 happen with 4.4.2-0ubuntu0.22.04.1. However, when I checkout
 origin/release/4.4 I'm still able to reproduce, so I'm not sure what the
 Ubuntu version maps too.

 How to reproduce:
 {{{
 % ffmpeg -t 60 -f lavfi -i color=c=black:s=1280x720 -c:v libx264 -tune
 stillimage -pix_fmt yuv420p -vf "drawtext=fontfile=DroidSansMono.ttf:
 timecode='00\:00\:00\:00': r=23.976: x=(w-tw)/2: y=20: fontcolor=white:
 box=1: boxcolor=0x00000099" -y output.mp4

 % ffmpeg -ss 00:00:10 -i output.mp4 -frames:v 1 out-bad.png
 Observe that out.png says "10:10" at the top instead of "10:00"

 % ffmpeg -ss 00:00:09.6 -i output.mp4 -frames:v 1 out-correct.png

 ffmpeg built today:
 ffmpeg version N-109818-g8ed1d6b5e4 Copyright (c) 2000-2023 the FFmpeg
 developers
   built with gcc 12 (Debian 12.2.0-10)
   configuration: --enable-static --enable-libx264 --enable-gpl
   libavutil      58.  0.100 / 58.  0.100
   libavcodec     60.  0.100 / 60.  0.100
   libavformat    60.  0.100 / 60.  0.100
   libavdevice    60.  0.100 / 60.  0.100
   libavfilter     9.  0.100 /  9.  0.100
   libswscale      7.  0.100 /  7.  0.100
   libswresample   4.  9.100 /  4.  9.100
   libpostproc    57.  0.100 / 57.  0.100

 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10181>
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