[FFmpeg-trac] #10295(avformat:new): movenc: copyts with use_tfdt does not copy base media decode time

[FFmpeg]

#10295: movenc: copyts with use_tfdt does not copy base media decode time
----------------------------------+--------------------------------------
             Reporter:  thinkski  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:  mov fmp4  |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+--------------------------------------
 When transcoding an MP4 segment to another MP4 segment, it is useful to be
 able to use the same base media decode time within the tfdt tag, so that
 segments can be transcoded in parallel.

 Specifying copyts and use_tfdt should achieve this, but does not, instead
 producing an output MP4 where the base media decode time begins with 0.

 How to reproduce:
 {{{
 % ffmpeg -copyts -i in.mp4 -movflags use_tfdt -f mp4 -movflags
 cmaf+delay_moov+skip_trailer out.mp4

 % mp4dump in.mp4
 ...
     [tfdt] size=12+8, version=1
       base media decode time = 151213553719664
 ...

 % mp4dump out.mp4
 ...
     [tfdt] size=12+8, version=1
       base media decode time = 0
 ...
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10295>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker