[FFmpeg-trac] #9775(undetermined:new): incorrect duration when start not zero

[FFmpeg]

#9775: incorrect duration when start not zero
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             Reporter:  delpeck      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 I am having a problem with the duration field when I am encoding segments
 of a HLS - ffmpeg versions greater than 4.3.3 seem to be writing an
 erroneous duration (the start + real duration).  Try the following:

 //ffprobe attached segment-5.ts results:
 Input #0, mpegts, from 'segment-5.ts':
   Duration: 00:00:04.03, start: 37.136000, bitrate: 5334 kb/s

 //encode segment-5.ts
 ffmpeg -i segment-5.ts -copyts -map 0:v -c:v libx264 bbb-seg-enc.mp4

 /ffprobe the results:
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb-seg-enc.mp4':
   Duration: 00:00:41.17, start: 37.200000, bitrate: 491 kb/s

 //encode segment-5.ts without the -copyts
 ffmpeg -threads 3 -i segment-5.ts -sws_flags lanczos -map 0:v -c:v libx264
 -pix_fmt yuv420p -profile:v main  -level:v 3.1 -preset:v slow -crf 19
 -threads 2 -an -strict experimental AVC_576_2pass_nocopyts.mp4 -map 0:a:1?
 -vn -codec:a copy -bsf:a aac_adtstoasc -strict experimental aac-
 audio-64.mp4

 //ffprobe results (notice the duration is correct, but start is zero'd
 out)
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'AVC_576_2pass.mp4':
   Duration: 00:00:04.03, start: 0.000000, bitrate: 8535 kb/s


 ffmpeg version 4.3.3 and lower write the correct duration and preserve the
 start time, is there anyway to write the correct duration and preserve the
 start time with ffmpeg 5.0.1?
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Ticket URL: <https://trac.ffmpeg.org/ticket/9775>
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