[FFmpeg-trac] #7895(avformat:new): Incorrect video framerate due to no timestamp interpolation for H.264/HEVC

[FFmpeg]

#7895: Incorrect video framerate due to no timestamp interpolation for H.264/HEVC
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             Reporter:  taliho       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mpegts hevc  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by taliho):

 Replying to [comment:4 cehoyos]:
 > Is this ticket related to #4813? Is it really the demuxers job to fill
 in the missing information?

 I looked at #4813

 The problem is that the raw demuxer for hevc and h264 streams does not
 provide any timestamps which mpegts needs.
 This means that we cannot remux any h264 and hevc streams with the copy
 option... actually not just for mpegts but matrsoka, too.
 Of course, we do not have the same problem during transcoding because the
 encoder outputs pts/dts timestamps.
 My initial patch was targeting only the mpegts demuxer
 (http://ffmpeg.org/pipermail/ffmpeg-devel/2019-May/243877.html), but this
 seems a bigger issue to me.

 I feel the only way to properly get pts/dts timestamps without transcoding
 is to read the POC from each NAL. Otherwise, I do not see how to deal with
 b-frames.

 What are your thoughts?

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Ticket URL: <https://trac.ffmpeg.org/ticket/7895#comment:6>
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