[FFmpeg-trac] #6971(undetermined:new): ffmpeg drops frames after deinterlacing

FFmpeg trac at avcodec.org
Tue Nov 13 17:42:19 EET 2018

#6971: ffmpeg drops frames after deinterlacing
             Reporter:  CaryKnoop    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  cuvid        |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by malakudi):

 After further testing, -r 50 on input works fine if input is a correct
 encoded file, starting from keyframe etc etc. If input is a live stream
 (http or udp multicast), even if it starts at keyframe, with -r 50 as
 input any input error will immediately result in audio/video sync error.
 -r 50 on input completely breaks the audio/video sync mechanism on input
 (I guess because it kind of breaks timestamps). So it is not a good
 solution, it works for some workloads (file transcoding) but not for live
 transcoding. -r 50 on output works fine on 3.3.8. How can I help to make
 -r 50 on output work again? Any hint to look at the code?

Ticket URL: <https://trac.ffmpeg.org/ticket/6971#comment:14>
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