[FFmpeg-trac] #6971(undetermined:new): ffmpeg drops frames after deinterlacing
FFmpeg
trac at avcodec.org
Sat Nov 24 00:11:52 EET 2018
#6971: ffmpeg drops frames after deinterlacing
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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
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Comment (by oromit):
The issue is that the timebase will be 1/25 for 25i content. So it's
impossible to represent 50 fps in that timebase, but a decoder can't
change the timebase.
Hence the -r 50 on input, to trick ffmpeg.c into using a 1/50 timebase.
Results of trying to double the framerate on a timebase where +1 is
already too much are pretty much random.
This jumping is weird though, and I can't reproduce it here. I suspect the
source material is already broken like that and it just carries through.
Keep in mind that mpeg2 is most likely not a well tested format, and
nvidias parser also is far from perfect for common formats. So it messing
up the re-ordering is not out of the question.
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Ticket URL: <https://trac.ffmpeg.org/ticket/6971#comment:28>
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