[FFmpeg-user] Reversing PAL->NTSC telecining.
Carl Eugen Hoyos
cehoyos at ag.or.at
Tue Jan 7 16:16:25 CET 2014
Nicholas Robbins <nickrobbins <at> yahoo.com> writes:
> ffmpeg -probesize 2G -analyzeduration 2G -i test.vob
> -sn -an -c:v copy /tmp/testing/out.mkv
> ffmpeg version 2.0.2
This looks old (and iirc and you reported a problem
with fieldmatch and decimate on mplayer-users, then
this is the reason). Please always test current git
head before reporting a problem on this mailing list.
> Can't write packet with unknown timestamp
> av_interleaved_write_frame(): Invalid argument
This needs -fflags2 +genpts (an input option).
> So you are saying that fieldmatch doesn't label the
> frames as interlaced if it can't fix them, so yadif
> won't don anything in this command.
No, on the contrary, but I think you should only use
this additional feature of fieldmatch if needed.
(And for the only source I know where it may be useful,
it indeed does not work correctly. But it probably
works if a necessary frame was simply removed from the
stream before transmission, this is called "bad edit".)
> So my choices are, leave all the interlaced frames or
> yadif the whole video. Is that correct?
Do you see any interlaced frames after using fieldmatch?
If not, please don't use yadif, if yes, consider
providing a sample.
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