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Mostrar Mensajes MenúCitarSome raws recently come in 120fps versions, which are created by some japified capture apps, those you can safely "decimate by 5" in avisynth or virtualdub to achieve the usual 23fps material.
CitarHi !
A lot of resent anime is done at multiple frame rates. Parts of it are
done at 30fps progressive and most is done at 24fps telecined. Also a
lot of frames are done at lower telecined or progressive framerates to
save money.
Some people tried to solve the problem by using this tool:
http://www.kjps.net/user/r2-m2/clare/dtv/120fps.html
(Sorry, Japanese only, but you will get an idea about how it done.)
The tool converts 24fps video to 120fps by inserting 4 "dropped" frames
between each real frame and converts 30 fps video to 120 fps by
inserting 3 dropped frames. After that the video clips are joined
together using VirtualDub or something similar. That solves the problem
but there are a lot of issues associated with this "solution" (I should
have rather said ugly hack.)
a) dropping frames causes problems with quite a lot of players.
b) packed B frames afaik don't work correctly
c) creation of those hybrid files is a very complex job
I heard P and B frames with no change are around ~150 bytes using
regular xvid. Using the scheme above without support for "dropped"
frames would waste quite a lot of space and would also use a lot of CPU
power for nothing. A special support for frames without change would
solve that problem. A plugin could do add the additional frames and do
the ivtc where needed, it could also add a flag to the frames that
should be dropped.
What I'm asking is: Is there already a better solution for coding
"hybrid" 24/30 fps video in xvid ? Are there similiar flags like the
film mode flag in mpeg2 in xvid ? Is there a good way to drop frames
without changing the existing bitstream ? Where to look at the source to
do that ?
Thank you
Jan