[MEncoder-users] Inverse telecine? framerate from 120000/1001 to 24000/1001

Loren Merritt lorenm at u.washington.edu
Mon Aug 28 18:14:40 CEST 2006

On Mon, 28 Aug 2006, Munzuk wrote:

>>> IMO the situation is nowhere near this bad. Reencoding should give
>>> (almost?) the identical pattern if you just omit -ofps and leave it at
>>> 120000/1001, as long as you _don't_ use -vf harddup. No ivtc is
>>> needed of course.
>> You're right, that does work fine. I was just thinking in terms of
>> whether it is possible to reduce the framerate in anywhere near a clean
>> fashion, in case that was necessary for some reason. Leaving the
>> original framerate alone doesn't mess anything up.
> The problem with that is that I can't get a good image quality, even without
> scaling and giving more vbitrate than it can get the quality is very, very,
> very bad.
> Also I'm getting lots of duplicated frames and it seems unable to use more
> than 550 bps. why? Any solution?

mencoder tells lavc, "this file is 120fps". lavc converts that, along with 
the requested bitrate, to a desired average bits per frame. Then mencoder 
only gives lavc 24-30 fps. lavc counts frames, not timestamps, so it 
thinks it's giving you the requested bitrate when it's actually only 
20-25% of the requested rate.

--Loren Merritt

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