[MEncoder-users] Change framerates with mencoder, part two

[Rich Felker]

On Thu, Feb 23, 2006 at 03:03:57PM +0100, Sergio wrote:
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> Hi again, all!
> 
> First, thanks for all the replies. Unfortunately none of them helped. I
> can't use the first answer (use the new film2pal filter) because I want
> to use it in a program that I wrote
> (http://www.rastersoft.com/programas/devede.html), designed to easily
> create video DVDs. I can't force people to use CVS version of Mencoder :(
> 
> About the second answer (put -ofps with the desired frames per second,
> and harddup), it doesn't work. It seems that -ofps only sets the
> reproduction speed, but doesn't duplicate or remove any frame, so the
> result is that the video is played faster (or slower), but not the
> audio, so it gets quickly desincronized.

No, you're just omitting -vf harddup. -ofps definitely does what you
want here. However, for minor speed changes, using -speed might be
better than duplicating frames (duplication makes for choppy video).
Try something like -speed 25025/24000 to go from NTSC FILM (24000/1001
fps) to PAL, and of course you can make similar conversions for
others. Be aware tho that changing framerate more than slightly with
-speed will make things look and sound very weird. :)

Rich