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

[Evgeniy Stepanov]

On Thursday 31 August 2006 05:07, Rich Felker wrote:
> Yes, what you said is nonsense. The reason the file uses 120 tick/sec
> timebase is that it's not all 24 fps but some 30 fps, and the smallest
> common timebase that can represent timestamps correctly for both is
> 1/120 sec. If you try to make it 1/24 sec timebase, you will have to
> discard one in every five frames from the 30 fps parts. If you want to
> make it 1/30 sec timebase, you will have to show every 4th frame in
> the 24 fps parts for double duration. Both choices will look very
> ugly and choppy.

It might be a good idea to somehow locate the parts of original video that are 
24 fps and the parts that are 30 fps, and encode them separately. Then, 
either leave the resulting videos as they are, or mux them into some vfr 
container.

AFAIK, there is no good way of converting 30 <-> 24 fps.