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Posted by Jukka Aho on 11/13/06 19:55
Veggie Dave wrote:
>> [PAL => NTSC conversion]
> Try this...
>
> Render your [25 fps PAL] project to 23.976fps rather than 29.97fps.
> This will dramatically cut down the amount of juddering, especially if
> there's a lot of fast moving action.
That assumes non-interlaced 25 fps material (are we sure the OP's PAL
original is like that?), or some sort of (automatic) deinterlacing
process taking place.
By deinterlacing 50 fields-per-second material to 25 frames-per-second,
then slowing down to ~24 (23.976) fps, you will lose half of the
original temporal resolution. (I.e., motion will be twice as juddery as
in the original - watch out for those fast pans and zooms! - and it will
also get the 3:2 judder from the 3:2 pulldown in the NTSC DVD player.)
It's not a bad method _if_ the material originated as 25
frames-per-second _non-interlaced_ ("progressive") video, but we don't
know if the OP's material is like that or not. Also, if you muck with
the frame rate, you will have to do something about the audio as well.
(Time-stretch it, most likely.)
I'd do these kind of conversions in Avisynth. Avisynth is one of the few
video processing programs that gives easy field-level access to video
streams, and doesn't do anything "automatic" (such as automatic
deinterlace) behind your back. You can keep track of what you're doing
to your video all the time. And you can't beat the price - it's free.
--
znark
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