23.976 to 29.97

Yogurtron · Post by **Yogurtron** » Fri Sep 03, 2004 8:35 am

Greetings,

I'm curious about some framerate stuff. Now, If I have a 23.976 FPS video like the guides instruct, and I wanted to it into a 29.97 FPS file for use in a con, what would I do about the audio?
I know that this script should do the 3:2 pulldown:

AssumeFrameBased
SeparateFields
SelectEvery(8, 0,1, 2,3,2, 5,4, 7,6,7)
Weave

(As explained by AD a while back), but I was curious how the audio works out. Obviously changing the from 23.976 fps to 29.97 is a bad idea (I did it just to see how much it'd screw with the pitch, heh), but what do I do with it so that it will sync up with the video correctly at the new interlaced 29.97 video?

Thanks

Scintilla · Post by **Scintilla** » Fri Sep 03, 2004 11:13 am

You shouldn't need to touch the audio to get it to match.

Of course, with the majority of conventions, you don't even need to do the conversion to 29.97 yourself -- you can just encode an MPEG-2 at 23.976 with the 3:2 pulldown flag set, so that the hardware will do the pulldown automatically.