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Author: feedmeNOWhuman Big funky green star, 20000 posts Top Recommended Fools Old School Fool CAPS All Star Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 886  
Subject: Re: Frame rates Date: 7/13/2012 6:26 PM
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I'm concerned with how to best render a DVD consisting of files with multiple frame rates. Is that topic within anyone's area of expertise?
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Way outside my expertise, but I'm thinking the source frame rates will be irrelevant, and the rendering engine will combine them all from the time line with the frame rate you choose.



That much is true, but depending on the frame rates of the source files, there are better and worse ways to do it, especially if you throw 24 f/s into the mix.

I've done a bit of reading, and my limited understanding is that if you have video file 'A' with 60f/s and file 'B' with 30 f/s, you can render at 60 and maintain the 60 f/s resolution on A and the rendering process will simply double-up the frames for file B, and so you might see a difference when the 'B' clips come up, especially if you're using slow motion.

Or if you render at 30 f/s, then it will down-res file 'A' by skipping every other frame and everything will match.

The complicated part seems to be when you're messing around with 24 f/s and you have to use a "2-3 pulldown", which is explained in the links below:

http://www.zerocut.com/tech/pulldown.html

and

http://blog.abelcine.com/2011/08/19/simple-workflow-for-remo...

and

http://www.pcmag.com/article2/0,2817,2403746,00.asp


It looks like I'm going to be able to obtain source files from 4 of the 5 people I've contacted. I think everything I'm going to be dealing with was shot at 60 f/s, and so if I render at 30 for NTSC, it shouldn't be a problem.

Whether they were all shot at 60p or 60i is another matter. But enough headaches for one day.
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