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24p DV-AVI to MPEG-4 encoded Quicktime

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Fongaboo
24p DV-AVI to MPEG-4 encoded Quicktime
on Jul 14, 2005 at 5:23:40 am

I have some material pulled from a DVD that was native 23.976fps on the disc. I converted this to 720x480 23.976fps DV-encoded AVI files. These look fine. I am trying to then convert it to MPEG-4 encoded Quicktimes, also at 720x480. I do the conversion right in Quicktime Pro Player's export function. I set the output file to 720x480 and also 23.976 framerate. Yet the resulting files seem to have interlacing artifacts (comb effect) during high-motion portions. Why would this be if we stayed 23.976 from start to finish??


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Ben Waggoner
Re: 24p DV-AVI to MPEG-4 encoded Quicktime
on Jul 14, 2005 at 2:36:47 pm

Well, DV doesn't really have a fully native 24p mode. Maybe you were making a 24p Advanced DV, or with 3:2 pulldown.

You're better off using a different codec for the intermediate that supports arbitrary frame rates, like Huffyuv.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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Fongaboo
Re: 24p DV-AVI to MPEG-4 encoded Quicktime
on Jul 15, 2005 at 6:17:48 am

Well the only reason I was exporting to DV-AVI's as a midpoint and then to Quicktime through the Quicktime Player's export function, was because Sony Vegas seems to exclude MPEG-4 audio as an available audio codec in its Quicktime export.

Can I make uncompressed 23.976 AVIs as a midpoint and likely avoid the comb-effect issue I was experiencing when I finally went to Quicktime?


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