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double codec render?

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Bin Yong Choo
double codec render?
on Jul 8, 2015 at 12:52:52 am


I have rendered parts of a animation in after effects with quicktime - h264 codec.

If i put all those parts together and rendered out in quicktime - h264, am i doing a double codec rendering which may affect the quality in some ways?


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Walter Soyka
Re: double codec render?
on Jul 8, 2015 at 2:35:24 am

Yes. When you compress the first time with H.264, it throws away visual information and introduces artifacts. When you use and compress that again, it throws away more visual information and introduces additional artifacts (while also attempting to preserve the original flaws!).

This is call "generational loss" and it's similar to making a copy of a copy of a VHS tape.

It's better to work with an "intermediate codec" or "mezzanine codec" during post-production to eliminate or greatly reduce generational loss. Some options include the Lossless output module preset, or other codecs like CineForm, DNxHD or ProRes.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]

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