[theora-dev] VP3 IDCT

Dan Miller dan at on2.com
Thu Mar 6 11:01:41 PST 2003

> From: Michael Niedermayer [mailto:michaelni at gmx.at]

> btw, does theora/vp3 have a maximum allowed keyframe (or 
> co-located non-skiped 
> non-intra macroblock) limit like mpeg* ? IMHO it should have 
> one, otherwise 
> different decoders with different IDCTs will drift too much 
> like u mentioned
The DCT/IDCT in VP3 is 100% integer-based, so our philosophy is: you must duplicate it exactly.  Drift is not allowed.  Therefore maximum frames to a keyframe is unnecessary.  There are reasons one might not want keyframes at all (except at the beginning of course).
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