[XviD-devel] Early SKIP and early DC-only

Marco Al marco at simplex.nl
Mon Apr 21 17:35:45 CEST 2003


From: "Christoph Lampert" <chl at math.uni-bonn.de>

> which finally gives some background about when early SKIP of a block might
> be a good choice.

It only lets you guess when cbp will be 0, it does not adress the effects of
the resultant discontinuous motion fields on perceptual quality and MV bits
(of the subsequent MB). The way MPEG4 assigns MVs to skipped MBs causes a
lot of problems which need more to solve them than simply knowing when cbp
will be 0, it is not like a DCT+quant step takes meaningfull time on a PC
anyway.

Glad to hear H264 used a sane way of dealing with MVs of skipped blocks ...
hard to comprehend how MPEG4 ended up with its braindead scheme.

Marco



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