HI Richard,
> If you'd still like a piece of the capture, I'll gladly push some
> stuff your way. But, in further experimenting tonight I think I've
> found the culprit. If I drop the -Q 4.0 parameter, then rc92 stops
> producing the splotches. It looks like rc92 has a different effect
> (and a bad one at that) with the -Q parameter than what rc90 had with
> the -Q parameter.
If you could send me a snippet with along the options that trigger the
artefact in encoding that would be *very* useful. The issue you're getting
looks very much like a numeric overflow in the discrete cosine transform
routines.
There were some changes in bitrate control in rc92 and it could be that with
the new bitrate control regime -Q 4.0 is enough (for this particular
sequence) to kick off some blocks where the MMX DCT routines run out of
nuermic precision.
cheers,
Andrew
PS
-Q 4.0 is really really high!!!
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