David G.,
To answer your queries, Pixlet is in the standard 10.3 release as a
QuickTime codec that works with any Mac.
One expects performance as follows:
On 2 GHz. G5: Full-HD (1920x1080 frames), @24fps, full-screen, 1
bit/pel,
On 1 GHz. G4: "HD/2" (960x540 frames), @ 24fps, full-screen, 2 bit/pel.
As far as I know there is no other "port" of Pixlet. For one thing, we
do not see a way that a non-Altivec machine can possibly rise to the
Full-HD
decode & display performance. In particualr, Pixlet has heavy
vectorization
of quantization and wavelet stages.
So for example, on an (ancient) G3 Mac, Pixlet should
run but sluggishly so. In other words, Pixlet is a true,
Apple-technology-dependent codec.
By the way, Pixlet compression (forward-encode) is likewise
vectorized, and runs within an order-of-magnitude of the decode speed,
so, say, several Full-HD frames/sec. on G5, assuming original 24-bit or
48-bit RGB format.
There is one other feature that is of interest for extreme-quality
seekers; namely, Pixlet has a final stage output dither, to effect a
virtual
48-bit color-CRT display, that is, animation essentially devoid of Mach
banding due to the finitude of monitor colors.
Respectfully,
Richard Crandall
Advanced Computation Group
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