Re: [Mjpeg-developer] Altivec encodings ~20% higher than Intel

[Steven M. S. <sms@2BSD.COM>]

On Thu, 9 Oct 2003, James Klicman wrote:

> The new DCT function is ready and has been imported into CVS. This DCT
> is very accurate, though slightly slower. Overall it seems that a
> 1 hour encoding might take an extra 12 seconds. That extra 12 seconds in

	12 sec out of 3600 or so probably isn't statistically significant
	(it wouldn't be noticed either in most cases ;)).

> I've encoded with the old 16bit DCT/IDCT and the new floating point
> DCT/IDCT and the improvement is visible with non-bitrate constrained

> So the status of the AltiVec port is all AltiVec functions produce
> identical results as the C code except for the DCT/IDCT which produces
> more accurate results than the C code...

	Super!  Thank you very much - I'll check it out tonight (via
	the developer's cvs server since anon cvs is once again
	deaf/dumb and several days out of step).

	Cheers,
	Steven Schultz