[x264-devel] Re: x264 improvement

[Firas Al-Tahan]

Well I must admit - by the sounds of things your MMX implementations are
making big differences. I would love to make the most out of Dual Core /
Dual Processor Altivec G5's - I just think/fear that since Apple have gone
Intel - people aren't going to bother trying to keep the Altivec ball
rolling.

There are open sourced Altivec libraries being produced which are meant to
improve code because it's all hand-written - but this is assuming x264 uses
these libraries.

At this point I'm just researching into the background - I have a degree to
write up for the 31st and exams in May - but I want better performance from
x264 on my Dual Processor Mac - and I want to help make it quicker.

On my Dual G5 I'm currently seeing 10-13 FPS on 1Mbps for DVD resolution on
Eric Petit's Handbrake (http://handbrake.m0k.org/) application - so im not
exactly sure what the specifics are in terms of codec parameters - id need
to look that up one day....

Firas


On 3/10/06, Loren Merritt <lorenm at u.washington.edu> wrote:
>
> On Fri, 10 Mar 2006, Firas Al-Tahan wrote:
>
> > Loren Merrit:
> >
> > Why did this stop? Is it because Apple went with Intel? Off the top of
> your
> > head - was it optimized very well?
> >
> > From what I'm seeing, Core Duo Mac Mini's at 1.63GHz are getting double
> the
> > frame rates of my Dual Processor G5 at 2.0GHz. As you can imagine - I'm
> not
> > impressed! I can see there has been Altivec work done - but I'm not sure
> how
> > much and how up to date it is.
> >
> > Where / who would I need to get in contact with to get the ball rolling
> > again?
>
> No one explicitly discontinued support or anything. It's just that none
> of the current developers has a Mac.
> Eric Petit wrote the altivec stuff that's there now, but he hasn't been
> active in x264 lately.
>
> I can't comment on the optimization quality of the altivec, but we have
> many mmx funtions with no altivec implementations.
>
> --Loren Merritt
>
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