[x264-devel] Re: x264 improvement

[Firas Al-Tahan]

Eric,

First off - thanks a great deal for your efforts - Handbrake and the
PPC x264 work great and I haven't had a bad encode in over a year
using the software you provide/help to provide.

As I said, I'm no guru or Altivec programmer - but I really want to
get my hands dirty this summer in Altivec and x264. I'd like to make a
G5 multi-processor/multi-core only version that really makes the G5
shine.

I'm going to be busy till after May - just quickly, are there any good
PPC and Altivec books out there that you'd recommend? Some of the
resources Google is bringing up are dated and aren't available - a
worying sign!

Thanks,

Firas

On 3/11/06, Eric Petit <titer at m0k.org> wrote:
> Firas Al-Tahan wrote:
> > 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?
>
>   I just didn't have much time to keep working on it. x264 is clearly
> not as optimized for PPC as it is for x86 (Altivec provides a ~100%
> speed bump from the C version, whereas MMX/SSE provide a 300+% speed
> bump). Some parts aren't optimized at all, and others could certainly be
> optimized better (I'm no AltiVec guru, and especially, dealing with
> AltiVec and unaligned data everywhere gave me a hard time).
>
>   If you or someone else can spend some time to it, I'll sure try to
> answer any question you might have.
>
> --
> Eric Petit
>
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