[x264-devel] Re: Slices

[Loren Merritt]

On Tue, 24 May 2005, Tuukka Toivonen wrote:
> On Mon, 23 May 2005, Tom Jacobs wrote:
>
>> having said this what do people think? is it aceptable (assuming im 
>> getting good benifits from using my multi-prossor system)?
>
> Yes. I think it is acceptable. I'm quite sure that this works relatively 
> better than the ffmpeg MPEG-4 SMP encoding; I'm quite surprised that it's 
> this way. The quality loss is less than 1% at high bit rates; with just two 
> slices it's practically the same as no-slices version.

Agreed. Send a patch, and I'll see about applying it between working on 
UMHex and 8x8 transform.

> With ffmpeg, there was a significant quality loss with just two threads, and 
> worse, the speed improvement wasn't that much (far from 2x).

I don't know either. The only difference in strategy I see is that ffmpeg 
first runs fullpel ME on the whole frame, waits for all threads to finish, 
then runs subpel + encode.

--Loren Merritt

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