[FFmpeg-devel] dealing with tables in DV codec

Diego Biurrun diego
Wed Sep 10 07:41:51 CEST 2008

On Tue, Sep 09, 2008 at 01:51:06PM -0700, Roman Shaposhnik wrote:
> as I promised, I tried to come with alternative ways of dealing
> with macroblock placement in DV codec, and it seems that no
> matter what I use on Xeon and Opteron it is basically a toss up.
> There's no speed gain, there's no speed loss. The tables can
> go so it is a net gain. Now, on SPARC I see a stable speed 
> loss of about ~3% or so. And I suspect that the same will
> be true on any chip with a low clock speed.
> Now, I'm publishing a temporary diff to solicit public comments
> on how the calculations can be optimized even further. If nobody
> comes up with any kind of good ideas -- I don't know what to do.
> Michale has always told us that even ~3% is significant enough. 
> So it needs to be dealt with before any change can occur.

I don't think SPARC is important.  Let me know what I will have to do
and I will benchmark on my trusty old K6-III 500.  Then you will have
numbers for a low clock speed x86 system.


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