[FFmpeg-devel] dealing with tables in DV codec

Måns Rullgård mans
Wed Sep 10 09:22:41 CEST 2008

Diego Biurrun <diego at biurrun.de> writes:

> 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.

Who gets to decide which machines are important?  Is K6-3 more
important than SPARC?

M?ns Rullg?rd
mans at mansr.com

More information about the ffmpeg-devel mailing list