[theora] Theora encoder performance

[Gregory Maxwell]

On Mon, Dec 7, 2009 at 9:56 AM, Benjamin M. Schwartz
<bmschwar at fas.harvard.edu> wrote:
> Mircea Gliga wrote:
>>    Then I measured how long does it take for Theora to encode an image
> ...
>>    On average: *80 ms*.
>>      Using XVID I've obtained between *20-25 ms* for an image. That's
>> 60ms longer using Theora.
>
> That is surprising.  A big difference like this is definitely not
> expected.  Are you encoding at approximately the same bitrate?  Video
> encoding speed depends heavily the target bitrate or quality.  What
> version of libtheora are you linking against?  Apart from switching out
> XVID and Theora, is the code otherwise identical?

"OS Name    Microsoft® Windows Vista™ "

How is libtheora compiled? Are assembly optimizations enabled? Is this an
x64 build?