On Wednesday 27 April 2005 21:02, Alfonso wrote:
> >After fixing these jpeg-mmx compiles ok and runs the included tests.
>
> I managed to compile mencoder without the assembly part, after
> determining that it was not possible to compile the assembly bits
> without substantial rewrite, but now I see that perhaps I was wrong. I
> asked for help in this list but found that almost nobody was willing to
> devote any time to this.
>
Well, most developers here don't know much about Windows, so they lack the
expertise needed.
> The performance of mencoder was so bad compared to the mmx-enabled linux
> version that I abandoned the idea.
This is really comparing apples and oranges. As someone else commented,
mmx-enabled mencoder should only about double your performance on a given
platform. You know how fast mmx-enabled mencoder is on Linux, so compile a
non-mmx enabled version on the same linux box and compare. This will give you
a more accurate idea of what mmx-enable gains.
If the performance on Windows is much worse than half as slow, then I would
think that's Windows getting in the way, not just the lack of mmx. There are
many other programs that run on both Linux and Windows, and most of them
suffer in performance in Windows boxes.
> If you manage to get this working
> please keep us updated. I would find very useful from time to time to be
> able to do encodings under windows with the same powerful tools as Linux.
>
And if you can find any other Windows developers who are interested in working
on this, invite them to join in and help. I'm sure the developers here would
appreciate the extra eyes and help explain the mjpeg tools. They just don't
know much about Windows-specific coding.
At the end of the day, the final goal is true cross-platform capability.
These are just my thoughts, though. Hope I haven't upset anyone.
Cheers,
John Gay
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