Re: [libdv-dev] Re: libdv for AMD64

[Dan D. <da...@de...>]

On Wed, 2004-10-27 at 00:13 -0700, Roman Shaposhnick wrote:
> On Wed, Oct 13, 2004 at 07:03:35AM -0400, Dan Dennedy wrote:
> > Thank you. I downloaded it, and will work on making sure it merges
> > nicely into my CVS working copy and test. Then, hopefully we get some
> > others to test.
> 
>   Well CVS obviously works on Opteron/SuSE 8. So that's covered. Now 
>   for the bad news. For some reason it takes almost twice the time to
>   decode pond.dv (8.7 user) compared to the ffmpeg with x86_64
>   enabled DV decoder (4.7 user).

Dean did say it was not optimised for 64bit, just a minimal port. I
expect ffmpeg to be better - both 32 and 64bit. The real comparison to
be made is against --disable-asm. A user sent an e-mail after my
announcement on kino forum, and said his system worked fine with the
current libdv release. I told him that asm/mmx was disabled due to arch
detection at configure. I asked him to try CVS, he did, and reported a
huge performance gain, of course.

Also, Kino's bugtracker http://jira.schirmacher.de/ contains a segfault
with backtrace bug report of an amd64 user using kino compiled against
libavcodec. It should be easy to spot in the list. However, it contains
no libavcodec version indication. As a matter of fact, that sort of
thing is rather hard for users to track and report as many ffmpeg users
are not using an official ffmpeg release.