Re: Suggestions for improving ffmpeg performance?
Kevin Monceaux wrote:
Debian Enthusiasts,
Does anyone have any suggestions for improving ffmpeg performance. To
make a long story, well, not quite so long, I recently converted my
home desktop box from ArchLinux to Debian. Back when I was running
ArchLinux, and maybe one or two distros before, I started using
pyTivo, a python script that can convert almost any video format into
something a TiVo box can play and stream it to said TiVo box. It uses
ffmpeg for the conversion. Under ArchLinux I could start a transfer
and watch the video on my TiVo as it was being streamed. In most
cases it would stream the video faster than normal playback speed, and
would finish transferring it before one could finish watching it.
Judging from the indicator lights on my network switch while a video
was being transferred there was constant communication between my
desktop PC and my TiVo. But, since I've switched to Debian that
performance has gone down the drain. I have ffmpeg installed from
Debian-Multimedia.org. Now, running Debian(Lenny), if I start a video
transfer from my PC to my TiVo I have to wait for quite a while before
I try to start watching it. Sometimes the transfer dies in
mid-transfer. Watching my network switch I see intermittent activity
between my desktop PC and my TiVo with two to three second pauses in
between. ldd shows ffmpeg is using the i686 libc6 libraries. I tried
rebuilding the ffmpeg package from source optimizing it for i686, but
that didn't help. Does anyone have any suggestions I might try to
improve performance?
The ffmpeg version in the debian-multimedia repository is build without
MMX, I don't know exactly why. And this makes the program quite slow
(something like 3 times slower).
I've just rebuilt the package reenabling MMX, and apparently it works
OK, and much faster. I've read that you've rebuilt the package, but are
you sure MMX is enabled?
--
BOFH excuse #75:
There isn't any problem
Eduardo M KALINOWSKI
ekalin@gmail.com
http://move.to/hpkb
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