[mythtv-users] Mac OS X video profile settings in 0.21?
Todd Ignasiak
todd.ignasiak at gmail.com
Thu Mar 13 16:41:28 UTC 2008
On Thu, Mar 13, 2008 at 8:36 AM, scram69 <scram69 at gmail.com> wrote:
> On Thu, Mar 13, 2008 at 12:02 AM, Todd Ignasiak <todd.ignasiak at gmail.com> wrote:
> > On Sun, Mar 9, 2008 at 1:37 PM, Todd Ignasiak <todd.ignasiak at gmail.com> wrote:
> > > I just upgraded my Mac OS X MythTV setup to 0.21, and ran into
> > > problems with video playback performance.
> > >
> > > 1080i playback went from using 80-90% of one CPU (Mac Mini 1.66GHz
> > > Core Duo) in 0.20.2 to 135-155% CPU with 0.21 and choppy playback.
> > > I have tried a bunch of settings for the video profile, but nothing
> > > has brought the CPU down from the 150% range. Even 720p playback,
> > > which used to be around 65-70% cpu load, is at 130%+.
> >
> > After a bunch of experimentation, I finally located a Trac ticket
> > which had a patch to enable MMX in Leopard. After applying that
> > patch, video decoding CPU usage is back down in the ballpark that 0.20
> > was in. Are these 'known issues' posted anywhere? It is not
> > mentioned in the release notes, or any mailing list, wiki, etc. that I
> > could find.
> >
>
> Does this mean that the high CPU usage is a Leopard-only issue? Is
> MMX enabled by default for Tiger in 0.21? I'm holding off on
> upgrading the backend to 0.21 until I can be sure my OSX 10.4 frontend
> won't be crippled...
I don't have any non-Leopard x86 machines to test on. But, the logic
in the configure script is:
osxver=$(uname -r | cut -c 1)
if [ ${osxver} = "9" ]; then
disable mmx
So, this should only apply to Leopard.
More information about the mythtv-users
mailing list