[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.


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