[mythtv] Enabling MMX on MacOS X Intel builds

[usleepless at gmail.com]

thank you for your reply.

what kind of threading model is used for the myth build on Mac?

which videotiming method is used?



On 3/23/06, Todd Ignasiak <ignasiak at gmail.com> wrote:
> On 3/23/06, usleepless at gmail.com <usleepless at gmail.com> wrote:
> > Hi,
> >
> > pardon my curiousity.
> >
> > On 3/22/06, Todd Ignasiak <ignasiak at gmail.com> wrote:
> > > I patched the MMX stuff in the 0.20 SVN tree, and was able to build a
> > > frontend binary.  The MMX made a huge difference in the MPEG2 decoding
> > > performance, taking it from ~150% CPU to 85-95% CPU on a core duo Mac
> > > Mini.
> >
> > what kind of stream are you talking about? ( Mbs, source? )
>
> That was an ATSC broadcast, captured via QAM256 from my Comcast cable
> provider.  The content was 1080i from HD video cameras (60
> fields/sec).
>
> ~ 95-98% -- 1080i from video source, college basketball program
> ~ 85-95% -- 1080i from film source, "The West Wing"
> ~ 70-76% -- 720p from film source, "Lost"
>
> I don't currently have any 720p60fps video material to test with.
> But, I guess it would be a bit higher CPU usage than the 24fps film
> sourced material.   I don't have bit rate stats on any of the streams.
>
> > is the playback flawless?
>
> I haven't been using it long enough to give a good analysis.  But, it
> has looked pretty good so far..  on par with my Linux frontend with an
> Nvidia FX5200 card.
>
> I noticed a bit of judder with "The West Wing", but that may be from
> the broadcase, as my local NBC broadcaster has been tweaking their
> encoder.   I also saw a couple instances of tearing with the 720p
> material,  but only a couple times in the one hour program.
>
> I need to view more broadcasts, and compare Linux vs. Mac output..
>
> > do you have other clients than the Mac ( ie a linux client ), to
> > compare the performance?
> >
> > is the videooutput Xv? do you have mplayer running as well? what kind
> > of load does mplayer take?
>
> No, it's using MacOS video APIs, not X11/Xv.     I have an Intel
> binary of VLC, and it uses quite a bit less CPU than myth, I think it
> was around 55-65% for 1080i.
> _______________________________________________
> mythtv-dev mailing list
> mythtv-dev at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
>