[mythtv-users] Re: Playback of Transcoded (MPEG4) file on Epia ME6000

[MagicITX]

On 4/23/05, Ivor Hewitt <ivor.hewitt at gmail.com> wrote:
> The gcc compiler hasn't got any scheduling logic for the c3 since via
> hasn't released that information or contributed to the gcc
> development..... and since the c3 design is based off the old cyrix
> dies I suspect that the 586 optimisations might be a reasonable match.
> 
> -Os is all very well but that just tries to pack everything into the
> smallest space and so disables all word alignment and doesn't try to
> optimise the code for speed. -O2 seems like a reasonable compromise
> for the c3. It doesn't unroll loops but does do some optimisations.
> 
> Personally I always found "586 and -O2" gave decent performance...
> with the added benefit I can use the same binaries on P3, C3 and C3-2
> which helps testing and debugging (for me).
> 
> If I have time I might run some benchmarks with different options.
> 
> 
> On 4/22/05, Devan Lippman <devan.lippman at gmail.com> wrote:
> > I'd have to agree with Ivor's flag settings, I've found on my TC that
> > i586 works better than C3
> >
> > On 4/22/05, Ivor Hewitt <ivor.hewitt at gmail.com> wrote:
> > > On 4/22/05, Neale Swinnerton <mythtv-users.spam at isismanor.com> wrote:
> > > > Hi,
> > > >
> > > > I've got a Epia ME6000 working well as a Myth frontend. I've got the
> > > > XvMC playback so that watching Live TV or recordings is great (I've got
> > > > a backend with 2 x Hauppauge DVB-T cards).
> > > >
> > > 1. I'd have thought an m6000 would struggle. Out of interest what cpu
> > > load are you seeing in mplayer?
> > > 2. Why are you transcoding dvb-t recordings anyway? do you really need
> > > to save disk space that badly. Wouldn't you rather watch the original
> > > quality?
> > >
> > > > -march=c3 -Os -fomit-frame-pointer
> > > >
> > > What about just -march=i586 -O2
> > > _______________________________________________
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> > >
> >
> >
> > --
> > Thanks,
> > Devan Lippman <devan at lippman.net>
> >
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> 

I did a comparison of compiler optimization settings for the ME6000
and M10000.  The results are mixed.  You can find the articles on
www.magicitx.com under the VIA Epia menu -> Optimization if you're
interested.

-- 
Tim
www.magicitx.com