[mythtv-users] VIA EPIA Illegal Instruction (AND performance issues)

Justin Mayfield mayfield at mc702.org
Fri Jun 13 16:09:42 EDT 2003


Thanks guys, up and running now, except the system is too slow with my
stock setup.

Oddly enough the deinterlace option was on be default, of course, and
the system didn't crash!  I've run into this before with my Celeron
systems running fronend, but the C3 didn't have this issue.  I'm
guessing the compiler flag -march=i586 took care of this, but I haven't
looked closely at the defines used for the deinterlace code.

I'd love to hear from other people using this setup, though; 
Specifically with regards to performance of mpeg2 decoding.  We're using
PVR-250's for our backend on a high perf system (2.4ghz p4 with .5GB
ram).  I've read about mythfrontend not handling different bit rates
very well (and likewise proved it by playing back lower bitrate video
just fine with mplayer on our fast systems), so perhaps some work is
needed here to really prove the C3 will eventually work at slightly
reduced bitrates;  However, I'm wondering if some of this is related to
using OSS instead of ALSA, which is better supported apparently.

JM

On Fri, 2003-06-13 at 11:10, Bill Crooke wrote:

> Justin,
> 
> Also make sure you turn off the deinterlace option in setup
> 
> Bill
> 
> Isaac Richards wrote:
> 
> >On Friday 13 June 2003 02:06 pm, Justin Mayfield wrote:
> >  
> >
> >>Hi,
> >>
> >>I'm trying to run mythfrontend and possibly all the backend code on a
> >>VIA EPIA board (based on a 800Mhz C3);  The problem is, the arch seems
> >>to be half 686 and half something less, so I'm getting Illegal
> >>Instruction errors when trying to execute mythfrontend and some of the
> >>other apps.  I even compiled the whole suite on the system, so I would
> >>assume it would correctly identify the system capabilities, but I guess
> >>not.
> >>
> >>My guess is that it is trying to do some sse or mmx2 or sse2
> >>instructiions somewhere, and I know I could put a debugger on it, and
> >>figure it out, but I'm guessing someone already knows the quick and easy
> >>flags I need to change in the build system to get around this.
> >>
> >>Any help is appreciated, and if not, I'll send out a message letting
> >>people know how I got around it.
> >>    
> >>
> >
> >Or you could just read the docs:
> >
> >http://www.mythtv.org/docs/mythtv-HOWTO-18.html#ss18.1
> >
> >Isaac
> >_______________________________________________
> >mythtv-users mailing list
> >mythtv-users at snowman.net
> >http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
> >
> >  
> >
> 
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