[mythtv-users] mythtv recompile because of new CPU

[Joseph A. Caputo]

What's your setup?  Unless you're using a hardware-encoding card like the
Hauppauge PVR-250/350 or the Matrox G400, even a P3-667 is a bit weak for
watching LiveTV at anything but the lowest resolution & quality capture
settings.  If you're trying to do anything more than 320x240 RTJPEG, you're
probably pegging your CPU (again, unless you've got a hardware encoder).  A
general rule of thumb for high-quality (480x480 or higher) encoding with a
standard V4L card is 1GHz per tuner + ~500MHz per playback stream.  (So, 1
tuner in a frontend/backend machine = minimum 1GHz, 2 tuners = 2.5GHz (3GHz
if you want PIP).  Those are optimal specs; you can get away with less, but
667MHz still sounds a bit light.

As far as recompiling, you probably won't get much of a performance increase
merely by recompiling.  The optimizations that truly make a difference for
Myth are MMX-related; both the P2 & P3 support MMX (IIRC).

Someone please correct me if I've misspoken...

-JAC

> -----Original Message-----
> From: mythtv-users-bounces at snowman.net
> [mailto:mythtv-users-bounces at snowman.net]On Behalf Of dmezzetti
> Sent: Friday, May 30, 2003 10:33 AM
> To: mythtv-users at snowman.net
> Subject: [mythtv-users] mythtv recompile because of new CPU
>
>
> Do I have to recompile MythTV if I use another CPU ? I compiled it on a
> Pentium 2-350 MHz but it was way to slow watching Live-TV. Now I built
> in another Mainboard with a Pentium 3-667 MHz. Maybe it's still too slow
> but should be faster than the Pentium 2. MythTV is running without
> recompile but I'm not sure if it uses all the features of the P3 CPU ??