[mythtv-users] Locks Up and Slow Performance

JC johnmythtv at crombe.com
Fri Mar 21 04:03:48 UTC 2003

Hi Jason,

You say that you got a pretty decent output with your G200 at 320x240.  I
assume you mean with hardware mjpeg and decimation 2 / 2, right?  That's the
card I have right now, and that's as high as I can get the resolution.  I
have a P3-800 and plan on buying a new Athlon 2000+ or more this weekend to
be able to up the resolution.

Are you saying that you couldn't do Decimation 1 with your Athlon XP 2100+
and that card?  If so, why not?  I was really looking forward to 640x480!
If you've given up on the hardware MJPEG for the G200, are you still using
that card to do the RTJPEG or MPEG4?  For me, that's the only card I have in
the box, and it does both the capture and TV output.


----- Original Message -----
From: "Jason James" <jason_james_97 at yahoo.com>
To: "Discussion about mythtv" <mythtv-users at snowman.net>
Sent: Thursday, March 20, 2003 6:24 PM
Subject: Re: [mythtv-users] Locks Up and Slow Performance

> --- William Preston <bpreston at networkusa.net> wrote:
> > > On a related note, do other people see weird
> > artifacting using the MPEG4
> > > compression? I get this effect where static
> > elements will drift and
> > > blend into other parts of the frame (the OSD does
> > this very noticeably),
> >
> > You've either dropped some acid or your CPU is not
> > powerful enough.
> > Though the former is preferred, it's more than
> > likely the latter :)
> > Upgrade your CPU or reduce the res you're capturing
> > at and it shouldn't be
> > as noticeable.
> Compared to RTJPEG or MPEG2, MPEG4 files look pretty
> lousy to me, even at high bitrates (I've got mine
> dialed up to 5000K on LiveTV just as a test). It has
> lot of artifacts and fast motion looks really bad.
> MPEG4 also a CPU hog, so I've had to reduce the
> capture resolution on my Athlon XP 2100+ to 512x480
> just so it can keep up. It might be time to
> investigate some overclocking!
> The image quality on the Matrox Marvel G200 TV (MJPEG)
> I was using before was much higher in terms of
> artifacts and fast motion. Unfortunately, that card
> couldn't support resolutions higher than 320x240 or
> so.
> I checked and my system is using XV, so there is
> something else slowing it down.
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