[mythtv] playback quality

[Allen T. Gilliland IV]

The quality loss I am getting in the video looks like
the video isn't able to keep up.  The frames have
tears in them that flicker ... not a whole lot ... but
enough and constant.  I am also losing frames
regularly.  I would guess that it is my cpu not
keeping up ... or my HD not keeping up.

I measured my HD speed using hdparm.

#hdparm -t /dev/hda

15MB/s seems awful slow to be doing writes and reads
from the disc constantly ... especially recorded video
and audio.

I am doubtful that it is my video card, tv card, or
sound card ... however I was getting much better
playback on my normal station ... a 2.4GHz + gf4 Ti
... so there is some difference between the two that
is causing this loss of quality.

-- Allen

--- Ray <maillists@sonictech.net> wrote:
> On Sun, Nov 10, 2002 at 01:30:56PM -0800, Allen T.
> Gilliland IV wrote:
> > I've got my mythtv setup and running normal now,
> but
> > the quality is not all that great.
> 
> Could you be a little more descriptive?  Is it
> jerky, slow, lots of
> compression artifacts what?  Does it change if you
> just record and palyback
> later rather than watching while recording?  What
> resolution are you
> encoding at?
> 
> 
> >  I am using my
> > older machine which has:
> > 
> > AMD T-bird 1200Mhz
> > GeForce 2 MX 400
> > SoundBlaster AWE64 ISA :(
> > WinTV-dbx 401
> > IBM 25GB UDMA HD @ 14.81MB/s
> > Gentoo Linux 2.4.19
> > rtjpeg codec
> >
> 
> How was that hard drive speed measured?  At first
> glance I'd say that could
> be your bottleneck.  Do you have any other specs on
> the drive?
>  
> > I am wondering how well this machine should
> perform. 
> > My picture when watching tv on my monitor is not
> all
> > that great ... I am going to assume this is the
> fault
> > of my gf2 MX.  However the card should be more
> than
> > capable of doing 60fps on any resolution with
> better
> > rates than a tv.  Would a radeon or gf3/4 serve me
> > better?
> 
> A faster video card isn't going MythTV one way or
> the other IMHO.  
> 
> -- 
> Ray
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