[mythtv-users] PVR250 quality problems, tuner vs comp

[papenfuss at juneau.me.vt.edu]

	I've posted a few times about the PVR250 quality I've experienced.  
It's pretty good, but never as good as watching directly on the TV.  I ruled 
out the tuner in my case, however, since it looked the same with composite and 
svid.  Your problem may be different... what revision pvr250?

-Cory

On Fri, 12 Mar 2004, Peter van Rensburg wrote:

> Hi all,
> 
> I've played around a bit with my new box and
> everything except for the remote is working great.
> Atlast I have digital audio, silly Comcast boxes...
> 
> Anyways, the capture quality leaves a little to
> desire.
> 
> Tuner:
> http://www.pbase.com/image/26844858
> 
> Composite:
> http://www.pbase.com/image/26844856
> 
> The images are skewed since I had to turn off hardware
> acceleration in bloze to capture these screenshots (if
> anyone got any better ideas, besides installing xine,
> please let me know). The problems are _much_ more
> pronounced viewing on the TV. Look at the red TV guide
> box on the tuner input, the colour bleeding is pretty
> bad. Even after playing extensively with the
> brightness/contrast controls using test_ioctrl I could
> not get the quality to nearly match that of the
> straight feed from the cable box. The image is a lot
> softer after capturing and colour bleeding is
> definitely a problem using the tuner input, composite
> is not bad, but of course with composite I get no
> digital sound and some 50hz interference as the noise
> rejection of coax is a lot higher than composite. 
> 
> These were captured using the default DNR settings
> using the device directly (cat /dev/video0 >
> /movie.mpg) and IVTV 0.19. It looks like some sort of
> filter is being applied, the noise is definitely lower
> but at the price of some sharpness (contrast and
> brightness are pretty low too). 
> 
> Does anyone have some insight here on how to improve
> image quality?
> 
> I'll post this on ivtv mailing list too, although it's
> pretty dead
> 
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