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

papenfuss at juneau.me.vt.edu papenfuss at juneau.me.vt.edu
Fri Mar 12 08:19:16 EST 2004

	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?


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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