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

[Peter van Rensburg]

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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