On 2011-09-05 05:28, Sathish Vasudevaiah wrote:
Hi,
Lately my PVR350 based mythtv setup has one major issue.
In this setup analog cable signal is fed both to the pvr350
card and the TV using a splitter.
Now the problem is there are some channels which look
good on TV but the same channel look very grainy and
blurry in mythtv. But there are also some channels which
are equally good on both TV and mythtv.
Here are few things done but no breakthrough.
- swapped the TV and the PVR inputs, but this made no difference
- Using v4l2-ctl tuned a channel from 885.25 MHz to 62.50 MHz
in steps of 1 MHz and observed the ivtv output. I was looking for
a pattern in the blurry channels frequency, but found none.
- checked the ivtv decoder output (/dev/video0) directly, Same problem
existed.
- changed the recording bitrates iin mythtv recording profiles for LiveTV
- For one grainy/blurry channel, fine tuned on either side of the frequency
using v4l2-ctl. Again no difference.
Can you please give some more ideas for debugging this ?
thanks
holla
Could be a heat issue. Try turning the computer off for a while, then
turn it on and tune directly to one of the channels on which you get
poor quality on the PVR 350.
The splitter probably drops the signal strength equally across both
legs. Try removing it altogether and use a plain coax connector to hook
your PVR 350 up directly to see if the improved signal strength helps
the card.
Could be interference that the card picks up inside the computer. Could
also be a poor quality power supply in the computer. Try the card in
another computer to check these. You could also try rearranging the
expansion cards in the computer to move the PVR 350 away from other cards.
Roger
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