[mythtv-users] picture quality help?
beww at beww.org
Wed Mar 7 13:21:36 UTC 2007
On Mar 7, 2007, at 6:18 AM, John Welch wrote:
> I running ivtv .10 and 18.104.22.168 kernel with mythtv
> 20.1 fixes. My issue is the picture quality on
> channels 2, 4 and 5. I am using Comcast in New
> England. I have tried fine tuning the channels, but
> the defaults frequencies are the best picture I can
> get. I don't believe this to be a mythtv issue,
> because mplayer /dev/video0 shows the same quality. I
> am using a 250 and a 500 in my backend and the quality
> is about the same on both cards.
> I had a similar problem, also with Comcast - North of Boston area,
> when I first setup my Myth box with a PVR-150 card about a year
> ago. My problems were mostly on channels 5 (ABC) and 6 (NECN).
> Unfortunately it was so long ago (at least for my memory) that I
> don't recall the exact steps I took to fix it. I believe I used
> the ivtv tools to tune to the channel. That gave me the frequency
> of the channel. Then I bumped it up by increments of 25 or 50
> until I got a good picture with mplayer. I took the frequency from
> there, went into the mtytv-setup Channel editor, and entered the
> frequency instead of the channel number. The bump up was more than
> I could get with the fine-tuning in mythtv.
> I wouldn't totally discount the other post about a bad cable,
> connection, etc., but I have a feeling that Comcast does something
> funky with some of these low numbered channels.
> Sorry I don't have my exact troubleshooting steps, but I hope this
> info can lead you on the right path.
A problem with channels 5 and 6 is most likely an incorrect channel
table (ie: cable when it should be cable-HRC or vice versa).
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