On 01/27/2006 01:07 AM, Robert Johnston wrote: > On 1/26/06, Dylan R. Semler <[EMAIL PROTECTED]> wrote: > >> For analog, the picture quality is pretty bad (noisy) and there are >> about three or four horizontal lines at the top of the screen that have >> some random patterns of black and white streaks. The picture quality is >> much better using tvtime and those lines do not appear. >> > As for the noise, make sure that Myth is tuning into the same > frequency (EXACTLY the same frequency) as TVTime is. It sounds like > Myth's off by a few Khz. > Being off by a few KHz shouldn't matter. Many of the NTSC cable channel frequencies are off by 12.5 KHz (and the same goes for IRC, and HRC varies by 5-15KHz), but the tuner hardware's fine-tuning mechanism should still be able to find the appropriate center frequency. See http://www.gossamer-threads.com/lists/mythtv/dev/164614#164614 (which was totally ignored by the guy complaining in Trac that the frequencies are off) for an in-depth listing of what frequencies are off and why it shouldn't matter.
If you (Dylan) want to try an academically-correct list of frequency definitions, I'd be happy to create one for you (against SVN--just let me know which frequency list you're using: ntsc_bcast, ntsc_cable, ntsc_hrc, ntsc_irc (I'm assuming NTSC based on your e-mail address)), but you'll have to do all the testing because I don't have any RF-modulated sources. Or, to find out if it's worth testing a more precise frequency list, play with the fine tuning values in Myth for the affected channels. And, most importantly, make sure you're using the right tuner definition--just because you get a bad picture doesn't mean you've chosen the right tuner; often it means you've chosen the wrong one. ;) (And, it's completely possible to get a perfect picture/audio on some channels and a bad picture/audio on other channels when choosing the wrong tuner definition.) Mike _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
