[mythtv-users] Summery of my problems

[Dylan R. Semler]

Michael T. Dean wrote:

>On 01/27/2006 01:07 AM, Robert Johnston wrote:
>  
>
>>On 1/26/06, Dylan R. Semler <dsemler at macalester.edu> 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.
>  
>
Well it's worth a shot.  I'd love to get better picture quality.  I'm 
using ntsc_cable.

>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.  ;)  
>  
>
By choosing the right tuner, are you referring to the setting in 
mythtv-setup -> capture cards?  I have the standard V4l capture card 
selected for analog.