[mythtv-users] PVR-250: Vertical green bands in recording

[Andy Grundman]

Brad Allen wrote:
>>Wow, that actually worked!  I unplugged the cable, rebooted, then 
>>plugged it back in.  The video looks great now.  I have my cable split 
>>and one feed goes to my cable box and the other to Myth.  When I unplug 
>>the cable from my computer it affects the picture on the cable box, so 
> 
>   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> could be lack of termination.
> 
> 
>>there must be some kind of interference on the line.  When the cable box 
> 
>                         ^^^^^^^^^^^^^^ could be
> 
>>was unplugged yesterday I think that interference messed up the card. 
>>As long as both boxes are plugged in there are no problems, though.
> 
>   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> Typically cable has loss with nontermination.
> 
> You're probably getting that loss.
> 
> There could also be backwards interference from the other devices;
> there are some filters that help stop some of that.
> 
> I don't know what other ways to get '350 to re-tune, but perhaps there
> is SW/driver methods to do it.
> 

I didn't know about that, thanks for the info.  I guess my cheap Radio 
Shack splitter isn't good enough. :)  Oh well, I don't plan on 
unplugging either cable in the near future.  It's interesting that 
people have scripts to automatically fix this problem, meaning it can 
also be caused by something other than the cable loss that caused mine. 
  I'll keep a script around just in case it happens again.