Hello. I was wondering if anyone has seen or has any suggestions for my issue:
Can't say that I have seen this such an issue, but I do have the following suggestions, statements and questions that might help you progress towards resolving the issue.
I have MythTV with an ATI DTV Wonder capture card. I ran the channel scan and it found all of the expected channels, however the channels have many verticle purple digital looking lines, making the picture unwatchable.
Just to be clear (because you also discuss analog later on), the channel scan you did was for digital channels on cable and the reception problem with the purple lines you're referencing is strictly related to the digital channels, and not problems in the analog channel reception?
Remove MythTV from the equation, and drop back to stand alone apps for testing (see next suggestion).
I tried to run dvb-apps scan tool, but it output a TON of stuff. What should i do next?
the scan tool will output both encrypted and unencrypted digital channel/services it finds and you'd have to go through them one by one (writing the output to a channels.config and then using something like xine, Mplayer...) or...
I'd suggest using a standalone digital tv app like Kaffeine or MeTV -- both have built in scanning and probably be easier to go through the discovered services (from memeory, offhand, I don't think either includes the encrypted channels by default). Anyway, testing with one of these standalones should be done anyway to see if you also get purple line in these use cases too.
Note: I also have a dual analog tuner card that works ok, however there is alot of fuzz in the picture. (maybe its just the card in the PC?) the signal looks better when plugged directly into the tvs analog tuner.
P.S. this is for comcast cable, so it has both analog and digital channels on it.
In reference to the analog card's reception, sure, it might be picking up noise from somewhere inside your computer and introducing it into the signal....You could try with tvtime to see if you get better results that way -- its postprocessing will generally produces the best output for analog tv reception. Also, if you have any swithes/splitters or anything else, you could try removing them and testing with the cable straight into the analog card.
Another issue that crops up from time to time with PCI cards is dust in the PCI slot -- though that usually manifests itself in other nefarious ways then what you have described. Still, as a basic step, you could always take the cards out, blow out any dust and then re-seat them (PITA, but relatively easy enough to do).
I might be helpful if you can capture a screen cap of your purple line issue and post it somewhere for others to have a look see.