[mythtv-users] MythTV Issues with ATSC

[Jarod Wilson]

On Feb 10, 2006, at 19:18, Richard Shaw wrote:

> Ok, several issues I'm hoping someone can help me out with. First my
> system info...
>
> AMD Athlon XP 2500+
> pcHDTV HD-3000 (for ATSC OTA HDTV)
> MythTV 0.18 (atrpms) on FC4
> Geforce MX4000 64MB video.
>
> Ok, problem #1:
> udev does not seem to set the correct directory permissions on
> /dev/dvb/adapter0. It sets it up with only root (or owner) having rw
> access. Does anyone know how to change this behavior?

That shouldn't be a problem. On FC4 w/ATrpms, mythbackend runs as  
root, so all the necessary rw permissions already exist.

> Problem #2:
> the kernel does not load the right drivers by default. What is the  
> best
> solution to resolve this? I don't like the idea of doing modprobe - 
> r...
> etc... Is modprobe.conf the way to go? I replaced
> alias char-major-81 cx88-blackbird
> with:
> alias char-major-81 cx88-dvb
> but that didn't seem to be enough.

There are some modprobe.conf tweaks you can make, but what they are  
escapes me at the moment. I seem to recall there being a script from  
pchdtv.com that would do it for you.

> Problem #3:
> I can playback HDTV using azap and mplayer fine for the most part  
> (some
> stations are stronger than others), but in MythTV I either get good
> video but buzzing for audio or video that stutters (slows down) about
> once a second.

Your system isn't exactly optimal for MythHDTV, so you have to do  
some configuration tweaking. There's a lot more to it than I can just  
sit down and write at the moment though. Most of it has been covered  
on this list in the past though, so search the archives. Some day,  
when I actually have something that resembles free time again, I'll  
get around to a formal write-up...

> Problem #4:
> MythTV discovered about 38 channles but many of them are duplicates.
> Some have descriptors of <callsign>-DT and the same with <callsign>-HD
> or the like. However when I try to change channels I only can change
> between two. 31 and 32.

You may not have enough signal strength to lock onto the others, not  
sure. Try running the backend in a console window and/or look in /var/ 
log/mythtv/mythbackend for clues as to what's going on.


-- 
Jarod Wilson
jarod at wilsonet.com


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