[mythtv-users] Firewire in Myth

[matt mead]

Brian Meehan wrote:
> I've been watching this discussion in hopes of learning something to
> get my firewire capture running too. I also have no picture, but I've
> noticed that the channel changing is crazy. I have channel 09 set as
> the startup channel for firewire input (local cable news broadcast,
> probably not 5C encrypted). The SA3250 changes the channel to 48. ???!
> When I set it to channel 508 (G4 TV) it changes to 13hundred
> something. But it's always consistent. Channel 9 is always channel 48.
> Channel 508 is always that 13xx channel. I'll try some more and see if
> I can find a pattern.
> 
> Could that be the patched channel changer you were talking about? I'm
> running Myth from ATRPMs on FC5.

The behavior you are seeing is similar to what I saw when I allowed mythbackend 
to use its internal channel changing code for my SA3250HD.  I too would get 
changes to channel 48 for a lot of different channels I tested on.

I am attaching the diff for my changes to mythtv/contrib/sa3250ch.c.

You'd have to grab sa3250cs.c from svn, patch it, compile it, and install it 
somewhere, then in the mythtv-setup screen (I believe it's when you link the 
video source to the capture card) where you can define an external change 
channel command, you put the full path to sa3250ch that you built and installed.

I got this patch from someone in the #mythtv-users channel.  Their SA3250HD had 
a different vendor id as displayed when using gscanbus, so they updated the 
sa3250ch.c to recognize the particular vendor id of their hardware.  Mine 
matched the vendor id already in sa3250ch.c, so I left it alone and just made 
the changes to the code that sends the commands.


-matt

-- 
matt mead

http://collectivity.goof.com/
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