[mythtv] Updated patch for directshow filters with MythTV (for CoreAVC)

[Alan Nisota]

Andrew Lyon wrote:
> The colour issue remains, "vertical, colour/chroma ghosting" is a good
> description, alan do you see the same on the other sample I sent?
I've been unable to see any chroma problems so far (but I haven't had a 
chance to look at the new sample I got from you).  However, I saw this 
on the Doom9 forum:

    Has anybody tried setting the output color space to RGB32? I want to
    use it because there are problems with the color range in YUV modes
    on NVidia cards (16-235 instead of 0-255). The reason I need this is
    because the Fix VMR9 color range is not working when DirectVobSub
    (or any other postprocessing) is used.

I'm not too familiar with the output formats, but we are using I420 
which is a 12bit format like the other YUV modes.  If this is the 
problem it would explain why I haven't seen the issue on the samples 
I've looked at.  You can try to fix it via:
mythregistercodec -r ~/.mythtv/registry -k 
"HKCU\\Software\\CoreCodec\\CoreAVC Pro\\VMR9Fix" -v "1"

It may or may not work though.  Currently we can only set string values 
for registry keys, and this would normally be a DWORD.  If it doesn't 
help, I'll put together a patch to allow setting the type.  It may be 
that I'm barking up the wrong tree here, too.