[mythtv] HD H264 decoding with multiple threads

[Terry Barnaby]

I have just "updated" my systems to Fedora 12 and MythTv 0.22 (from RpmFusion 
RPM's). Previously I was using Fedora 11 with MythTv from SVN from around 
December 2008.
In order to get smooth HD playback on my Intel G45 frontend (from freesat
BBC-HD) I had set MythTv to use 2 CPU's in FFMPEG to decode the H264 stream.
With my current setup MythTv only appears to be using 1 CPU for H264 decode.
It does appear to use 2 CPU's for SD MPEG2 decode however.
Using "mythfrontend -v playback" the log states "Using 2 CPUs for decoding" so
all looks to be configure Ok.

Any ideas on what is wrong here ?