[mythtv] Patch for Via XvMC VLD QMatrix Decoding

[Terry Barnaby]

Hi Isaac,

We have done a fair bit of testing of the ViaXvMcVLD hardware decoding
interface
now. This patch fixes the QMatrix code (although there may still be some
issues
with particular MPEG streams). It also fixes the header file name which has
now changed.
I also enclose an updated document on using the XvMCVLD acceleration.

The only problem I am seeing is a motion jitter casued by MythTv's
synchronisation
system. More on this latter.

Terry
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