[mythtv] [PATCH] transcoder update

[Geoffrey Hausheer]

This patch is the first step in the road to adding MPEG2->MPEG2 support
to the transcoder.

It removes most of the transcoding code from NVP, placing it in its own
file in the mythtranscode directory where it is more appropriate.  There
are a few hooks that are needed in NVP, to get direct access to the
decoder, but not many.

The ReencodeFile procedure has never been useful for anything except the
transcoder, so moving it away from libmythtv makes sense.

There should be no functionality change, except for better memory cleanup
on program end.

This also sets the stage for allowing me to integrate the mpeg2cut code
more cleanly (it can live in mythtranscode instead of libmythv now)

I figured I'd submit this section first, since (a) if Isaac doesn't like
any part of it, better to know now than later, and (b) it'll let me sort
out any bugs in the code seperation without throwing any new paths into
the mix.

I've tested most of the code paths, and haven't found any discrepencies
so far.

Please apply, or let me know what changes you'd like.

Thanks,
.Geoff
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