[mythtv] avcodec pre-encode deinterlace patch

[Chris Lack]

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This substantially improves the quality of mpeg4
videos exported from mythtv via the patched mencoder,
at least with my capture card.  It seems to add about
5-10% overhead on my machine.

Is anyone currently maintaining the mythvideo module? 
I'd like to do some things to it if no.

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