[mythtv] Mythtranscode .mpg => .mpg not .mpg => .nuv

[Geoffrey Hausheer]

Yet another update.

Robin Gilks ran into an interesting problem of streams being
corrupted, which turned up to be another bug in replex when updating
GOP timestamps (basically there is a corner case where a GOP will be
falsely detected in the middle of an image....it has a probablility of
occuring once ever 3000 seconds or so on SD material)

I've fixed that as well, and the updated version is here:
http://www.pblue.org/myth/mpeg2fix-0.6.tgz

Thanks again for the testing, things like this can only be caught be
significant amounts of testing.

.Geoff