[mythtv] Plextor ConvertX MPEG4 skip ahead/back not seeking tokeyframe

[Mark Spieth]

> I just tried Mark Spieth's generic libavformat seek patch (5) but it 
> didn't make any difference.
> 
> Oh well, the patch shows me where to start looking for the problem.  I 
> can post a small sample .nuv if anyone wants to take a look :-)
> 
still looking at this. patience ;-)
The blockiness problem will be solved. (eventually)
mark