Fix DVDPlayerVideo.cpp

Initially this commit was reverted
(https://github.com/quasar1/boxeebox-xbmc/commit/db1fb741700a231bf1d627a2564dcf6adad2556c)
it caused bad seek and video to stutter on start, (CPU spike). Now
having to re-revert as the merge picked up the previous commit when a
new commit was added. http://boxeed.in/forums/viewtopic.php?f=14&t=483

I'm guessing the original commit caused a high CPU load on video start,
which in turn caused video to stutter. Seek never worked well with the
original commit now it works better, obviously not perfect as we need
trick modes added to the Boxee specific code.
In a word I did what I could to the best of my ability.