[popcornmix]

@MilhouseVH @rbjej

I'm still struggling to reproduce the gray screen problem, but assuming it is due to "seek_before_zero" patch, I've split it into three independent commits.

https://github.com/popcornmix/xbmc/commi...efore_zero

I'm guesing that:
https://github.com/popcornmix/xbmc/commi...b8f8d1c6b4 is safe.
and either the audio or video one is causing the problem. It would be good if you could confirm if just one of these commits causes the problem.