GLMixer Code

More BUG FIX in Video FIle : this time, I think its much better : 1) I do nothing special in the refresh timer (so there is no jump/ jerk of picture) BUT, 2) when the refresh timer start to be late on presentation time, it tells the Decoding thread to skip the next frame. This way, 1 or 2 frames later, the presentation time stamp to show is 1 frame later, so we can catch up. (+ compilation complain fixed in Rendering Manager XML).