I am currently using BM Media Express 2.3 to record xbox game play in HD. At the moment, everything is fine. The only problem is that the window is a bit to small. However, if I go into "full screen mode", the window is significantly larger than my screen in both dimensions.
I have 2 monitors (extended desktop) each outputting 1680 x 1050. No idea if it helps, but I capture movies at 720p @ 59.94FPS.
In COMPACT VIEW, the size of the window is 1296 x 815, and the size of the video view port is about 830 x 480.
In FULL SCREEN VIEW, the size of the window is about 1920 x 1210, and the size of the video view port is about 1050 x 602 (which is still not even close to 720p!).
So far I have not found a setting of any sort to change this. The goal here it to make the video view port window as close to 720p as possible without losing any of window.