I'll admit, I don't understand bitrate as a concept that well. In my head, if you have to display 1000 frames of video at 30 frames per second, then you should be loading whatever data is needed per frame with enough time to spare for a smooth transition. Any faster is uneeded, any lower is deterimental. And it should be deterimined not by a file, but by the processing power of the device playing it. That's the end result when it comes to FPS anyways, right?
Anyways, what bitrate is good for the max quality possible, for both/either 720p, 1080i and p?
Would any other settings change the answer?