no , it's not what u think .. it's true the video pixels are less than N900 screen pixels , but when u use it as a bootscreen , it will be great , cause the video borders are black and the screen in booting is black , so the video appears on booting perfectly as it was full screen ..
I have edited the thread and put a video from my youtube showing the video while booting in my N900 .. it looks great with no borders or something .