The latest umplayer can support the playing of hd videos (h264 etc) with hardware decoding?
I have two vga cards: intel hd + nvidia geforce gt335-both support the h264 decoding.
I'm 99% sure that it supports hardware decoding of h264 and many more formats trough DXVA. It uses latest FFmpeg.
You can double check this by checking cpu usage during playback with your process manager.