i think H264 is just not supported. same with mpg2 divx and so on.
the reason is its not really scratchable.
h264 is an mpg4 codec, great for small files, but not every frame is encoded, even in aftereffects you will get problems.
search forum for best codecs.
but myself would like to see resolume to support these codecs, because some large clips, i like just to play, no scratching and so on. if i have a video with the length of half a hour, mjpg or indeo makes the filesize to big. other vj programms can deal with these codecs. so why not resolume?