For H264 in other container formats including mkv, mp4 and mpeg-ts, mplayer+CoreAVC simply gives me black frames.
Here is a patch that would solve this problem. It comes from a fork of mplayer named mplayer-ww. Their builds has no such problem. Their link here http://sourceforge.net/projects/mplayer-ww. I made this patch from their source.
I sent this to mplayer-dev-eng but so far I've got no response. Get the patch here http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/attachments/20081027/5308237f/attachment-0001.obj