PROTEST H.264 and MPEG-LA!
try this guide:
works for me for EVERYTHING video....
I only use VLC player.
AMD Phenom 9500 Quad 2.2 GHz Asus M3N78-VM 4GB DDR2 32" HDTV montior
Multi-boot Win7, Ubuntu 9.10, Kubuntu 9.10
smplayer is my personal player of choice.
they all work fine here (mplayer, smplayer, xine, totem, vlc...etc), its the overall interface and controls that puts smplayer way out in front for me.
I'm new to ubuntu and am not very certain,
but it seems these media file downloaded through windows dont work with Xlinx, vlc or sm players.
for example I had down loaded a .flv file through vista which now I can not play on ubuntu players. But when I downloaded the same file through ubunto I could play it.