I've recently installed Ubuntu 12.04. I have installed ubuntu-restricted-extras and ubuntu-restricted-addons, gstreamer0.10-ffmpeg, libdvdread4, libdvdcss2, run the .sh script, and I don't remember what all other packages (but from many tutorials, installed from here and other sources).
I have mp4 files that play in gxine, but not in Movie Player.
Most of the help I see suggests that when this problem crops up, to switch to VLC, gxine, or other player. But I'd like to fix Movie Player to work with these files so I can use a single, easy-to-use player, and not have to rely on other tools.
Can somebody help?