Which codecs does ubuntu-touch support? Can I add restricted-codecs package? I've copied an .avi file to ubuntu-touch, and I can hear it, but I can't see anything.
You can install vlc player. It has all the codecs you need. You can also search for restricted drivers inside system details.
Most of the times, graphics driver comes under restricted category. so if it finds one suitable for your card then it will ask you to install that. Click activate to use that driver. After installation, don't forget to restart once. Hope this helps.