What Harm is pointing out, if you do have the trial, is that it can do nothing with MPEG and that includes Importing it, or outputting to it.
Also, though the body text talks about other things, in case the title is correct, CS4 cannot burn to disc. One uses Encore for that function. It's bundled in the full version of CS4 and is the authoring app for DVD-Video and BD.
Good luck, and let us know if you do have the trial,