Free video editor that accepts MPEG-4?


I had a free version of TrakAxPC but the trial ended so now I can’t import MPEG-4 videos. I tried all of the other video editors in the freeware thread and they don’t accept MPEG-4 to begin with. So do any of you guys know of a free video editor that can import this format?

And if not that, do you know of a free video format converter that can turn MPEG-4 to AVI for videos half an hour long without adding a watermark?