Trouble converting and playing XVID

[Joe Forster/STA]

I think VLC (at least, for the PC) has the XviD codec built into it. But you should try MPlayer (if it has a Mac port) anyway. And isn't there a stand-alone installable XviD codec, too?

You cannot convert XviD to AVI or MP4 because XviD is a compression format and AVI and MP4 is a container format (the two have nothing to do with each other).

You cannot play XviD videos on a "normal" DVD player, only on a DivX-compatible one. But even those may choke on videos that contain extensions to the MPEG-4 standard such as GMC, QPel or B-VOP; you should check those extensions with a software that can show the properties of video files.