I have some avi files that will play on my divx player and some that will not. Is there anything that you can use to open up the avi to see what in it. I am thinking it must the problem with some of them working and some not.
You can try MPEG4 Modifier:
Some XviD encodings have enhancements of the MPEG4 standard that standalone DVD players find it difficult to cope with, such as packed bitstream. MPEG4 Modifier will strip this out but there are others (eg Qpel and GMC) which unfortunately it will not touch.