How Do You Know? MP4 in AVI format?

I am trying to decide if I want a Sansa e280.  In the specs, it says that the video supports MP4 in AVI format.  How can I find out if the videos I am interested in putting onto a player are in this format?

I have videos that play on my PC that have the MP4 extension… how would I be able to tell if it is truly AVI format?

Thanks!

E

The e280 will convert both mp4 and avi. The files must not be copy protected as in downloaded from an online store. Good info in this post.

http://forums.sandisk.com/sansa/board/message?board.id=smc&thread.id=1

Just to remind you, they convert into to highly inefficient codecs, which turn out to be quite bloated. Don’t be confused, they don’t support playing avis, they only convert it.