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?



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.

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.