Metadata of avi files

I used the od tool in Linux to look the metadata of mp3 files and avi files by using the command

od -c filename.avi

For mp3 files it is showing all the fields very properly even in sequence. But for avi files it is not showing the metadata fields.

Whether is there is any difference in the way th开发者_运维知识库e metadata fields are stored in avi and mp3 files?

Can somebody tell me some good way of extracting metadata fields of avi files.

GNU lib extractor might be good for what you're looking for: http://www.gnu.org/software/libextractor/