Inconveniently sized media files

[William O'Higgins Witteman]

I'm looking for a way, preferably from the command line, to make mp3 or
avi files either split into smaller chunks, or combine into contiguous
ones.

For instance, I have a long video presentation in two avi files -
I'd like it to be one big file, but I haven't found a way to do it (I
tried cat-ing them together, and I got one big file, but it wouldn't
play past the boundary of the first file).

In a different for instance, I have an mp3 which is a hour long, and I
want to split it into 5 minute chunks (for easier stopping and resuming
on my mp3 player).  Are there tools for this?  Thanks.
-- 

yours,

William

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <http://gtalug.org/pipermail/legacy/attachments/20060220/87a8a437/attachment.sig>