seek problem on avi on cdrom

[Micha Feigin <michf@post.tau.ac.il>]

I have a divx avi file I created. On disk when playing with mplayer I
can seek with no problem in the file (i.e. jump forwards/backwards).
When I burn the file to cdrom I can no longer seek on the file with the
error
Cannot seek in raw AVI streams. (Index required, try with the -idx
switch.)
The file is of exactly the same size and was burned from the working
file using k3b overburning for a 800Mm cd with one error message saying
io error, not serious.
Any ideas?
-- 
Micha Feigin
michf@math.tau.ac.il