Fast forward avi's

I got a new DVD player and it can play DivX. i burnt all my avi's to disk and started to watch bleach (it was subbed by lunar), and i fast forwarded through the credits but i changed subbers to DB but i cant fast dorward any of the eps.

I have tried other anime as well and i found the same to be true for naruto as my origan subber was AonE but when i went to DB for shippuuden i found they didnt fast forward either.

Recently i have been watching claymore and the fast forwards perfectly fine does anyone know y on DB does it and is there anyway to fix it?