increasing volume on movies?

I have backed up some movies on my ipod and I am playing them in my car and they are not very loud. Is there a way I can raise the volume to hear it better in my car?

 

Are you sending the sound threw the Car threw a FM transmiter, or tape deck?

 

through my fm transmitter.

 

what brand?

 

I have one of the new 30 gig video ipods and i have the DLO transpod fm transmitter

 

Then the only way to turn it up is to turn up the volume on your car radio cause the DLO has its volume set at a strandard

 

I guessed that, but are there any programs i can use to alter the volume of an mp4 file

 

in itunes select all your videos, then click get info, a warnig bar will show up, then raise the volume and click ok