Just a little note, how to grab dv avis on Linux.
If your System is not configured properly you perhaps need to be either root or to make it accessible for your current user (until next reboot) by using chown:
If nothing is listed, try to load the kernel module
If you need to capture a video by using the camera's dv digitizer but it starts to play, use the interface-mode to control dvgrab
The most important controls are:
Esc=stop
c=capture
q=quit
Other issues
Check if firewire modules are loaded