Changing video resolution using bttv driver

Changing video resolution using bttv driver

I am trying to get the video resolution of 720x576 from IDS Eagle video
capture card which uses uses Bttv878 chipset. The capture card supports
video resolution of 720x576. The problem is that I am always getting the
interlaced video with resolution 320x240.
Can someone me help in understanding how to configure Bttv Driver to get
video resolution of 720x576.
OS: Ubuntu 11.04 Capture Software: c++ application that uses video4linux