I have a Fly Video TV card and it works fine.
i needed to have appropriate modules though including tuner, saa7134, v4l & i2c.
Once that was all sorted it was just a case of checking the /dev/video0 actually existed
ls | grep vid
and making sure the permissions were okay. I think it defaults as a root device so you might need to chmod 666 it or add yourself to a video group.
reading through http://www.exploits.org/v4l/
will help you loads