The driver provides multiple inputs, each of which is a different test pattern. So far I've implemented three test patterns: a standard NTSC color bar pattern, a bouncing ball, and a text box describing the current settings and counting the frame number.
MythTV will only use V4L2 for the cx88 driver, so to test it with this driver you'll need to apply the quick hack from http://chestnut.mit.edu/mythtv-v4l2.patch
The driver tarball is available at http://chestnut.mit.edu/dummy-v4l2-0.1.tar.gz
It will only compile against 2.6.10 or newer kernels, and it has only been tested on 2.6.11.3.
If you have any qualms about your system crashing, I strongly advise you to run it in UML (user mode linux). If there is interest, I'll write a howto on setting up mythbackend with a dummy-v4l2 driver in UML for debugging.
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