I bypassed the above call, and defaulted things to the camera's 640x480.

Then it didn't like the video format (switch around line 120) - UYVY from the camera, YUYV to the loopback.

I get video in the window, but I'm bright green with a purple background...

I just rewrote a "default:" case with different displacements (yuyv as 0123 becomes uyvy as 0123, or y moves from 0,2 to 1,3, u from 1 to 0 and v from 3 to 2).

It works.

Does it do audio?