Since last year I helped a little developing Magic Lantern, a Firmware mod for Canon EOS DSLRs.
I reverse engineered some interesting registers and memory structures that make frame rate patching possible.
(yeah, as always I couldn’t resist reverse engineering the next device I bought :) )
Now I’ve coded a little tool that makes it possible to:
a) Calculate the exact timer frequency that generates frame rate
b) generate custom frame rates
The tool is available here.
Here some screenshot.