Alex can analyze the footage recorded by the 3rd party recorder and needs the following:
This kind of script is helpful to execute during HDMI recording:
#stop HDMI stream: fil_reg 15 0 #capture image ./cmv_snap3 -r -2 -e 10ms > image.raw12 #start HDMI stream: fil_reg 15 0x01000100
Taking a snapshot during HDMI recording with the above script will pause the HDMI stream for a few seconds, where it will alternate between two frames. These two frames will be from the same raw data as image.raw12, so they contain all that's needed to figure out what kind of processing the HDMI recorder applies to the image, and how to undo it in order to recover the raw data.
Ideally, the scene should contain fine details (such as tissue, fine print) and rich colors. A color chart (which usually contains some fine print as well) is a very good choice.