Typically what cameras like the Edgertronic do are have 8-16 GB of onboard DDR3-4 RAM and write raw frames directly to memory on a trigger or a loop/trap. Then when you have X amount of frames you want, process them using ffmpeg/gstreamer using onboard hardware acceleration methods and write to an SD card / network drive / attached SSD or similar. Simply bind X GB of RAM to a memdisk and write to that path in Linux, for example.

I am fine doing this and have done it using raspiraw and know the Edgertronic platform / source code very well. The problem is that sensors and MIPI lanes on commercially-available products are complete trash with even worse documentation.