So I've had a fixation with onboard looping video and I've gone through the normal progression of devices, first attached to the helmet, then to the bike. I think I've finally found something I like. It's a
pair of mirrors I stumbled across on Amazon that have a video camera built into the right side mirror, which is hardwired to a switched supply. It starts recording when you turn on the bike, and stops when you turn it off. 32 Gig micro SD card allows for 140 minutes of total record time, looped in 3 or 20 minute segments. 720p, wide angle view is perfect.

I used the mounting brackets from the CBR mirrors that I had, and drilled/tapped them for the M10 size of the new mirror threaded ends.




Two LEDs in the lower corner (green dots) indicate power and recording.


Here is a commute video from today. You can tell the camera is rotated a little from horizontal, so I need to fine tune the orientation. The adjustments are only in two directions; the mirrors rotate on the end of the stalk, but do not flex inward or outward, so I will need to actually bend the stalk a small amount (less than a few degrees) to move the field of view (of the mirrors) towards my shoulders a little bit so I can see more of what's behind me.
https://youtu.be/KBzyZuJtEXUVery pleased with the simplicity of the install, and dual purpose of these mirrors. I would prefer a little different shape and better aesthetics, but they aren't bad for $50.
edit: the sound is very low on purpose. It's not great quality, as expected, but it does record sound.