It is a sort of DIY solution, but cheap:
Wyze 3 camera and a USB power bank. It's billed as a connected,
cloud-based thing, but will cheerfully just record directly to a
microSD card with no internet connectivity whatsoever.
Camera costs $35 and a halfway modern USB powerbank and SD card gives
you about 30 continuous hours of recording in a bog-standard
fileformat without stabilization in 1080p at a low bitrate.
It's outdoor rated (and I've had one running continuously in my back
yard in Pacifica for about 2 months straight, which already makes it
one of the most durable outdoor gizmos I've put in the yard -- nothing
survives our sea fog for long).
There are no off-the-shelf mounting solutions for a bike, but I'd be
happy to 3d print one for SF2G peeps.
Downside: there's no on-camera review of footage, but their phone app
has pretty good tools for review when you do have access to wifi. I'd
suggest making it its own private network since the company's security
history has been a bit of a dumpster fire, but it's entirely possible
to avoid that.
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