I’ve been tempted to look into existing solutions or maybe even creating my own solution for a dash camera that can also stream live to a cloud or RTP service. The main problem is internet access and bandwidth availability, especially with a multi-channel camera.

Ideally, I’d design something that plugs into a small computer that can be mounted in the trunk and writes the footage and optional metadata from a OBD-II reader or other devices (GPS, accelerometer, etc) to a local SSD pair with replication in place. There would then be a special switch that triggers a cloud transfer of the last few minutes before and a live upload of real time footage until stopped or a loss of power/connectivity. This would be in addition to a local recording being saved to a separate partition. It would act as a black box for a car too.

You could use LTE networks, but they are normally saturated in populated areas or unreliable in rural areas. Starlink is expensive and needs more hardware. Maybe something that just scans for public WiFi or home WiFi would be useful enough.