Re: Car cameras
I have one that I bought from China for $40 (£20), they're not bad. It comes on and starts recording when I turn the ignition on.
At the moment it is set for 720p definition (ie HD) but it can be set as high as 1080p or as low as VGA (640 by 480 pixels). At 720p with a 32Gb micro SD it can record for just over 3 hours and obviously considerably more with VGA or less with 1080p.
It can be set to record for a fixed period and keep overwriting the recording it makes but I haven't tried that yet because I rarely drive for more than 3 hours at a stretch (that is the about the time from Wollongong to the southern part of Canberra where my daughter lives or just over 260km)
Because of the way it auto starts I have a lot of video of me reversing out of the garage then getting out of the car and shutting the gates.