FR: Automatically split recordings after x minutes

[JamesSwift]

Hi, I'm interested in setting a picam to be always recording and then have a cron job to delete the oldest file when the space gets near full. But as far as I can see picam just creates one large file when it records. I could have a cron job start and stop the recording every hour, but then i'd end up loosing some frames. Would it be possible to build some of this into picam directly?