I ran across a post just recently where someone else did just that, only the script (as I understand it) is capturing an image every 10 minutes (not every 15 seconds), but since it’s a script, it could be modified to suit a different interval.
Also, since it’s written for Linux, all the software it uses—including the operating system itself—is free, and it doesn’t require permanent installation to a PC. This is something that could be written to a USB thumb drive and booted when needed for this specific purpose.
What really surprised me about the original post was this:
You didn’t say (and the topic isn’t tagged for) which camera(s) you’re using, but as far as I know the Cam v4 is the only Wyze model (so far) rated for 512 GB microSD cards, though I’ve read of cards of that size being used in other cameras. If you’re getting successful recordings with 1 TB cards, that seems pretty awesome.
Apparently it’s actually still there. Right now the question seems to be how badly you want whatever end product you were seeking and what you’re willing to do to achieve that goal.
Neither can I. This is something I should put on a list so I at least have some experience with it. (I have concatenated batches of 1-minute video files together from a card, but that’s a different matter.)