If I don't forget tomorrow, I will provide you with the original parking video file from the main camera.
Karagandinez has provided me with some parking video, and the 15fps is definitely not smooth, every 6th frame is about a third the time period of the previous 5, so it appears to keep almost pausing every 6th frame, then you have 5 frames played back faster than they were recorded, before another pause.
It's not a huge problem, since it corrects the timing error almost 3 times per second, so never gets too inaccurate, but playback would look a lot nicer if it was smooth, and with only 15fps, it is far easier to see the imperfection than if it was 60fps with mis-timed frames.
The problem can't be seen when there is no movement, but is apparent when the red car reverses out at around 10 seconds into the video.
15fps is half the normal 30fps, it should still play smoothly and the car should move smoothly, even though you should be able to see individual frames.
Raw video file, straight from the camera:
drive.google.com