Those really in the know won't be buying Amcrest or running higher FPS (with a few exceptions)
Mainly because Amcrest are consumer grade cameras and with folks chasing MP over performance, to keep the cost down they are putting higher MP on sensors designed for lower MP cameras.
As such, the little processor can't process higher MP and higher FPS. One or the other....
Plus, those of us that really know what we are looking for are not going to chase FPS and we chase sensor size.
Shutter speed is more important than FPS. I capture plates at 8FPS and the plate is in and out of the field of view in about a half second (so I capture 4 frames) because I am using the correct shutter speed for the task at hand.
I bet every camera you got is on a MP/sensor ratio that is in the red and as such will perform poorly in low light:
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We are not making Hollywood movies with these things.
These types of cameras are not GoPro or Hollywood type cameras that offer slow-mo capabilities and other features. Some "offer" 30FPS and 60FPS to appease the general public that thinks that is what they need, but you will not find many of us here running more than 15 FPS; and movies are shot at 24 FPS, so anything above that is a waste of storage space for what these cameras are used for. If 24 FPS works for the big screen, I think 15 FPS is more than enough for phones and tablets and most monitors LOL. Many of my cameras are running at 12FPS.
Sure 30FPS can provide a smoother video but no police officer has said "wow that person really is running smooth". They want the ability to freeze frame and get a clean image. So be it if the video is a little choppy....and at 10-15FPS it won't be appreciable. My neighbor runs his at 30FPS, so the person or car goes by looking smooth, but it is a blur when trying to freeze frame it because the camera can't keep up. Meanwhile my camera at 15FPS with the proper shutter speed gets the clean shots.
We wouldn't take these cameras to an NBA game to broadcast, nor would we take the cameras they use at an NBA game to put on a house. Not all cameras are alike and the approach of "a camera is a camera" mentality will result in failure. Another example, I can watch an MLB game and they can slow it down to see the stitching on the baseball. Surveillance cams are not capable of that. You need to find a camera for the intended purpose.
Watch these, for most of us, it isn't annoying until below 10FPS