FPS - in reality...
- Thread starter joshwah
- Start date
bigredfish
Known around here
Not an ideal scene. I’ll try and get face shots at about 16-20 ft from the other camera (4KX)
Unless @wittaj is willing to swim across the canal and hold up a sign
Unless @wittaj is willing to swim across the canal and hold up a sign
Not an ideal scene. I’ll try and get face shots at about 16-20 ft from the other camera (4KX)
Unless @wittaj is willing to swim across the canal and hold up a sign
I'll pass LOL. I am sure I make good gator meat LOL.
Mike A.
Known around here
- May 6, 2017
- 4,141
- 6,946
If you have one, maybe prop up a box with some large text/image/colors, etc., on it where the red planter is. That's what I'll use sometimes to check focus. I've printed out camera test charts before and that's pretty much a waste of time with these cams. Even at its best it still looks crappy and can't really distinguish things at that level.
It is difficult to see much difference because 16 Mbps is a very strong bit rate for 4K@30 FPS (for a fixed camera) so you aren't really starved for bit rate at the higher frame rate.
If you lowered the bit rate to, say, 4000 Kbps for those tests, there would likely be a much greater difference.
Nonetheless I have cherry-picked a few places that I think are clearly suffering noticeably from the lower frame size at 30 FPS. Notice how you get some blurry patches where small regions were encoded at noticeably lower quality on the right (30 FPS side).
If you lowered the bit rate to, say, 4000 Kbps for those tests, there would likely be a much greater difference.
Nonetheless I have cherry-picked a few places that I think are clearly suffering noticeably from the lower frame size at 30 FPS. Notice how you get some blurry patches where small regions were encoded at noticeably lower quality on the right (30 FPS side).
bigredfish
Known around here
bigredfish
Known around here
Exactly what I have been saying all along LOL
Now of course lots of other variables do come into play - field of view and what it is trying to display can impact that, along with the capabilities of the cameras - some don't allow higher bitrates so that should be taken into consideration when determining the FPS to run.
Some cameras and a field of view may not be as obvious as others. Certainly ones eyes and monitor come into play as well.
For example, a 4K budget cam shoved on a 1/2.8" sensor where the camera is limited to 8,192 bitrate will perform better at a lower FPS because of this.
Conversely a 4MP camera on the 1/1.8" sensor that can run say 8,192 bitrate for 15FPS and 16,384 bitrate for 30FPS may not be as obvious, provided the camera isn't being maxed out on other specs like too many AI rules or ROI or some other CPU intensive feature.
But I think the takeaway is similar to what we say on determining what bitrate to use - start at the benchmarks we mention and then go up and down until you find that sweet spot for your field of view. If your eyes and monitor cannot distinguish between 8,192 bitrate and 16,384 bitrate then no reason to use the higher bitrate.
So the same with FPS - try different rates and then do a freeze frame and see if you see a difference.
And also try digital zoom - you may get by with more digital zoom at lower FPS.
As I mentioned, on an older 2MP camera model that I have and my neighbor has, we are both seeing essentially the same field of view and have the camera set up identical, except he uses 30FPS and I use 12FPS and his freeze frames are blurrier than mine. I think for this very reason.
