DS-2CD2087G2-LU G3, ivms show fps jumping from 15 to 25 randomly

[spirch]

I just got a DS-2CD2087G2-LU G3 with latest firmware and while in ivms, when the cursor is on a camera, there is informatin showing up at the top. In the right corner it show bitrate and fps

my setting is h265+ with 15 fps but it randomly jump between 15 and 25 fps

anyone know why?

 

[spirch]

video showing the issue first 10 seconds and comparing it to 3 others(different model) with h265+

 

[spirch]

hmm look like if i switch from video & audio to video only, it stick to 15fps

also, it look like it does 250 meg segment file per 8 minutes on continuous recording, that seem high usage to me

i will go video only for a while and see what happen with the filesize