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Camera Feedrate Jump
Posted: Thu Jan 23, 2025 2:54 pm
by ameterasu
Hey all, I'm running 1.36.35 and I just figured out that the feedrate of cameras are jumping 3-4x inbetween fps updates. Example camera was feeding 150kB/s, 550kB/s, 150kB/s , 550kB/s, 540kB/s, 150kB/s.
What can i look into to diagnose this? I tried various settings in Hikvision camera settings nothing worked. I also see that when i change the resolution of the camera this rate is not chaging.
I tried to attach as much information as possible.
- New Project.jpg (56.15 KiB) Viewed 1860 times
Thanks in advance.
Re: Camera Feedrate Jump
Posted: Thu Jan 23, 2025 9:20 pm
by dougmccrary
I'm not sure there's a problem here.
That transmission rate will vary depending on the compression and changes in the camera field.
However, I think it might be better to set the I frame interval to a multiple of the frame rate, say 16.
Also, it's said that it's best to leave the colorspace at 32 as the decoding is optimized for 32.
Re: Camera Feedrate Jump
Posted: Thu Jan 23, 2025 9:43 pm
by ameterasu
Thanks for the suggestions, i will update iframes and colorspaces on your suggestion.
The image coming from the camera was static. These are indoor cameras looking at a storage area.
I find it weird to have same static image delivered at 150kB/s for 10 seconds and 550kB/s for 20 seconds and so on.
Re: Camera Feedrate Jump
Posted: Fri Jan 24, 2025 12:54 am
by dougmccrary
image delivered at 150kB/s for 10 seconds and 550kB/s for 20 seconds
What is reporting that?
Re: Camera Feedrate Jump
Posted: Fri Jan 24, 2025 2:34 am
by Andyrh
What is the keyframe interval? The key frame is a complete picture, the following frames are changes to the key frame. In a static image the key frame will be much larger than the following frames.
I have my key frame interval set to 1 sec.
Re: Camera Feedrate Jump
Posted: Fri Jan 24, 2025 9:59 pm
by ameterasu
dougmccrary wrote: ↑Fri Jan 24, 2025 12:54 am
image delivered at 150kB/s for 10 seconds and 550kB/s for 20 seconds
What is reporting that?
Zoneminder Gui under Function. I keep refreshing the page.
- chrome_wss1Dl3sGA.png (1.58 KiB) Viewed 1709 times
Andyrh wrote: ↑Fri Jan 24, 2025 2:34 am
What is the keyframe interval? The key frame is a complete picture, the following frames are changes to the key frame. In a static image the key frame will be much larger than the following frames.
I have my key frame interval set to 1 sec.
It was 15 and the cameras were set to 8fps at the device. Too frequent i think compared to what i see.