Hikvision oem / clone - Frame rate drops in low light

[scoob8000]

Picked up a cheap 4k ptz cam that seems to be a Hikvision h5 OEM most likely.

I'm set for 15/1 FPS on main and substream but I'll occasionally notice in blueiris it drops to 12/.8

I suspect it's happening during lower light to try and brighten up the image, but I'm stumped trying to figure out which setting it is causing it. I've tried changing image mode from normal to forced frame rate but that doesn't seem to make a difference.

Screenshots of settings.

 

[TonyR]

I'd try H.264 vs H.265.

 

[scoob8000]

I'd try H.264 vs H.265.

I just switched it. I'll check this evening and see if it peters out again.

Some of these cheap cams I feel like the processing power limits them. If you enable any of the built in AI stuff, or use the high encoding profile it kills the frame rate.

 

[wittaj]

Yeah that is why we recommend not using any of the Smart or AI codec if using BI. That AI codec will slow down frame rates and other things and throw the yellow caution triangles.

And some cameras algorithm is just set up to override user parameters in order to give the bright static image.

 

[scoob8000]

Yeah that is why we recommend not using any of the Smart or AI codec if using BI. That AI codec will slow down frame rates and other things and throw the yellow caution triangles.

And some cameras algorithm is just set up to override user parameters in order to give the bright static image.

I've definitely run into that smart codec crap before. One of the reasons I hate reolink. The one I tried years ago you couldn't disable it.

I think I have everything disabled that I can on this cam I'm testing out.

 

[scoob8000]

Got to the bottom of it. Had to do with shutter speed. I hadn't got around to tweaking these yet for this cam. It was on default auto. At night it would go to 1/10s as auto was allowing it. At 1/10 it cuts the frame rate.
Sadly I cannot seem to control shutter speed via blueiris with this cam like I can my others. As a work around, I left it at auto but set the lowest for night to be 1/30. That brought me back up to 15/1 FPS. Not really impressed with this cam so far.