Can I change camera parameters on the fly?

[bamoore01]

I have motion plus working and it's working well. Right now I'm running an Arducam IMX462 low light camera on an RPi3. To get good night time pictures I have to manipulate the framerate and EsposureTime in the .conf file. The night time parameters don't give me a good day time picture and visa versa. To switch between the daytime and night time paramaters, I kill motionplus and restart it with the proper .confile from a pythton script. I'm not sure this is the best way to do this but it works for now. One of the draw backs to this is that the video stream is interupted and has to manually restarted every time I restart motionplus.

There are a few things that I would like to be able to do but I'm not sure if they are supported in motionplus.

1. I would like to retrieve a value that represents the brightness of a video frame so that I can adjust the exposure. I do this on another project that uses picam2 and it works. Currently, I'm switching based on sunrise/sunset times. that could really be improved on.
2. Can I change the camera control values like ExposureTime and framerate on the fly. This way I don't have to kill motionplus just to change a value.

Ideally, I would like to read a brightness level of an image frame and keep bumping the exposure time and framerate as the world gets darker and lighter.

Thanks for any input.

[Mr-Dave]

Yes you can change the parameters and once they are submitted Motionplus will restart the camera to invoke the change.

The example uses framerate but it would apply equally to v4l2_params (may need to be careful about quotes). You could also change it via the webcontrol page and view the motionplus logs to see it being implemented.