Unable to use v4l2-ctl to update gain about tiscamera HOT 2 OPEN

Quick update: I tried to capture by writing a c++ program to capture image via v4l2. In the program I set gain = 8. However, I noticed the gain seems to bounce back to a certain value and stopped. So looks like there's some internal register (most likely gain_auto 0x0199e205 (bool)) that is controlling the gain and we are not able to program it via v4l2?

from tiscamera.

Hello

the missing properties are not known by v4l2 by default. Thus we made some udev rules, which add these properties to v4l2. You can follow the article at https://wiki.theimagingsource.com/index.php/Using_USB_2.0_CCD_Cameras_in_Linux, even if it is for using one of our older camera models. The udev file contains the rules for the modern cameras too.

As you can see in your listing, gain is expected to have a range from 0 to 240. I suppose, you will get this range after installing the udev rules.
The 0x0199e205 is for gain auto. If gain auto is enabled (true), then it always will override a gain (0x00980913 ) value you try to set.

Stefan

from tiscamera.