I am cycling through four USB webcams, and capturing a frame each time I access a camera. I set the focus and exposure prior to capture with an imaq dx property node. As a forward note, I'll add that this phenomenon happens independently of the capture being Grab or Snap- in other words- this happens in both cases.
As I cycle through the cameras, sometimes all four will have successfully changed their exposure- sometimes only three- and sometimes none of them will have changed their exposure. I've placed waits in the flat sequence I am using (to wait for the exposure to change), and no amount of time seems to help. I hesitate to write out every combination of setup I have attempted to rectify this "sporadic exposure reaction", but it's been a couple weeks of trying things on and off.
Currently, the system is setting the attributes twice and grabbing the image twice. Saving/using the second grab to run through an algorithm. I will attach the VI; however it is in LV16 so, I'll throw in the screencaps, as well.
If anyone has had this issue/knows what I'm doing incorrectly/knows this is a common issue with usb cameras and the imaq dx drivers, please let me know!
