I recently updated a bunch of software so I am not sure at this point what is causing this instability. I went from Ubuntu 18.04 to Ubuntu 19.10 and PD 0.49 to PD 0.50 . Gem is version 0.94 . Previously when I selected a device that didn't exist in the pix_video help file I would just not get any output in the Gem window. Now if I select a device that doesn't exist for example device 2 when only my laptop camera exists PD hangs up. I am not clear why but when I send an enumerate message to pix_video if no external camera is selected I get 2 devices ie.

info: device /dev/video0 v4l2 info: device /dev/video1 v4l2

If I add a USB camera I get 4 devices:

info: devices 4 info: device /dev/video0 v4l2 info: device /dev/video1 v4l2 info: device /dev/video2 v4l2 info: device /dev/video3 v4l2

Previously before upgrading I would select device 0 for my laptop camera and device 1 for a USB camera. Now I have to select 0 for my laptop camera and device 2 for an external camera. I can live with that but the fact that it hangs up if I send the wrong device number is a bit worrisome. Any thoughts on what is going wrong here and how I might fix this.

Thanks,

Jim