OBS gets confused when webcam is added or removed to system

[ysalmon]

Operating System Info

Ubuntu 20.04

Other OS

No response

OBS Studio Version

26.1.1

OBS Studio Version (Other)

No response

OBS Studio Log URL

I do not understand what that means

OBS Studio Crash Log URL

No response

Expected Behavior

The presence of a new webcam should not cause any disturbance.

The removal of a webcam not actually linked to a video source should not cause disturbance.

The removal of a webcam used by a video source in OBS should cause it to be grayed out or a warning to be displayed or the source just providing any image, without impacting other video sources.

Current Behavior

The association of video sources to webcam gets shuffled : a source will get a different webcam stream, or a source will be in an ill-configured state.
It is not really possible to correct this live, one has to close OBS again and restart it.

Steps to Reproduce

1. Create a scene with several video sources.
2. Select appropriate webcam for each video source.
3. Close OBS.
4. Add or remove a webcam (either a USB webcam or a virtual webcam).
5. Open OBS again.

Anything else we should know?

Here are logs after removing a camera that was used by a video.
With problem ocurring
After selected the camera I want for the main video source and restarting OBS

The problem seems to be caused by the fact that although the GUI shows camera device names, the setting appears to be recorded as /dev/videoX with the number being dependent on whether there are other cameras on the system.

[gxalpha]

Duplicate of #3003