I'm trying to connect my canon dslr as a web cam to ubuntu following this advice: Using a digital camera ( Canon) as webcam
However, KDE Plasma keeps on mounting the camera, thus gphoto can't use it. Unmounting/ejecting it via nautilus or dolphin doesn't help. When I do so the camera is "unmounted" and the only option in the context menu is to mount it again.
However, gphoto still can't access the camera: pipe:: Invalid data found when processing input
What helped me was disabling auto mount in the KDE settings:
I did so by removing the gphoto text, which is selected in the screenshot. I also did so in the Mit Dateiverwaltung öffnen entry.
I know this isn't very elegant, but it works.
On a side note:
Coincidentally I ran into the problem of my camera not being able to be used as a live stream camera again.
I ran sudo modprobe v4l2loopback && gphoto2 --stdout --capture-movie --debug and the output (along many other lines) was:
0.089319 gp_camera_capture_preview [gphoto2-camera.c:1404](0): 'camera->functions->capture_preview ( camera, file, context)' failed: -6
FEHLER: Film Aufnehme Fehler ... Beenden.
I scrolled further up and noticed some other device being listed there as well:
0.062068 gp_camera_set_abilities (2): Setting abilities ('Samsung Galaxy models (MTP)')...
0.062079 gp_setting_set (2): Setting key 'model' to value 'Samsung Galaxy models (MTP)' (gphoto2)
Then I realized that this must be a smartphone I also had connected via USB to my pc, which I almost forgot about. I unplugged it and the gphoto2 command worked again as usual.