I have 2 webcams, if I connect both guvcview allows me to choose which one to 
use, camera chooses without asking.

If I connect my second camera the messages change:
corrado@corrado-n7-nn-0408:~$ snapshot
2024-04-09T12:21:10.548208Z  INFO snapshot::application::imp: Snapshot 
(org.gnome.Snapshot)    
2024-04-09T12:21:10.548228Z  INFO snapshot::application::imp: Version: 46.0    
2024-04-09T12:21:10.548231Z  INFO snapshot::application::imp: Datadir: 
/usr/share/snapshot    
2024-04-09T12:21:10.922843Z ERROR aperture::viewfinder: Could not start 
camerabin: Element failed to change its state    
2024-04-09T12:21:10.924966Z ERROR aperture::viewfinder: Could not start 
camerabin: Element failed to change its state    
2024-04-09T12:21:10.925607Z ERROR aperture::viewfinder: Bus Error from 
Some("/GstCameraBin:camerabin0/GstWrapperCameraBinSrc:camerasrc/GstAutoVideoSrc:camerasrc-real-src/GstPipeWireSrc:camerasrc-real-src-actual-src-pipewir")
stream error: error output enum formats: Invalid argument
Some("../src/gst/gstpipewiresrc.c(689): on_state_changed (): 
/GstCameraBin:camerabin0/GstWrapperCameraBinSrc:camerasrc/GstAutoVideoSrc:camerasrc-real-src/GstPipeWireSrc:camerasrc-real-src-actual-src-pipewir")
    
2024-04-09T12:21:10.925628Z ERROR aperture::viewfinder: Bus Error from 
Some("/GstCameraBin:camerabin0/GstWrapperCameraBinSrc:camerasrc/GstAutoVideoSrc:camerasrc-real-src/GstPipeWireSrc:camerasrc-real-src-actual-src-pipewir")
Internal data stream error.
Some("../libs/gst/base/gstbasesrc.c(3175): gst_base_src_loop (): 
/GstCameraBin:camerabin0/GstWrapperCameraBinSrc:camerasrc/GstAutoVideoSrc:camerasrc-real-src/GstPipeWireSrc:camerasrc-real-src-actual-src-pipewir:\nstreaming
 stopped, reason not-negotiated (-4)")

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https://bugs.launchpad.net/bugs/2058131

Title:
  Snapshot No Camera Found

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