Public bug reported:

Running snapshot, I get a UI error message "could not play camera
stream", a black window, and the following log messages:

2024-04-12T16:32:17.738325Z  INFO snapshot::application::imp: Snapshot 
(org.gnome.Snapshot)    
2024-04-12T16:32:17.738340Z  INFO snapshot::application::imp: Version: 46.0    
2024-04-12T16:32:17.738346Z  INFO snapshot::application::imp: Datadir: 
/usr/share/snapshot    

(snapshot:923479): Adwaita-WARNING **: 09:32:17.773: Using 
GtkSettings:gtk-application-prefer-dark-theme with libadwaita is unsupported. 
Please use AdwStyleManager:color-scheme instead.
2024-04-12T16:32:18.266073Z ERROR aperture::viewfinder: Could not start 
camerabin: Element failed to change its state    
2024-04-12T16:32:18.270673Z ERROR aperture::viewfinder: Could not start 
camerabin: Element failed to change its state    
2024-04-12T16:32:18.272590Z 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")
    
2024-04-12T16:32:18.272628Z 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)")    


Running the flatpak org.gnome.Snapshot version of the app, everything
works ok, fwiw

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gnome-snapshot 46.0-1ubuntu2
ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
Uname: Linux 6.8.0-11-generic x86_64
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: GNOME
Date: Fri Apr 12 09:31:36 2024
InstallationDate: Installed on 2019-08-17 (1701 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190305.1)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: gnome-snapshot
UpgradeStatus: Upgraded to noble on 2024-03-23 (20 days ago)

** Affects: gnome-snapshot (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble wayland-session

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https://bugs.launchpad.net/bugs/2061165

Title:
  Could not play camera stream

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