From: daniel@me.invalid   
      
   On 14/11/2025 01:24, The Natural Philosopher wrote:   
   > I wonder if cheese exists for RPi - that was always my default webcam   
   > tester/ Looks like it does   
      
   Yes, cheese is just an "apt install" away.   
      
   I had a spare moment and a spare webcam and a Pi 3b that wasn't doing   
   anything so I plugged the webcam into the Pi and installed cheese ...   
      
   ... the camera was recognized straight away, but I did not get a   
   picture. cheese displayed "There was an error playing video from the   
   webcam".   
      
   So I tried the camera on my big AMD64 box (which already has the same   
   model of webcam installed) and cheese recognized both and let me switch   
   between them and display an image from either.   
      
   So I went back to the Pi. I tried changing resolutions with no joy. I   
   tried changing source to one of the (non-existent) Pi camera sources and   
   back. No joy.   
      
   I tried running cheese in a terminal and got:   
      
   -----   
   $ cheese   
      
   (cheese:1798): Cogl-WARNING **: 11:05:55.858:   
   driver/gl/gl/cogl-texture-driver-gl.c:453: GL error (1281): Invalid value   
      
      
   (cheese:1798): Cogl-WARNING **: 11:05:55.858:   
   driver/gl/gl/cogl-texture-driver-gl.c:457: GL error (1281): Invalid value   
      
      
   (org.gnome.Cheese:1798): cheese-CRITICAL **: 11:05:56.658: GValue type   
   gint x GstValueList, cannot be handled for resolution   
      
   (org.gnome.Cheese:1798): cheese-CRITICAL **: 11:05:56.659: GValue type   
   gint x GstValueList, cannot be handled for resolution   
      
   (org.gnome.Cheese:1798): cheese-WARNING **: 11:05:58.128: Internal data   
   stream error.: ../libs/gst/base/gstbasesrc.c(3187): gst_base_src_loop   
   ():   
   /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/Gst   
   in:bin28/GstV4l2Src:v4l2src1:   
   streaming stopped, reason not-negotiated (-4)   
   -----   
      
   None of which meant anything much to me.   
      
   I then tried vlc (again, in the terminal). Opened a capture device,   
   (mode Video camera, device name /dev/video0) and got a VERY slow video   
   of myself. I should think the frame rate was about 4fps ... but the   
   camera was definitely working.   
      
   vlc produced one message in the terminal window that looks interesting:   
      
   [0000007f70028fb0] main decoder error: buffer deadlock prevented   
      
   The camera is one I bought from the Raspberry Pi store in Cambridge for   
   about £25 three or four years ago. It is an "A4TECH PK-910H 1080P   
   Full-HD WebCam". The one on my AMD64 box came from Pi Hut (during Covid,   
   when you couldn't get webcams from the usual suspects even for silly   
   money), they have it online for £32 today.   
      
   Why it doesn't work with cheese on the Pi I can't say, though maybe the   
   buffer deadlock message from vlc contains a clue that cheese isn't doing   
   something necessary that vlc is?   
      
   --   
   Cheers,   
     Daniel.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)