https://bugs.kde.org/show_bug.cgi?id=505059
Bug ID: 505059
Summary: Webcam image initialised but not updating (moving live
image)
Classification: Applications
Product: kamoso
Version First 25.04.0
Reported In:
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 181929
--> https://bugs.kde.org/attachment.cgi?id=181929&action=edit
Screenshot of Kamoso stuck on initial image from webcam
SUMMARY
Starting Kamoso will show a correct initial image but it is stuck showing that
image and not a live picture from the camera.
STEPS TO REPRODUCE
1. Open Kamoso
OBSERVED RESULT
See attached screenshot of the application showing an initial image.
No live feed or updated image is then shown.
EXPECTED RESULT
Showing a live webcamera image.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 13
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2
Kernel Version: 6.14.8-asahi-1-cy8aer0 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Apple Avalanche (M2), 4 × Apple Blizzard (M2)
Memory: 15.3 GiB of RAM
Graphics Processor 1: Apple M2
Graphics Processor 2: llvmpipe
Product Name: Apple MacBook Air (13-inch, M2, 2022)
U-Boot Version: 2025.04-g1c04616dd38a-dirty
ADDITIONAL INFORMATION
Console output:
kamoso
QSocketNotifier: Can only be used with threads started with QThread
[0:16:33.012835923] [24977] INFO Camera camera_manager.cpp:327 libcamera
v0.4.0
[0:16:33.013266884] [24994] ERROR DmaBufAllocator dma_buf_allocator.cpp:119
Could not open any dma-buf provider
kf.kirigami: Failed to find a Kirigami platform plugin
(kamoso:24977): GStreamer-CRITICAL **: 13:38:20.300:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:20.300:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:20.313:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:21.659:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:23.018:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:24.377:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:25.736:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:27.096:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:28.455:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:28.828:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:29.814:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:31.173:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:32.538:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
Stop
(kamoso:24977): GStreamer-CRITICAL **: 13:38:33.660:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
(kamoso:24977): GStreamer-CRITICAL **: 13:38:33.664:
_gst_util_uint64_scale_int: assertion 'num >= 0' failed
qrc:/qml/Main.qml:134: TypeError: Cannot read property 'recordingTime' of null
Device:
v4l2-ctl --list-devices
apple-isp (no bus info):
/dev/media0
FaceTime HD Camera (platform:22a000000.isp):
/dev/video0
The webcam works fine with gstreamer:
GST_V4L2_USE_LIBV4L2=1 gst-launch-1.0 v4l2src ! xvimagesink
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Redistribute latency...
ERROR: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0: Output
window was closed
Additional debug info:
../sys/xvimage/xvimagesink.c(586): gst_xv_image_sink_handle_xevents ():
/GstPipeline:pipeline0/GstXvImageSink:xvimagesink0
Execution ended after 0:00:05.531599002
Setting pipeline to NULL ...
Freeing pipeline ...
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