On my system, after loading v4l2loopback, the virtual camera device was created at /dev/video0. However, this device number can vary depending on your system's hardware configuration and which video devices are already present.
Your gst-launch command failed with: ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Device '/dev/video0' is not a output device. This error is crucial. It means that on your system, /dev/video0 is not the virtual camera created by v4l2loopback. Instead, it's likely your actual physical camera (or another input device), which cannot be used as an output sink. To fix this, you need to identify the correct device path for your v4l2loopback virtual camera. Please run : v4l2-ctl --list-devices Look carefully through the output for an entry similar to: Virtual Camera (platform:v4l2loopback-000) , dummy Video Device (0x0000):, or any other device explicitly labeled as a "loopback" or "virtual" device. Once you have identified the correct path for your virtual camera, replace /dev/video0 in the gst-launch-1.0 command with that path. Additionally, If you simply run 'gst-launch-1.0 libcamerasrc ! autovideosink' you should see yourself. -- You received this bug notification because you are a member of Debcrafters packages, which is subscribed to libcamera in Ubuntu. https://bugs.launchpad.net/bugs/2107304 Title: Intel MIPI Camera not working out of the box on 25.04 where it did on 24.10 Status in ffmpeg package in Ubuntu: Opinion Status in ipu6-drivers package in Ubuntu: Confirmed Status in libcamera package in Ubuntu: Confirmed Bug description: From discourse post: https://discourse.ubuntu.com/t/intel-mipi-camera-not-working-out-of-the-box-on-25-04-where-it-did-on-24-10/59072/1 The ipu6 camera on a Dell Precision 5480 worked out-of-the-box on Ubuntu 24.10, but no longer does on 25.04-beta. It was suggested on Discourse that this might be a regression in libcamera. I personally don't understand the v4l/libcamera stack well enough to triage / route. Here's what I'm seeing -- `ffplay /dev/video0` produces a video test image instead of actual video. However, gstreamer is able to show a good video stream via -- $ gst-launch-1.0 libcamerasrc ! video/x-raw,width=1024,height=768 ! autovideosink This is on 25.04 beta with libcamera 0.4 -- $ lsb_release -rd Description: Ubuntu Plucky Puffin (development branch) Release: 25.04 $ apt-cache policy libcamera-v4l2 libcamera-v4l2: Installed: (none) Candidate: 0.4.0-5ubuntu1 Version table: 0.4.0-5ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu plucky/main amd64 Packages The cam util spews several errors + warnings, but does find the camera -- $ cam -l [0:35:00.604727833] [36429] INFO Camera camera_manager.cpp:327 libcamera v0.4.0 [0:35:00.618451974] [36436] WARN CameraSensor camera_sensor_legacy.cpp:354 'ov01a10 3-0036': Recommended V4L2 control 0x009a0922 not supported [0:35:00.618464560] [36436] ERROR V4L2 v4l2_subdevice.cpp:1127 'ov01a10 3-0036': Unable to get rectangle 2 on pad 0/0: Inappropriate ioctl for device [0:35:00.618467885] [36436] WARN CameraSensor camera_sensor_legacy.cpp:401 'ov01a10 3-0036': The PixelArraySize property has been defaulted to 1280x800 [0:35:00.618470480] [36436] ERROR V4L2 v4l2_subdevice.cpp:1127 'ov01a10 3-0036': Unable to get rectangle 1 on pad 0/0: Inappropriate ioctl for device [0:35:00.618472866] [36436] WARN CameraSensor camera_sensor_legacy.cpp:412 'ov01a10 3-0036': The PixelArrayActiveAreas property has been defaulted to (0, 0)/1280x800 [0:35:00.618478424] [36436] ERROR V4L2 v4l2_subdevice.cpp:1127 'ov01a10 3-0036': Unable to get rectangle 0 on pad 0/0: Inappropriate ioctl for device [0:35:00.618480400] [36436] WARN CameraSensor camera_sensor_legacy.cpp:420 'ov01a10 3-0036': Failed to retrieve the sensor crop rectangle [0:35:00.618482222] [36436] WARN CameraSensor camera_sensor_legacy.cpp:426 'ov01a10 3-0036': The sensor kernel driver needs to be fixed [0:35:00.618484025] [36436] WARN CameraSensor camera_sensor_legacy.cpp:428 'ov01a10 3-0036': See Documentation/sensor_driver_requirements.rst in the libcamera sources for more information [0:35:00.618621741] [36436] WARN CameraSensorProperties camera_sensor_properties.cpp:473 No static properties available for 'ov01a10' [0:35:00.618625448] [36436] WARN CameraSensorProperties camera_sensor_properties.cpp:475 Please consider updating the camera sensor properties database [0:35:00.618630274] [36436] WARN CameraSensor camera_sensor_legacy.cpp:594 'ov01a10 3-0036': Failed to retrieve the camera location [0:35:00.618632937] [36436] WARN CameraSensor camera_sensor_legacy.cpp:616 'ov01a10 3-0036': Rotation control not available, default to 0 degrees [0:35:00.619180138] [36436] WARN IPAProxy ipa_proxy.cpp:160 Configuration file 'ov01a10.yaml' not found for IPA module 'simple', falling back to 'uncalibrated.yaml' [0:35:00.619189114] [36436] WARN IPASoft soft_simple.cpp:96 IPASoft: Failed to create camera sensor helper for ov01a10 Available cameras: 1: 'ov01a10' (\_SB_.PC00.LNK1) v4l2-ctl sees many ipu6 video devices. This looks wrong, but I'm not sure what it should look like, and don't have a working system to compare against. $ v4l2-ctl --list-devices ipu6 (): /dev/video1 /dev/video2 /dev/video3 /dev/video4 /dev/video5 /dev/video6 /dev/video7 /dev/video8 /dev/video9 /dev/video10 /dev/video11 /dev/video12 /dev/video13 /dev/video14 /dev/video15 /dev/video16 /dev/video17 /dev/video18 /dev/video19 /dev/video20 /dev/video21 /dev/video22 /dev/video23 /dev/video24 /dev/video25 /dev/video26 /dev/video27 /dev/video28 /dev/video29 /dev/video30 /dev/video31 /dev/video32 ipu6 (PCI:0000:00:05.0): /dev/media0 Virtual Camera (platform:v4l2loopback-000): /dev/video0 dmesg shows the following ipu6 logs -- $ sudo dmesg | grep ipu6 [ 10.600627] intel-ipu6 0000:00:05.0: enabling device (0000 -> 0002) [ 22.119139] pci 0000:00:05.0: deferred probe pending: intel-ipu6: IPU6 bridge init failed [ 22.822604] intel-ipu6 0000:00:05.0: Sending BOOT_LOAD to CSE [ 22.840063] intel-ipu6 0000:00:05.0: Sending AUTHENTICATE_RUN to CSE [ 22.909654] intel-ipu6 0000:00:05.0: CSE authenticate_run done [ 22.909664] intel-ipu6 0000:00:05.0: IPU6-v3[a75d] hardware version 5 ProblemType: Bug DistroRelease: Ubuntu 25.04 Package: libcamera0.4 0.4.0-5ubuntu1 ProcVersionSignature: Ubuntu 6.14.0-15.15-generic 6.14.0 Uname: Linux 6.14.0-15-generic x86_64 ApportVersion: 2.32.0-0ubuntu5 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sun Apr 13 21:06:13 2025 InstallationDate: Installed on 2024-07-25 (263 days ago) InstallationMedia: Ubuntu 22.04.4 v0.7.8 "Custom Jammy Jellyfish" (20240617) ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/usr/bin/zsh TERM=xterm-ghostty XDG_RUNTIME_DIR=<set> SourcePackage: libcamera UpgradeStatus: Upgraded to plucky on 2025-04-11 (3 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ffmpeg/+bug/2107304/+subscriptions -- Mailing list: https://launchpad.net/~debcrafters-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~debcrafters-packages More help : https://help.launchpad.net/ListHelp
