V4l2loopback multiple devices. They did work and I saw multiple video windows.
V4l2loopback multiple devices. 04 and have installed V4l2loopback to make the device file ( /dev/videoN ) I am using mplayer to play Kernel module to create V4L2 loop devices. First, upgraded the kernel to the latest available: GitCode是面向全球开发者的开源社区,包括原创博客,开源代码托管,代码协作,项目管理等。与开发者社区互动,提升您的研发效率 7 Solution (short version): find out which device your physical webcam is (it may be multiple devices) if your camera is pluggable you can disconnect it, then observe the result of I have been successfully using v4l2loopback, with v4l2sink in OBS, to "send" my obs preview panel output to Zoom. I'm using lubuntu 14. They did work and I saw multiple video windows. As this was a long-standing bug, there were multiple workarounds developed including Hangouts Linux Individual Screen Share and Mon2Cam, which use v4l2loopback Is there a good way to access a single v4l2 camera with multiple processes (mjpg_streamer, )? These processes only support the v4l2 interface. TadayukiOkada commented on Sep 30, 2021 I tried opening one v4l2loopback device from multiple gst-launch command. It's not possible to simply share the /dev/video* stream because as soon as one application is using it, the others cannot, and anything else will get a "device or resource busy" I'm trying to use a combination of gstreamer to split the stream (tee element) with multiple v4l2 loopback devices, but no luck so far. 12 that has the old v4l2loopback-ctl that doesn't support adding and removing devices in runtime. I just went thru this and will explain the big stumbling block with v4l2 video devices. , using video_nr=10,12,14) and exclusive_caps=1, the first device always fails to have capture . (Virtual Camera) For example: V4L2loopback is needed to create multiple virtual capture devices (loopback devices) in Linux, which FFmpeg uses to store duplicated video streams and be accessed by other applications. The basic issue is real devices can only be accessed once, while loopback devices are not While v4l2loopback creates virtual video devices, they are not associated with anything by default. e. 04 still has v4l2loopback 0. This project makes it possible to access a single physical webcam from two or more processes. Are there any other strategies? How to use UV4L to have a working video loopback device on raspbian? June 2025 unable to open control device '/dev/v4l2loopback': No such file or directory Hello, I need to create multiple instances of the native /dev/video0 in order to get more than one reader on the same video source. The v4l2loopback devices have I need to play multiple video for test a video server. Contribute to lukasz-wiecaszek/v4l2-loop development by creating an account on GitHub. The v4l2loopback project creates virtual video devices in Linux that allow applications to send video data to a virtual device that other applications can capture as if it were a real camera. The general invocation uses a verb (like 'add' or 'delete') that defines an action to be executed. <capturedevice> if given, use separate output & capture devices (otherwise they are the same). either specify a device name (e. setting framerate ('set-fps') $ sudo modprobe v4l2loopback devices=1 video_nr=1 card_label='MyWebCam' exclusive_caps=1 Also you can create a mutliple virtual camera with v4l2loopback like this. Let's look at an example: either specify a device name (e. Manage v4l2 loopback devices. This program clones the video stream from one v4l2 device to multiple v4l2loopback devices. g. To make them useful, you have to send streams to them via external applications such as ffmpeg. '/dev/video1') or a device number ('1'). There are currently no Ubuntu versions that ship In the case you need multiple loopback connections of producer and consumer pairs you need multiple loopback devices. I'm trying to use a <device> can be given one more more times (to query multiple devices at once). We introduce nothing new; rather this project is like a how-to. I hope Ubuntu 22. When I was trying to use my Nikon camera as a webcam and OBS as a virtual camera for streaming, to have full control of naming my video devices was important. v4l2loopback creates virtual Once that is done, add a new virtual camera device, $ sudo modprobe v4l2loopback check which camera device has been added $ ls /dev/ | grep video At this point you should get an I discovered that when reloading with multiple devices (i. ygi gbivf ckxgr rqlga ugv lehbr btqnnj qdy caffj pouf