V4l2loopback device not opening in chrome or firefox

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hi all,

I am having an issue with v4l2loopback. I have multiple csi cameras. Browsers are not able to see CSI Cameras. So, I am writing those csi camera’s output into an virtual devices using ROS Virtual Cam package.

here is the command to create a virtual devices
sudo modprobe v4l2loopback devices=2 video_nr=10,11 card_label=“csi1 output”,“csi 2 output” exclusive_caps=1

here is the command I am using to get the csi camera output and wriiting into a virtual device.
rosrun virtual_cam stream _device:=/dev/video10 _width:=640 _height:=480 _fourcc:=YV12 image:=/my_camera/csi_camera_1

When I open the virtual device using opencv, I am able to see the csi Camera’s feed. But in firefox or chrome, it is able to detect the labels like( csi 1output and csi 2 output) but camera feed is blank. In the console it is showing an error like this,

getUserMedia: Requested Device Not Found".

So, I tried to record the screen using ffmpeg and writing into a virtual device (csi 1 output) and able to see it in chrome. I stopped ffmpeg and run the rosrun (above command to write csi cameras into a virtual device) then it is working.

It is so, inconsistent. Please help me if you have any ideas about this.

3

hello udaysaikrishna,

according to Camera Architecture Stack, that’s v4l2src to communicate with USB camera directly;
other bayer sensor types, (i.e. CSI camera sensor). it only support with the path going through [Camera Core] block to handle demosaic and other image process.

you may convert the pixel formats as chrome or firefox support types,
please also check Topic 164994 as see-also,
thanks