/dev/video0 is working in VM Desktop UI, but not in docker

[sai045]

Problem Summary:

I am running a setup involving a virtual camera using /dev/video0 in a VM accessed via Chrome Remote Desktop. Here's a breakdown of the scenario:

1. Virtual Camera Setup on Host:

   • I run the following command to stream a video file to /dev/video0 on the host:

     sudo ffmpeg -re -i videoplayback.mp4 -f v4l2 -vcodec rawvideo -pix_fmt yuv420p /dev/video0

   • This works as expected. /dev/video0 is recognized and used properly in a Google Meet session in Chrome running on the VM's desktop.

2. Docker Setup:

   • In a Docker container, I set up the virtual camera as follows:

     sudo usermod -a -G video root
     sudo modprobe -r v4l2loopback
     sudo modprobe v4l2loopback exclusive_caps=1 card_label="Virtual Camera" max_buffers=2 video_nr=0
     ffmpeg -re -i /app/videoplayback.mp4 -f v4l2 -vcodec rawvideo -pix_fmt yuv420p /dev/video0 &

   • The ffmpeg command runs as expected in the container.

3. Issue:

   • While /dev/video0 is accessible and functional from the VM's desktop environment (e.g., in Google Meet), it is not recognized in Google Meet when accessed through the Docker container.

4. Docker Initialization Details:
   The Docker container is started with the following configurations:

   container = client.containers.run(
       "trident.azurecr.io/go-x-bot-service:new-6",
       name=container_name,
       environment={
           **environment,
           'DISPLAY': ':0',  # Ensure X11 display is set
       },
       detach=True,
       volumes={
           '/home/tensorgo/devops/Gox_tmp_video': {'bind': '/home/tensorgo/devops/Gox_tmp_video', 'mode': 'rw'},
           '/tmp/.X11-unix': {'bind': '/tmp/.X11-unix', 'mode': 'rw'},
           '/dev': {'bind': '/dev', 'mode': 'rw'}  # Add access to device files
       },
       devices=[
           '/dev/video0',
       ],
       privileged=True,  # Add privileged mode for kernel module operations
       ipc_mode='host',
       shm_size='2g',
       cap_add=['SYS_ADMIN'],  # Add additional capabilities for device management
       security_opt=['seccomp=unconfined']  # Disable seccomp restrictions for device access
   )

5. Observation:

   • /dev/video0 is accessible and functional in the VM's desktop environment via Chrome Remote Desktop.
   • However, /dev/video0 is not recognized or functional in the Docker container when attempting to use it in a Google Meet session.

Request:
What could be causing /dev/video0 to work in the VM's UI but not in the Docker container? How can I resolve this issue to make /dev/video0 functional in the container as well?