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I'm trying to have a simple JS app to open the camera and to display it on localhost a webpage.

Opening the camera and setting the resolution works fine with a simple :

navigator.mediaDevices.getUserMedia({ video: { frameRate: { ideal: 30, max: 30 } , width: 4608, height: 2592 } }) .then(stream => { video.srcObject = stream; }) .catch(err => { console.error("Error accessing webcam:", err); });

My issue is that using this code the camera doesn't use autofocus...

So I've been exploring the libcamera options. Code: Select all

libcamera-hello Nicely displays the camera with focus-mode set to continuous.

Opted solution :

Setting up a v4l2 loopback device with :

sudo modprobe v4l2loopback video_nr=123 card_label="VirtualCam" exclusive_caps=1

Then using a GStreamer pipeline using libcamerasrc:

gst-launch-1.0 libcamerasrc af-mode=continuous ! "video/x-raw,format=BGRx,width=4608,height=2592" ! queue ! videoconvert ! v4l2sink device=/dev/video123

With the af-mode=continuous I finally get what I want on my /dev/video123 opened with VLC.

But now I'm unable to see the v4l2loopback interface in Chromium nor Firefox...

So my questions are :

  1. How to default the /dev/video0 to a certain resolution and focus mode ?
  2. How to have Chromium or Firefox detect the V4l2loopback device?

I'm using :

  • Pi 5
  • Latest Bookworm
  • Camera Module 3
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