`CameraServer` on Linux in 4.5-beta1 fails to detect cameras.

[madebydavid]

Tested versions

• Reproducable in: v4.5.beta1.official.46c495ca2
• Works in: 4.4.1.stable.official.49a5bc7b6

System information

Godot v4.5.beta1 - Ubuntu 22.04.2 LTS 22.04 on X11 - X11 display driver, Multi-window, 1 monitor - Vulkan (Mobile) - integrated AMD Unknown (RADV REMBRANDT) - AMD Ryzen 7 PRO 6850U with Radeon Graphics (16 threads) - 27.17 GiB memory

Issue description

I have a small test script which just loops the CameraServer.feeds() and prints the name.

extends Camera2D

var camera_name = "USB 2.0 Camera"
var camera: CameraFeed

func _ready():
	CameraServer.monitoring_feeds = true
	for feed in CameraServer.feeds():
		name = feed.get_name()
		print(name)
		if camera == null and name == camera_name:
			camera = feed

	if camera == null:
		print("no camera found")
		return

On the latest beta version (4.5-beta1) on Linux, it doesn't detect any feeds.

This same code works in 4.4.1 on Linux

Steps to reproduce

I have included an MRP which shows this issue.

Minimal reproduction project (MRP)

2025-06-30-camera-server-issue.zip

[AThousandShips]

Does it work when enabling monitoring as per the error message?

Monitoring was turned of by design in:

• Deactivate the CameraServer by default. #104232

This should be documented in the migration guide and in the classes themselves

[madebydavid]

Does it work when enabling monitoring as per the error message?

If I set CameraServer.monitoring_feeds = true first then the error is not shown, but no cameras names are printed. The same code on 4.4.1 prints the name the integrated camera.

[AThousandShips]

Make sure to update your example with the correct procedure to test this

[shiena]

I also tested it in the following environment and the camera worked.

• WSL2 + usbipd-win
• HD Pro Webcam C920
• Godot v4.5.beta1 - Ubuntu 24.04.2 LTS 24.04 - X11 display driver, Multi-window, 2 monitors - OpenGL 3 (Compatibility) - D3D12 (AMD Radeon(TM) Graphics) - AMD Ryzen 9 9900X 12-Core Processor (24 threads) - 30.19 GiB memory
• root privileges

Please try my demo project.
https://github.com/shiena/godot-camerafeed-demo

[shiena]

I was able to acquire the camera device by adding a Sprite2D to the MRP scene and setting CameraTexture to the Sprite2D's Texture. It's likely that something is being initialized by CameraTexture.

[madebydavid]

@shiena - your demo project works well for me on v4.5.beta1.official.46c495ca2 even without root priviledges, but my minimal demo does not work in the same conditions. I will try to find a difference.

[shiena]

@madebydavid
There was a simpler method than CameraTexture. After CameraServer.monitoring_feeds = true, wait for 1 frame with await get_tree().process_frame. This should allow you to acquire the camera device.