B0444 Starvis/Mediamtx

Raspberry Pi Cameras libcamera
1

I’m successfully using the B0444 running on a raspi zero 2w. my rpi-cam commands work fine and so is python using picamera2.

HOwever, when I try to run mediamtx to stream the camera source to webrtc, I get the following error from the mediamtx server:

[1:14:23.842947151] [3859]  INFO Camera camera_manager.cpp:326 libcamera v0.5.0+59-d83ff0a4-dirty (2025-07-25T10:25:08UTC)
[1:14:23.863102544] [3860]  WARN CameraSensorProperties camera_sensor_properties.cpp:473 No static properties available for 'arducam-pivariety'
[1:14:23.863198586] [3860]  WARN CameraSensorProperties camera_sensor_properties.cpp:475 Please consider updating the camera sensor properties database
[1:14:23.879556318] [3860] ERROR IPAProxy ipa_proxy.cpp:171 Configuration file 'arducam-pivariety.json' not found for IPA module 'rpi/vc4'
[1:14:23.884717159] [3860] ERROR IPARPI ipa_base.cpp:150 Could not create camera helper for arducam-pivariety
[1:14:23.884881066] [3860] ERROR RPI pipeline_base.cpp:814 Failed to load a suitable IPA library
[1:14:23.884960545] [3860] ERROR RPI vc4.cpp:216 Failed to register camera arducam-pivariety 10-000c: -22
2025/09/06 11:24:46 ERR [path cam] [RPI Camera source] camera_create(): selected camera is not available
2025/09/06 11:24:48 INF [WebRTC] [session b18dc543] created by [2603:6081:7343:3d10:bdfe:ea69:398f:6415]:61396
2025/09/06 11:24:48 INF [WebRTC] [session b18dc543] closed: no stream is available on path 'cam'
2025/09/06 11:24:51 INF [WebRTC] [session 13bfa96d] created by [2603:6081:7343:3d10:bdfe:ea69:398f:6415]:61396
2025/09/06 11:24:51 INF [WebRTC] [session 13bfa96d] closed: no stream is available on path 'cam'```

I've also tried to run variations of the mediamtx server using docker including the rpi version but in that case, I get a permission denied error for the /dev files created by the server.  Please advise.  I assume this is because of Arducam's custom libcam?
2

My ultimate goal here is I am trying to stream to a webpage continuously, record on demand, and detect on demand. Getting all that working together is stumping me.

3

Hi,
That’s it.

Did you install the Arducam customer libcamera software on your Pi before?

Otherwise, how does the mediamtx server call the camera? It looks like it’s using the native libcamera software.

4

Calls using rpicam as in raspi docs.

paths:
cam:
source: rpiCamera

I’m trying to get really low latency over network to a browser. But also recording to .h264 locally when a detection event occurs.

5

@dion you’ve been as helpful as you can. But, I’m deciding I’ve spent too much time dealing with non standard libcam issues, updating firmware, and downstream frurstation. I was really hoping to use the lowlight camera for my underwater production application but I can’t seem to get all this working:

  1. using mediamtx to handle h264 streaming from the hardware encoders as I need cpu headroom to do detection and recording locally.

  2. I can successfully use picamera2 to control the camera. But, I can’t get the browser MJPEG stream stable using FASTApi. I can successfully stream using picamera2 mjpeg_server_2.py but its not stable in an ascyncio environment (breaks if multiple browswers hit it or directly hits the stream endpoint).

I can’t seem to solve 2 without 1 so I’m in a box.

Lee