Turning a Raspberry Pi Camera Into a UVC Webcam or NDI Source for Streaming

The Raspberry Pi Camera Module — especially the HQ Camera and the newer Camera Module 3 — is genuinely good hardware for the price, but it only talks to the Pi's own CSI connector using libcamera, which means it's invisible to Zoom, OBS, Google Meet, or any other application expecting a normal webcam. Two approaches turn a Pi and its camera into something the rest of the world can actually use: exposing it as a standard USB Video Class (UVC) webcam that shows up in any app's camera dropdown, or exposing it as an NDI source for professional video production software that expects network-delivered video streams instead of a plugged-in camera.

Why Not Just Use the Camera Module Directly Over the Network

Our existing Pi Camera Module deep dive covers libcamera, lens selection, and streaming basics, but a raw libcamera network stream (RTSP or MJPEG over HTTP) isn't something Zoom or a video switcher can just select as a camera source — it requires the receiving application to understand that specific streaming protocol, which most consumer video chat and streaming software simply doesn't support. UVC and NDI solve two different halves of this problem: UVC makes the Pi camera look like a literal USB webcam plugged into whatever computer it's connected to, while NDI makes it a discoverable network video source for software that's built around NDI (OBS, vMix, most modern live production tools).

Option 1: UVC Gadget Mode (Pi as a Plug-and-Play USB Webcam)

This approach uses the Pi's USB port in device (gadget) mode rather than host mode, so instead of the Pi acting as a computer with USB peripherals attached, it presents itself to whatever it's plugged into as a USB peripheral — specifically, a UVC-class webcam. This requires a Pi model with USB OTG/gadget mode support (Pi Zero W/2 W, or a Pi 4/5 using its USB-C port in the right mode) and the `uvc-gadget` software stack, which bridges the Pi's own libcamera-captured frames into the UVC gadget driver's video buffer.

• Enable `dwc2` USB gadget mode in `/boot/config.txt` (`dtoverlay=dwc2`) and load the `libcomposite` and `uvcvideo` kernel modules
• Install and configure `uvc-gadget` (the open-source project, not to be confused with the kernel module of the same name) to define a UVC function with your desired resolution and frame rate
• Write a small capture bridge script that pulls frames from libcamera (via `libcamera-vid` piped into the gadget's video buffer, or using the Python `picamera2` library directly) and feeds them to the UVC gadget interface
• Connect the Pi to your computer via its USB (not power-only) port; it should appear in Device Manager / System Information as a UVC video device, and in any app's camera list as a normal webcam

The result behaves exactly like a USB webcam plugged in normally — no drivers to install on the host computer, no network configuration, and it works in literally any application that can select a webcam, because from the host's point of view it is one.

Option 2: NDI Source (Network Video for Production Software)

NDI (Network Device Interface) is a protocol built for live video production — low-latency video and audio over a normal Ethernet/WiFi network, with automatic discovery so a video switcher or OBS scene can pick "Pi-Camera-1" from a dropdown the same way it would pick a local webcam. Getting a Pi camera onto NDI means running an NDI-capable encoder application on the Pi itself; the two common approaches are building `libndi` support into a custom capture pipeline, or using a pre-built tool like `libcamera-vid` piped through `ffmpeg` with an NDI output module compiled in. This is more CPU-intensive than UVC gadget mode (the Pi has to encode and push a full network video stream rather than just relaying raw frames over USB), so a Pi 4 or 5 is strongly preferred over a Pi Zero for anything beyond 720p.

ApproachConnectionBest Pi ModelCompatible WithSetup Complexity UVC Gadget ModeUSB cablePi Zero W/2 W, Pi 4/5 (USB-C OTG)Any app that accepts a webcam (Zoom, Meet, OBS, browser)Moderate — kernel module config NDI SourceNetwork (Ethernet/WiFi)Pi 4 or 5 (CPU headroom for encoding)OBS, vMix, and other NDI-aware production toolsHigher — NDI SDK/build setup

Choosing Between Them

If your goal is a Pi camera that acts as a normal webcam for a single computer — a dedicated overhead document cam, a fixed angle for streaming, a low-cost webcam replacement for an old laptop with no working camera — UVC gadget mode is the simpler, more universally compatible choice, since literally every video app already knows what to do with a USB webcam. If you're running a multi-camera production setup with OBS or a hardware/software video switcher and want to add a Pi camera as one more selectable source alongside other NDI feeds, without a physical cable back to the machine running the encoder, NDI is the right tool even though it takes more setup effort and more Pi horsepower.

Latency and Bandwidth Notes

UVC gadget mode has effectively the same latency as a real USB webcam — a frame or two — because it's a direct USB video pipe with no network hop or extra encode/decode round trip. NDI, being a compressed network video protocol, adds meaningful latency (typically tens to a couple hundred milliseconds depending on resolution and network conditions) and uses real bandwidth on your local network (NDI's high-bandwidth mode can use over 100Mbps per 1080p stream, though NDI HX/NDI|HX3 lower-bandwidth modes trade some latency and quality for far less network load). For anything latency-sensitive — live switching where sync with other cameras matters — test your specific NDI mode and network before committing to it for a live event.

Either path turns hardware that's otherwise stuck talking only to the Pi's own applications into something the rest of your video tools can actually use, and the choice mostly comes down to whether you need a literal plug-in webcam or a network-discoverable production source.