tatolab-stream

The Python SDK for Tatolab, which turns cameras, microphones, screens, models and your own code into realtime streams that browsers, other streams and AI agents can read.

Looking to get started? Install the Tatolab app first, not this package. tatolab-stream is the library you write streams with. It doesn't run them: the Tatolab runtime on your machine does, and it comes with the app.

• macOS (Apple silicon, macOS 26 or later): brew install --cask tatolab/tap/tatolab, then open -a Tatolab
• Linux (x86_64 with a Vulkan GPU): curl -fsSL https://get.tatolab.com/install.sh | sh

Then follow the Quickstart. tatolab new creates a project that already depends on this package, so you rarely pip install it yourself.

What it is

A stream is an ordinary Python project. You write nodes as Python classes and connect them in a function decorated @stream:

from tatolab.camera import CameraSource
from tatolab.stream import StreamBuilder, stream

from nodes.halftone_lens_effect import HalftoneLensEffect


@stream
def main(stream_builder: StreamBuilder) -> None:
    camera = stream_builder.add(CameraSource)
    effect = stream_builder.add(HalftoneLensEffect)
    stream_builder.connect(camera.output("video"), effect.input("video_from_upstream"))

CameraSource comes from the tatolab-camera module, a dependency the project adds like any other. tatolab dev runs it in the runtime. Each node runs in its own process, so one slow node never blocks another. Tato Studio's viewer shows any node's output on the machine, and the tatolab-moq gateway nodes send one to a MoQ relay, where other streams and machines read it.

This package holds the authoring API (@stream, @node.process, StreamBuilder), typed classes for every built-in node (the converters between the Image, Array, Channels and Records families), and the protocols your nodes are handed at run time. It installs and imports without the runtime, with complete type hints, so your editor, type checker and unit tests work on any machine.

Add it to an existing project

uv add tatolab-stream

The runtime runs your nodes with the project's .venv/bin/python, so anything you install there your nodes can import. See Python SDK for details.

Supports CPython 3.12 to 3.13 (not the free-threaded builds).

Other packages

• tatolab-webrtc: WHIP publish and WHEP play nodes.
• tatolab on PyPI is a placeholder that installs nothing. Tatolab itself installs as an app, as above.

Links

• Documentation
• Install Tatolab
• Write a node
• Python API reference
• Source

Licensed under the Business Source License 1.1.