VTKStreaming

This module provides classes to encode and stream frames from a VTK OpenGL render window using video codecs. It supports video encoding with VP9 (through libvpx) and H.264/H.265 through hardware encoders: NVENC on NVIDIA GPUs, and VideoToolbox on macOS (Apple Silicon and Intel).

Installation

VTKStreaming is available on PyPi on the following platforms:

Linux x86_64 for python 3.10 to 3.13 included.
Windows x86_64 for python 3.10 to 3.13 included.
MacOSX arm64 for python 3.10 to 3.13 included.

It is currently based on VTK 9.6.0.

pip install vtk-streaming

Building from source

There are two build flows:

Development build: an editable install into a local virtual environment, built without build isolation. Rebuilds are fast and the generated compile_commands.json stays valid, so clangd/IDE tooling works.
Release build: cibuildwheel produces the exact same distributable wheel as CI, in an isolated environment.

Requirements (both flows):

Linux: A C++ compiler (GCC 11.4+ or any other compiler supported by VTK.)
Windows: MSVC (Visual Studio Build Tools). (ensure visual studio environment is initialized)
macOS: Xcode command line tools. (xcode-select --install should have completed successfully)

We recommend uv; it reads the vtk-sdk package index from pyproject.toml, so no extra index flags are needed.

Development build

The editable install runs with --no-build-isolation, so the build requirements (scikit-build-core, vtk-sdk, vtk-sdk-python-wheel-helper) must be present in the environment first, the dev dependency group installs them along with the test dependencies.

Linux/macOS:

uv venv -p 3.13
. .venv/bin/activate
uv pip install --group dev
uv pip install -e . --no-build-isolation

Windows (open a PowerShell with MSVC initialized, e.g. Visual Studio Developer PowerShell):

uv venv -p 3.13
.venv\Scripts\Activate.ps1
uv pip install --group dev
uv pip install -e . --no-build-isolation

After changing C++ sources, rebuild by re-running the editable install:

uv pip install -e . --no-build-isolation

The CMake build tree persists under build/<wheel_tag>/, which keeps generated module headers on disk and compile_commands.json valid.

Run the tests with:

pytest tests/ -v

Release build (reproduce CI artifacts)

Wheels are built with cibuildwheel in an isolated environment; all configuration lives in [tool.cibuildwheel] in pyproject.toml.

Requirements:

Linux: Docker (the build runs in a manylinux container).
Windows: MSVC (Visual Studio Build Tools). (ensure visual studio environment is initialized)
macOS: Xcode command line tools. (xcode-select --install should have completed successfully)

Build a wheel for one Python/platform target:

# Linux
uvx cibuildwheel --only cp310-manylinux_x86_64

# Windows
uvx cibuildwheel --only cp310-win_amd64

# macOS
uvx cibuildwheel --only cp310-macosx_arm64

uvx comes with uv; alternatively pipx run cibuildwheel or if you use pip:

pip install cibuildwheel

# Linux
cibuildwheel --only cp310-manylinux_x86_64

# Windows
cibuildwheel --only cp310-win_amd64

# macOS
cibuildwheel --only cp310-macosx_arm64

Substitute cp310/cp311/cp312/cp313 to target other Python versions. The wheel is written to wheelhouse/ and can be installed directly:

pip install wheelhouse/vtk_streaming-*.whl

Examples

examples/simple_encoder_decoder.py - Live VP9 encode/decode round-trip with two render windows side by side.
examples/resize_encoder_decoder.py - VP9 encode/decode round-trip that survives window resizes.
examples/simple_hardware_encoder_record.py - Record a render window for later playback using whichever hardware H.264 encoder vtkEncoderFactory selects (Apple VideoToolbox on macOS, NVENC on NVIDIA GPUs). This needs ffplay to playback the .h264 file.

Getting help

For issues with the API, usage or bugs in VTKStreaming libraries, please report them on the original repository.
For issues with wheel installation, supported Python and VTK versions or Python-side issues, please report them on the GitHub Fork.

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distributions

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0.4.0

Jul 11, 2026

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Jul 3, 2026

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Jul 3, 2026

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Jul 2, 2026

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Jun 12, 2026

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May 22, 2026

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Apr 28, 2026

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Apr 28, 2026

0.2.0

Apr 27, 2026

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Apr 27, 2026

vtk-streaming 0.4.0

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