Open source

Built on open source

FirstPass includes these open-source components, each under its own license. The full list, with every license text, is in THIRD_PARTY_NOTICES.txt in the FirstPass install folder.

FFmpeg · GNU LGPL v3+

Bundled as ffmpeg.exe / ffprobe.exe (the unmodified LGPL build from FFmpeg-Builds), run as separate programs. The exact source code is published with each FirstPass release, or email us for a copy.

PyAV (with FFmpeg libraries) · BSD-3-Clause; FFmpeg libraries LGPL v3+

github.com/PyAV-Org/PyAV

Python · PSF License v2

python.org

faster-whisper & CTranslate2 · MIT

Speech transcription, with OpenAI's Whisper “base” model (MIT).

OpenCV · Apache 2.0

Frame analysis (shake, blur, scene changes).

NumPy, SciPy, Pillow, ImageHash, PyWavelets · BSD / HPND-style

Math, audio and image processing.

ONNX Runtime, tokenizers, Hugging Face Hub · MIT / Apache 2.0

Used by the transcription stack.

cryptography · Apache 2.0 / BSD

Verifies your account's signed license.

Tcl/Tk · BSD-style

The app's window toolkit.

flag-icons · MIT

Country flags on the leaderboard and profiles.