Create base package that does not depend on OpenCV variant

[Breakthrough]

❗Reverted

This needed to be reverted unfortunately - trying to actually depend on scenedetect-core precludes any downstream package from being installed with scenedetect as well. The scenedetect-core releases have been yanked from PyPI and the docs updated.

If you already installed scenedetect-core, please uninstall it and switch to scenedetect (or scenedetect-headless):

pip uninstall scenedetect-core
pip install scenedetect

Existing installs will keep working, but the package will not receive any further updates.

Original Issue

OpenCV ships 4 variants:

• opencv-python
• opencv-contrib-python
• opencv-python-headless
• opencv-contrib-python-headless

None of these can be combined, and right now to simplify things I made scenedetect depend on opencv-python and the -headless variant depend on opencv-python-headless.

We might need to further split out the packages into scenedetect-core so that downstream projects can decide which exact variant they want to include. That way scenedetect itself can continue to depend on opencv-python while other packages (e.g. dvr-scan) can include the contrib variant gracefully.

[Breakthrough]

Done in c1fcb79 for v0.7.1: the repo root now builds scenedetect-core (numpy-only deps, no OpenCV variant, no CLI), with scenedetect / scenedetect-headless built from packaging/variants/ via packaging/build_all.py. Convenience extras scenedetect-core[opencv] and scenedetect-core[opencv-headless] are included. See the 0.7.1 changelog entry for details.

[Breakthrough]

This needs to be reverted unfortunately - trying to actually depend on scenedetect-core precludes any downstream package from being installed with scenedetect as well. Will yank the -core release and update docs ASAP.

If you already installed scenedetect-core, please uninstall it and switch to scenedetect (or scenedetect-headless):

pip uninstall scenedetect-core
pip install scenedetect

Existing installs will keep working, but the package will not receive any further updates.