Install a working conda installation (see here).
Install PySide6/Qt and FFmpeg together from conda-forge so they use compatible ICU libraries. The Python dependency is PySide6>=6.10,<7, which is satisfied by Conda's package as well as the PyPI distribution.
conda env create -n xb -y -f https://raw.githubusercontent.com/janclemenslab/xarray-behave/refs/heads/master/env/xb.ymlSee demo.ipynb for usage examples.