I guess that you installed on Linux with ffmpeg from your package manager. That usually works. It often isn't plug-and-play on Windows or macOS. What I am afraid that "just use uv" can misleading for beginners: uv is great, but it inherits PyPI limits (pypackaging-native.github.io).

Just a curiosity, how can you install ffmpeg (a dependency for example of torchcodec/torchvision) in a cross-platform way without conda or pixi?

There were some design discussions on this in github.com/RobotLocomot...

I love having cappuccino in the afternoon! The only annoying thing is to have to deal with reactions of other Italians.

This is interesting, which bioconda packages use defaults dependencies? As far as I know bioconda stopped using defaults a long time ago, see github.com/bioconda/bio... .

Just migrate 3.13 . Adding free-threading support is a different migration that is currently paused: conda-forge.org/status/migra... . As you can read in github.com/conda-forge/... there are some problems in free-threading in some core python libraries that do not make sense to start that migration.