pyav
12.0.3
This version was deleted from PyPI around 2024-05-08. Installing fails with:
$ pip3 install pyav==12.0.3
ERROR: Could not find a version that satisfies the requirement pyav==12.0.3

Install through StableBuild
You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
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Or, download files manually
And install manually via pip:
pyav-12.0.3-cp39-cp39-win_amd64.whl
(18.4MB)
pyav-12.0.3.tar.gz
(3.6MB)