occipita

Add trusted certificate to allow downloads from motherless (fixes issue #2009)

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# Category This change is exactly one of the following (please change `[ ]` to `[x]`) to indicate which: * [x] a bug fix (Fix #2009) * [ ] a...

Obscure error messages using VideoReader when PyAV version too old/not installed

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### 🐛 Describe the bug When a sufficiently recent version of PyAV is not installed, the script `vision/torchvision/io/video_reader.py` initialises the variable `av` to an `ImportError` object that contains a description...