Don't build video decoder homemade backend by default #9208
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This PR avoids building the C++ video decoder by default and remove the installation of
ffmpeg
when we build a wheel.As a result, the "homemade C++" backend of torchvision is removed from official releases. Some of the video decoding interface is still available, but only through an optional dependency on
pyav
. Eventually we'll want to remove everything, but this PR is an intermediate step that: