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Summary:
In preparation for https://github.com/pytorch/audio/pull/3082

Disable those FFmpeg tests that depend on sox CLI. These tests need to be updated or removed so as not to use sox CLI.

Auto-skip some sox tests if decoder/encoder are not available

Pull Request resolved: https://github.com/pytorch/audio/pull/3494

Differential Revision: D47761948

Pulled By: mthrok

fbshipit-source-id: 3a48d7f280f8376a48d223947dd41a7cdc8cbc30