GitLab

Summary:
Follow-up https://github.com/pytorch/audio/issues/3045
- Revert the removal of HW acceleration doc
- comment out FFmpeg CLI test run

Pull Request resolved: https://github.com/pytorch/audio/pull/3349

Reviewed By: nateanl

Differential Revision: D46121899

Pulled By: mthrok

fbshipit-source-id: dfc030a69f05addec73637cfb6a720c184e37323