We currently provide two backends for video-reading: pyav (which is based on PyAV python library) and video_reader (which uses a custom C++ implementation based on ffmpeg).
Due to complexities in the packaging of ffmpeg in the build process at the time of the video_reader release, for now if the user wants the faster video_reader backend they need to compile torchvision from source.

It would be preferable if we could instead make it more seamless to the user, by providing the necessary bits so that they can use the video_reader backend just by installing torchvision via either pip or conda.