pip install decord returns error on macOS

1. When I used pip install decord, it returned:

ERROR: Could not find a version that satisfies the requirement decord (from versions: none)
ERROR: No matching distribution found for decord

2. When I tried to install from source, I am getting the same error as: https://github.com/dmlc/decord/issues/105 on Mac OS

-- Checking for module 'libavcodec'
-- No package 'libavcodec' found
-- Checking for module 'libavformat'
-- No package 'libavformat' found
-- Checking for module 'libavutil'
-- No package 'libavutil' found
-- Checking for module 'libavdevice'
-- No package 'libavdevice' found
-- Checking for module 'libavfilter'
-- No package 'libavfilter' found
CMake Error at cmake/modules/FFmpeg.cmake:27 (message):
Unable to find FFMPEG automatically, please specify FFMPEG location
Call Stack (most recent call first):
CMakeLists.txt:91 (include)

-- Configuring incomplete, errors occurred!