The Mega variant is the largest of the four variants of the codec pack. It provides everything that you need to play all your audio and video files. Compared to Full variant it contains some extras such as ACM/VFW codecs that can be used by certain old video encoding applications such as VirtualDub.
This is Package Source K-Lite Codec Pack Mega for Chocolatey.org
To install K-Lite Codec Pack Mega (used chocolatey), run the following command from the command line or from PowerShell:
choco install k-litecodecpackmega