Mmv.2019.1080p.aac2.0.h.264

: The audio codec and channel configuration. AAC (Advanced Audio Coding) is the compression standard, and 2.0 indicates two-channel stereo sound.

: The video resolution, indicating "Full HD" (1920 x 1080 pixels) with progressive scanning. MMV.2019.1080p.AAC2.0.H.264

: The video compression standard (also known as AVC), which is widely used for high-quality video playback on most devices. : The audio codec and channel configuration

Each part of the name provides technical specifications about the video quality and encoding: MMV.2019.1080p.AAC2.0.H.264