Season 1, Episode 1, potentially with a specific track or take designation (T02). AAC: The audio codec used (Advanced Audio Coding). .mkv: The original file container (Matroska).
The advanced video codec (High Efficiency Video Coding) used for the source file.
The resolution of the source video (1280 x 720 pixels).
Signals that the source was ripped from a high-definition stream.