The file extension stands for Matroska Video . It is a flexible "container" format that can hold multiple video, audio, and subtitle tracks in a single file. Visual & Technical Quality
The filename you provided, somebodiusedtok-720p-webdl-ddp5.1-pl-p2p.mkv , contains a wealth of information about the quality and origins of a digital video file. For those unfamiliar with scene release naming conventions, this "alphabet soup" is actually a precise set of specifications. somebodiusedtok-720p-webdl-ddp5.1-pl-p2p.mkv
To get the best experience from an MKV file with DDP5.1 audio, consider using: The file extension stands for Matroska Video
This tag usually indicates that the content has Polish (Polski) audio or subtitles included. somebodiusedtok-720p-webdl-ddp5.1-pl-p2p.mkv