The Matroska Multimedia Container (.mkv) is an open-source, flexible file format that acts like a "nesting doll" (a nod to the Russian word Matryoshka ). Unlike a simple video codec, it is a that can bundle an unlimited number of video, audio, picture, and subtitle tracks into a single file. Key Features and Benefits
While the specific long alphanumeric string appears to be a unique identifier for a video file or link, it refers to a file in the format. What is an MKV File? The Matroska Multimedia Container (