This is a Matroska Video container. It is a popular open-source format that can bundle an unlimited number of video, audio, and subtitle tracks into a single file.
MKV is the "nesting doll" of video formats (named after the Russian Matroska dolls). It is widely used for high-definition movies because it can hold multiple language tracks and subtitle files that you can toggle on or off. AgADuwcAAkEqWVY.mkv
Unlike MP4 files, which can become corrupted if a recording is interrupted (like a computer crash), MKV files are designed to preserve the video even if the process stops abruptly. This is a Matroska Video container
In Telegram's API, strings starting with "AgAD" are often part of a file_id or file_unique_id . These are used by the platform to identify specific pieces of media across its servers. It is widely used for high-definition movies because
The identifier appears to be a specific file name typically generated by Telegram's internal servers when a video is uploaded or shared.
Because this is a unique system-generated ID, there is no public "write-up" or general documentation for this specific file. However,
Since this is a system-assigned name, the actual video content could be anything—a movie clip, a personal recording, or a meme shared in a group. About MKV Files