: Use a tool like MediaInfo to see the technical details (encoding date, software used) which might hint at its origin.
: Files with these alphanumeric names are usually cached media or direct downloads from a private chat, group, or channel. How to identify the content AgADHwgAArdTsFY.mkv
: The .mkv extension indicates it is a Matroska Video file, a high-quality container that can hold video, multiple audio tracks, and subtitles. : Use a tool like MediaInfo to see
Since the filename itself doesn't describe the video, you can try the following to figure out what it is: multiple audio tracks