Filenames starting with "AgAD" are frequently associated with , where media files sent through the app are assigned unique strings before being cached or downloaded. If you found this in a downloads folder, it is highly likely a video shared via a messaging app. Suggestions for MKV files - ExifTool by Phil Harvey
Because the filename itself does not contain descriptive metadata, a "write-up" for this specific file depends on its and the tools available to inspect its contents. Technical Profile: The MKV Container AgADOQgAArdTsFY.mkv
This is the primary software suite for inspecting and editing MKV files . Use the Header Editor to see if the file has an internal "Title" or "Track Name" that differs from the alphanumeric filename. Technical Profile: The MKV Container This is the
This command-line utility can extract technical details such as the Video Frame Rate , Display Aspect Ratio, and any embedded chapter data. Display Aspect Ratio