"Amazing XXX.mkv.mp4" appears to be a filename that combines two video container formats (.mkv and .mp4). This often happens when a file has been renamed incorrectly or when a user is attempting to convert a video file.
If this "draft paper" is for a technical comparison, here are the key differences: MKV (Matroska) MP4 (MPEG-4 Part 14) Best for PC/VLC; limited on older TVs/Smartphones. Universal; works on almost all devices and browsers. Audio/Subtitles Amazing XXX.mkv.mp4
If you are having trouble playing the file because of its unusual naming or codec, these tools are highly recommended for their "all-in-one" codec support: "Amazing XXX
: Ensure "File name extensions" are visible in your folder settings (View > Show > File name extensions in Windows) to ensure you are changing the actual extension and not just the name. 2. Converting with FFmpeg Universal; works on almost all devices and browsers
: The industry standard for playing almost any file extension, including malformed ones.