: Corrupted metadata in video files (MKV or MP4) often displays this way in media players.

The string you provided, , followed by a series of corrupted characters (often called "mojobake"), typically occurs when text encoded in one format (like UTF-8) is incorrectly displayed in another (like Windows-1252 or Latin-1).

The junk characters following "HD-720p" in your query suggest a file name or a metadata tag that has been damaged during a copy-paste or download. This often happens with: