If the text is not "burned in," it is likely embedded metadata. Use your video player's settings (like VLC or a mobile player) to toggle off subtitles or closed captions.
If you are seeing "Ajb (216)" or other technical text your video and want to remove it: Ajb (216) mp4
In historical or academic archives, "AJB 216" has been used to cite specific video segments, such as an introductory clip of the singer Cristina for a 1971 television program in Spain. If the text is not "burned in," it