Op04mp4

Used by fans to share high-quality video files of the intro.

Automated download scripts (like those on GitHub) use these tags to sort episode intros or "Openings." 💡 Op04mp4

is most likely a specific file naming convention or a reference to a specific piece of media, such as a One Piece (OP) opening theme or a promotional clip, rather than a widely recognized industry standard or software. Used by fans to share high-quality video files of the intro