It is a fallback for devices that can't handle modern codecs.
In a world obsessed with pixel density, "602 mp4" represents the minimum viable video experience. It is the format used when data is precious, or when the connection is barely a whisper. 602 mp4
Technical enthusiasts and "archival nerds" track these IDs because they reveal how platforms like YouTube manage billions of files. Format 602 is specifically a container, often delivered via the HLS (m3u8) protocol for iOS and mobile devices. It is a fallback for devices that can't handle modern codecs
Modern AI upscaling is beginning to target these low-quality "nostalgia" videos to bring them into the HD era. Technical enthusiasts and "archival nerds" track these IDs
Tools like yt-dlp frequently interact with these format IDs to help users manage bandwidth or archive video with the smallest possible footprint. Why Format "602" Matters