: This is likely a catalog ID from a specific release group or a private tracker database. It’s the "library card number" for this specific version of a film.
What makes a file like this an "interesting feature" isn't the movie itself, but the it represents: 12509-BR720p-SUBS-MEMORY.mp4
: This signifies that subtitles are either "hardcoded" into the video or included as a selectable track, making the content accessible across language barriers. : This is likely a catalog ID from
: This indicates the source is a Blu-ray rip downscaled to 720p resolution. In the mid-2010s, this was the "Goldilocks zone" for internet video—high enough quality to look great on a laptop, but small enough to download quickly on slower connections. : This indicates the source is a Blu-ray
: This naming style created a universal language for the internet. Whether you were in Tokyo or Toronto, you knew exactly what you were getting before you hit "play" just by reading the code.