Outside of lightsaber customization, "sblade4.mp4" functions as a standard digital container for video and audio data.
High-end lightsabers utilize SD cards to store "blade effects," which are visual animations for the LED strips inside the saber blade.
These files are often managed via mobile applications like the Force Park V2 app, allowing users to upload and preview custom ignition, flicker, and clash effects. The Generic Nature of MP4 Files