High-volume video datasets (like WebVid or Kinetic-400) often use such identifiers to categorize clips.
Injecting Telemetry into Video Files (Part 3): Structuring ... - Trek View g4_01154.mp4
If you are looking for a write-up on the file's structure or technical properties, an MP4 (MPEG-4 Part 14) container typically includes: g4_01154.mp4