If "GM" refers to , there is a specific feature/extension designed for native video playback:
If you are referencing space initiatives, "Luna" may relate to their partnership with Lockheed Martin to develop a next-generation lunar rover . While not a video format, any "mp4" associated with it would likely be mission-critical telemetry or autonomous navigation footage recorded during conceptual testing. GM Luna mp4
If you are looking at a physical device, typical modern "Luna" style MP4 players often include: If "GM" refers to , there is a