Most AR platforms recommend avoiding full-frame pure black at the start to prevent "blank" triggers. How to Manage the File
If it is a standard MP4, it should open in VLC, Windows Media Player, or QuickTime. AR 00103b mp4
Based on technical standards for files with these identifiers, Likely Contexts Most AR platforms recommend avoiding full-frame pure black
The "AR" prefix often refers to Advanced Recording Format (.arf) used by Cisco Webex. Since yours is an MP4 , it has likely already been converted from its original meeting format to be playable on standard devices. it should open in VLC