B661.mp4 «2027»

If you tell me or what you expect it to contain , I can provide a much more detailed breakdown of its likely contents. MP4 files explained: How to open and use - Adobe

💡 Without the file itself, it is impossible to confirm the visual content. The name suggests it is likely a professional or automated recording related to security hardware or aviation tracking. b661.mp4

Likely utilizes H.264 or HEVC codecs for video and AAC for audio. If you tell me or what you expect