Since the filename "Video Dec 21, 10 09 54 AM.mp4" follows the default naming convention for or macOS screen recordings, here is how you can identify its "proper features": 1. Technical Metadata (The File's Features)
If you are looking for the technical specifications of this specific file, you can find them by: Video Dec 21, 10 09 54 AM.mp4
If "proper feature" refers to what is happening in the video, the timestamp suggests it may be related to: Since the filename "Video Dec 21, 10 09 54 AM