Content creators often encounter "312" when trying to export videos for specific social media banners, like Facebook covers (which often use an aspect ratio).
If you are seeing "312" in a technical readout, it likely refers to a within an MP4 container. 312 mp4
"Ever wondered why your 820x312 banner keeps getting stretched, or why your 'small' video export is suddenly massive?" Body: Content creators often encounter "312" when trying to
"If you're tackling the CSE 312 MP4 upload challenge, remember that handling binary data is all about the right headers." 312 mp4