Mp4 — 312

"When designing for social, aim for the 820x312 sweet spot. If your software bumps it to 824, don't panic—it's just 'multiple of 8' math."

Content creators often encounter "312" when trying to export videos for specific social media banners, like Facebook covers (which often use an aspect ratio). 312 mp4

If you are seeing "312" in a technical readout, it likely refers to a within an MP4 container. "When designing for social, aim for the 820x312 sweet spot