When you hear the term it refers to making MP4 video files compliant with Section 508 of the Rehabilitation Act . In short, it’s about ensuring that your digital video content is accessible to everyone, including people with visual, auditory, or physical disabilities.
An MP4 is only as accessible as the "container" it sits in. The player used to watch the video must: Be operable via (no mouse needed).
I can suggest software for creating .SRT files or accessible web players!
Section 508 requires federal agencies to make their electronic and information technology accessible. While it technically applies to government entities, it has become the gold standard for web accessibility (often aligning with standards). For MP4 videos, this means the content cannot just be "seen" and "heard"—it must be "perceived" in multiple ways. The 4 Pillars of a 508-Compliant MP4
Captions are the most common requirement. Unlike "open" captions (which are burned into the video), can be turned on or off by the viewer.
Convert that transcript into a time-coded file (like a .VTT ).