ActiveFrame Rewrites Browser Video Playback

This is a pragmatic hack around a real browser limitation: if you need deterministic frame access, HTML5 video is often the wrong abstraction. ActiveFrame trades compatibility and simplicity for precise control, which makes sense for scrubbing-heavy and image-like video UIs.

• –The format is intentionally narrow: it targets exact frame navigation, predictable loading, and hardware-accelerated decode rather than general-purpose playback.
• –Packing samples into a manifest-driven `.af` container avoids the timing drift and seek ambiguity that show up in standard browser video pipelines.
• –The main cost is ecosystem friction: custom authoring, custom playback code, and a smaller interoperability surface than normal video tags or streaming formats.
• –The repo positions this more as a tooling primitive than a consumer media player, so the strongest fit is interactive editing, motion design, or synchronized frame inspection.