ATVEF

The Advanced Television Enhancement Forum is a non-profit coalition formed to promote html-based enhanced television standards and deployment. The foundation for ATVEF content is existing web standards.

Triggers to activate content may arrive via text channel 2 of line 21. The content cache can be loaded by broadcast data if available, or upon demand over the Internet. The "TV:" URL is added to reference television channels and may be used anywhere that a URL may reference an image.

Content Level 1.0 requires support for HTML 4.0, CSS 1 , ECMAScript and DOM 0. (However, some receivers claiming ATVEF compliance do not support all features of HTML 4.0) (ECMAScript + DOM 0 = JavaScript 1.1) Receivers are required to provide 1MB for content caching and 1KB for session cookies. Six MIME types must be supported: text/html (HTML 4.0), text/plain, text/css (CSS1 only), image/png, image/jpg (no progressive encoding) and audio/basic.

Possible directions for future content levels include Dynamic HTML, synchronized multimedia, 3-D rendering, tuning, XML, Java, and higher-quality audio among others.

SMPTE is standardizing ATVEF as DDE.

(Related ETVCookBook pages: ATFEF Transport A - ATVEF Transport B - Localize ATVEF)

Advanced Television Enhancement Forum