Interactive Content
HD DVDs use Advanced Content to allow interactive content to be authored for discs. Microsoft's implementation of Advanced Content is the HDi Interactive Format, and "HDi" is frequently used to refer to the Advanced Content system. Advanced Content is based on web technologies such as HTML, XML, CSS, SMIL, and ECMAScript (JavaScript), so authoring in Advanced Content should be a fairly easy transition for web developers. No existing DVD authoring experience is required. In comparison Blu-ray Disc content is authored using either a scripting environment (BDMV) or a Java-based platform (BD-J). DVD video discs use pre-rendered MPEG segments, selectable subtitle pictures, and simple programmatic navigation which is considerably more limited.
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