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About Expression Encoder

Microsoft Expression Encoder is an advanced application for bringing your edited video project to the web for high-quality playback in Microsoft Silverlight scenarios. Silverlight is a cross-platform technology that supports a true subset of the XML-based XAML (Extensible Application Markup Language). Silverlight enables next generation, rich web client experiences, and delivers a lightweight client that supports vector graphics, 2D animation, rich audio/video integration, and a rich .NET Framework programming model. Silverlight is cross-platform and cross-browser, supporting Windows Vista, Windows XP, and Apple Macintosh OS X 10.4.8, and supporting playback in all versions of Windows Internet Explorer, Mozilla Firefox, and Apple Safari.

For more information about Silverlight technology, see the Silverlight Home page and the Silverlight Community page.

There are two versions of Expression Encoder: Expression Encoder with IIS Smooth Streaming, and Expression Encoder without IIS Smooth Streaming. Expression Encoder with IIS Smooth Streaming is the full version, which contains full access to all the features and codecs necessary for a wide range of streaming and encoding scenarios. Expression Encoder without IIS Smooth Streaming contains nearly all of the features in the full version, minus some codecs and IIS Smooth Streaming. Below is a comprehensive list of the features in Expression Encoder with IIS Smooth Streaming that are not included in Expression Encoder without IIS Smooth Streaming. Any feature discussed in this User Guide that is not included in Expression Encoder without IIS Smooth Streaming will be explicitly noted.

These features are not included in Expression Encoder without IIS Smooth Streaming:

  • Encoding using H.264 codecs.

  • MP4/H.264 decoder.

  • TS (Transport Stream)/MPEG2/AC3 decoder.

  • Smooth Streaming.

  • Unlimited screen capture duration. In Expression Encoder without IIS Smooth Streaming version, you are limited to screen capture durations of 10 minutes.

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