Microsoft UI Automation is a framework in Windows that provides information to assistive technologies. Accessibility features related to video that can be tied into Silverlight through the UI Automation include captioning, tab sequences and high contrast themes.
Captioned videos for Silverlight can be produced through the Expression Encoder, either as a limited free download a fully featured ‘Pro’ version. The Microsoft Silverlight interface can support a variety of video formats and containers for captioned video. The table below shows which formats are supported.
|Delivery Method||Supported Containers|
|Progressive download||Windows Media, MP4, MP3, ASX|
|Windows Media Streaming over HTTP||Windows Media, Server Side Play List (SSPL)|
|Smooth Streaming (specific type of MediaStreamSource)||fMP4|
|ASX||Windows Media, MP4, ASX|
|Server Side Playlist||Windows Media|
|MediaStreamSource||MediaStreamSourcegives the developer complete control over the container. Any container can be used as long as the developer writes or uses a parser for it.|
|MP4||H.264 (ITU-T H.264 / ISO MPEG-4 AVC), AAC-LC|
|MP3||"85" - ISO MPEG-1 Layer III (MP3)|
Top of page