This feature enables you to get a thumbnail snapshot of a given video, including sound, for display purposes.

Flash Player clients are permitted to access data from streams in the directories specified by the Client.audioSampleAccess and Client.videoSampleAccess properties. See the ActionScript 3.0 Language and Components Reference.

To access data, call BitmapData.draw() and SoundMixer.computeSpectrum() on the client--see "Accessing raw sound data" in Programming ActionScript 3.0.