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1. Null Sound Technique | Flash Tutorials    webdesign.org

We use the same setting as before but set the NULLSOUND length to only 1 loop. This technique is based on one of the interesting features of Flash®: if ANY sound on the timeline is set to STREAM it will switch the player to STREAM mode EVEN if the sound is over. This means that you can use this small NULLSOUND sample to "SWITCH ON" the streaming mode. This mode can be easily switched off with the usage of "Stop All Sound" event on the timeline which stops all of the sounds and switches off the STREAM mode. With this method you can switch on/off the STREAM mode any time during the movie which results in switchable "absolute framerate keeping". The following pictures illustrate this method.