MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Spezifikationen PDF herunterladen (Seite 161)

Application Development Tips and Tricks 83

Stream object

If you want to delete the FLV and IDX files associated with a recorded stream, you must use

server-side code:

s = Stream.get("foo");

if (s)

{

s.clear();

}

Microphone object

This section includes recommendations to help you optimize your use of the Microphone object,

including tips on avoiding audio feedback.

Avoiding audio feedback

If you’re using a microphone with external speakers and a reasonably high gain, you’re likely to

incur audio feedback problems. To reduce feedback from speakers, Flash Communication Server

implements echo suppression. To use echo suppression, use the following command:

myMicrophone.useEchoSuppression(true);

This should maintain a comfortable input level without transmitting too much echo from your

speakers.

Because echo suppression removes only a portion of the output signal from the user’s input, you

might still experience feedback if your microphone is too close to your speaker. To avoid

feedback, try following these guidelines:

• Lower your speaker volume.

• Move the microphone and speakers farther apart.

• Troubleshoot your hardware setup for proper installation and settings.

• Use a headset.

Keeping the microphone open

To save bandwidth, Flash Communication Server by default turns off the microphone when it is

not being used. However, you might want to keep it on in your application—for example, to

assure that there is never any delay when the microphone is activated. To do so, use the command

my_mic.setSilenceLevel(0).

Video object

This section includes recommendations to help you optimize your use of the Video object,

including tips on dynamically creating video objects.

Creating video objects dynamically

You can add video objects to your application only from inside the Flash MX authoring

environment, by dragging an embedded video object from the Library to the Stage. However, if

you want to implement video objects from within your ActionScript code, you can do so by

embedding them in a movie clip. This technique lets you create and remove video objects

dynamically using

duplicateMovieClip() and removeMovieClip().

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MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Spezifikationen Seite 161