MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Specifikace stáhnout pdf (Strana 217)

Motion sensitivity values correspond directly to activity values. Complete lack of motion is an

activity value of 0. Constant motion is an activity value of 100. Your activity value is less than

your motion sensitivity value when you’re not moving; when you are moving, activity values

frequently exceed your motion sensitivity value.

This method is similar in purpose to

Microphone.setSilenceLevel; both methods are used to

specify when the

onActivity event handler should be invoked. However, these methods have a

significantly different impact on publishing streams:

• Microphone.setSilenceLevel is designed to optimize bandwidth. When an audio stream is

considered silent, no audio data is sent. Instead, a single message is sent, indicating that silence

has started.

• Camera.setMotionLevel is designed to detect motion and does not affect bandwidth usage.

Even if a video stream does not detect motion, video is still sent.

Example

The following example sends messages to the Output window when video activity starts or stops.

Change the motion sensitivity value of 30 to a higher or lower number to see how different values

affect motion detection.

// Assumes a Video object named "myVideoObject" is on the Stage

c = Camera.get();

x = 0;

function motion(mode)

{

trace(x + ": " + mode);

x++;

}

c.onActivity = function(mode) {motion(mode);};

c.setMotionLevel(30, 500);

myVideoObject.attachVideo(c);

See also

Camera.activityLevel, Camera.motionLevel, Camera.motionTimeOut, Camera.onActivity

Camera.setQuality

Availability

• Flash Player 6.

• Flash Communication Server MX (not required).

Usage

activeCamera.setQuality(bandwidth, frameQuality)

Parameters

bandwidth An integer that specifies the maximum amount of bandwidth the current outgoing

video feed can use, in bytes per second. To specify that Flash video can use as much bandwidth

as needed to maintain the value of

frameQuality, pass 0 for bandwidth. The default value

is 16384.

frameQuality An integer that specifies the required level of picture quality, as determined by

the amount of compression being applied to each video frame. Acceptable values range from 1

(lowest quality, maximum compression) to 100 (highest quality, no compression). To specify that

picture quality can vary as needed to avoid exceeding

bandwidth, pass 0 for frameQuality. The

default value is 0.

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