MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Dokumentacja Pobierz pdf (Strona 214)

Client-Side Communication ActionScript 23

To determine how to set a value for keyframeInterval, consider both bandwidth use and video

playback accessibility. For example, specifying a higher value for

keyframeInterval (sending

keyframes less frequently) reduces bandwidth use. However, this may increase the amount of time

required to position the playhead at a particular point in the video; more prior video frames may

have to be interpolated before the video can resume.

Conversely, specifying a lower value for

keyframeInterval (sending keyframes more frequently)

increases bandwidth use, because entire video frames are transmitted more often, but may

decrease the amount of time required to seek a particular video frame within a recorded video.

See also

Camera.keyFrameInterval

Camera.setLoopback

Availability

• Flash Player 6.

• Flash Communication Server MX (not required).

Usage

activeCamera.setLoopback(compressLocalStream)

Parameters

compressLocalStream A Boolean value that specifies whether to use a compressed video

stream (

true) or an uncompressed stream (false) for a local view of what the camera is receiving.

The default value is

false.

Returns

Nothing.

Description

Method; specifies whether to use a compressed video stream for a local view of the camera. This

method is generally applicable only if you are transmitting video using the Flash Communication

Server; setting

compressLocalStream to true lets you see more precisely how the video will

appear to users when they view it in real time.

Although a compressed stream is useful for testing purposes, such as previewing video quality

settings, it has a significant processing cost, because the local view is not simply compressed; it is

compressed, edited for transmission as it would be over a live connection, and then decompressed

for local viewing.

To set the amount of compression used when you set

compressLocalStream to true, use

Camera.setQuality.

Example

In the following example, if the user presses a loopback button, the loopback value is set to true.

on (press) {

if (_root.myCam.loopback==false) {

_root.myCam.setLoopback(true);

} else {

debugWindow+="You’re already compressing the stream." + newline;

}

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