Macromedia flash media server 2-client-side actionscript language reference for flash media server 2 Benutzerhandbuch

NetStream class

93

Description

Event handler; invoked when the Flash Player receives descriptive information embedded in 
the FLV file being played.

The Flash Video Exporter utility (version 1.1 or later) embeds a video's duration, creation 
date, data rates, and other information into the video file itself. Different video encoders 
embed different sets of metadata.

This handler is triggered after a call to the 

 method, but before the video 

playhead has advanced.

In many cases, the duration value embedded in FLV metadata approximates the actual 
duration but is not exact. In other words, it will not always match the value of the 

 property when the playhead is at the end of the video stream.

Example

The code in this example starts by creating new NetConnection and NetStream objects. Then 
it defines the 

onMetaData()

 handler for the NetStream object. The handler cycles through 

every named property in the 

infoObject

 object that is received and prints the property's 

name and value.

var nc:NetConnection = new NetConnection();
nc.connect(null);
var ns:NetStream = new NetStream(nc);

ns.onMetaData = function(infoObject:Object) {
    for (var propName:String in infoObject) {
        trace(propName + " = " + infoObject[propName]);
    }
};

ns.play("http://www.helpexamples.com/flash/video/water.flv");

The code in this example causes the following information to be displayed:

canSeekToEnd = true
      videocodecid = 4
      framerate = 15
      videodatarate = 400
      height = 215
      width = 320
      duration = 7.347

The list of properties varies depending on the software that was used to encode the FLV file.