User Guide

514 FLVPlayback Component (Flash Professional Only)
A navigation cue point allows you to seek to a particular frame in the FLV file because it creates
a keyframe within the FLV file as near as possible to the time that you specify. A keyframe is a
data segment that occurs between image frames in the FLV file stream. When you seek to a
navigation cue point, the component seeks to the keyframe and starts the
cuePoint event.
An event cue point enables you to synchronize a point in time within the FLV file with an
external event on the web page. The
cuePoint event occurs precisely at the specified time.
You can embed navigation and event cue points in an FLV file using either the Video Import
wizard or the Flash Video encoder. For more information on the Video Import wizard and the
Flash Video encoder, see Chapter 11, “Working with Video,” in Using Flash.
An ActionScript cue point is an external cue point that you can add either through the
component’s Flash Video Cue Points dialog box or through the
FLVPlayback.addASCuePoint() method. The component stores and tracks ActionScript
cue points apart from the FLV file, and consequently, they are less accurate than embedded
cue points. ActionScript cue points are accurate to a tenth of a second. You can increase the
accuracy of ActionScript cue points by lowering the value of the
playheadUpdateInterval
property because the component generates the
cuePoint event for ActionScript cue points
when the playhead updates. For more information, see
“FLVPlayback.playheadUpdateInterval” on page 626.
In ActionScript and within the FLV file’s metadata, a cue point is represented as an object
with the following properties:
name, time, type, and parameters. The name property is a
string that contains the assigned name of the cue point. The
time property is a number
representing the time in hours, minutes, seconds, and milliseconds (HH:MM:SS.mmm)
when the cue point occurs. The
type property is a string whose value is "navigation",
"event", or "actionscript", depending on the type of cue point that you created. The
parameters property is an array of specified name-and-value pairs.
When a
cuePoint event occurs, the cue point object is available in the event object through
the
info property. For more information, see “Listening for cuePoint events” on page 517.