SMIL Timing

There are many timing attributes that you can use in clips or hyperlinks. The following sections describe the most commonly used attributes and the values that you can use in SMIL timing attributes.

Timing Values and Examples
Timing Marker	Specifies	Example	Example Value
`h`	hours	`begin="2.5h"`	2 hours, 30 minutes
`min`	minutes	`begin="2.75min"`	2 minutes, 45 seconds
`s`	seconds	`begin="15.55s"`	15 seconds, 550 milliseconds
`ms`	milliseconds	`begin="670.2ms"`	670.2 milliseconds

To set a Begin Time

This part introduced how to the begin attribute, which creates a timing delay. Using the begin attribute, you can vary the point at which a hyperlink becomes active and a clip starts to play back within the presentation timeline:

In the preceding markup, the begin attribute delays the clip playback for 10.2 seconds. Were this clip in a sequence, there would be 10.2 seconds of blank time before the clip starts.

Using Clip Begin and Clip End Times

The clipBegin and clipEnd attributes specify a clip's internal timing mark where playback begin and end. They allow you to play just part of a clip that has an internal timeline, such as an video,audio or animation clip. They have no effect on group or static clips such as still images, though. The example given below uses clipBegin and clipEnd with a video clip:

Here, the clip starts playing at its internal 10-second mark rather than at its encoded beginning. It stops when it reaches its 50-second mark, having played for a total of 40 seconds.

Specifying a Duration

The dur attribute controls how long a clip plays. The following example ends the video after 80 seconds, regardless of the length of the clip's internal timeline. If the video's timeline is shorter than 80 seconds, the video's last frame appears frozen onscreen until the duration elapses:

A common use of dur is to control how long a static clip such as an image appears onscreen. The example below displays an image for three minutes:

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