Most timing properties are expressed in both seconds (s) and frames (f). When specifying seconds to modify a **Clip Timing** property, all decimal values are accepted. When specifying frames, only integer values are accepted. For example, if you attempt to enter 12.5 in a frames (f) field, it is set to 12 frames.
Depending on [the selected Clip Edit mode](clp_about.md), changing the **Start**, **End**, or **Duration** may ripple or replace Activation clips on the same track.
|**Property** |**Description** |
|:---|:---|
|**Start**|The frame or time (in seconds) when the clip starts.<br/>Changing the Start also affects the End. Changing the Start sets the End to the new Start value plus the Duration.|
|**End**|The frame or time (in seconds) when the clip ends.<br/>Changing the End also affects the Start. Changing the End sets the Start to the new End value minus the Duration.|
|**Duration**|The duration of the clip in frames or seconds.<br/>Changing the Duration also affects the End. Changing the Duration sets the End to the Start value plus the new Duration.|