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Chapter 10. Expressions > Offsetting Layers and Time

Offsetting Layers and Time

Some of the coolest things you can do with expressions involve incrementing either layer index numbers (the number of the layer that you always see to the left of the source name) or time itself. Time in expressions is measured in whole seconds. Frames and fields are calculated as decimal fractions of seconds. Of course, if you're ever worried about calculating this, you can use fractions instead: in 24 fps footage, frame 65 would be time = 65/24 (or 2.7083 seconds). See how easy?

A frame's index and time become especially useful when using conditionals. In the example expression, you will use index and time to average grain between several frames of a sequence. Although I'm still trying to keep this simple, this means moving beyond the one-liner expressions that can be applied and tweaked easily.


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