Time Base Functions

The Movie Toolbox provides a number of functions that allow you to work with time bases. A QuickTime time base defines the time coordinate system of a movie. However, you can also use QuickTime time bases to provide general timing services. This section describes the functions that allow your application to work with time bases. For a complete description of QuickTime time bases, see "Introduction to Movies," .

This section has been divided into the following topics:

"Creating and Disposing of Time Bases" describes how to create and dispose of time bases and how to assign a time base to a movie
"Working With Time Base Values" discusses functions that allow your application to work with the contents of a time base
"Working With Times" describes a number of functions that allow you to convert times between time bases and to perform simple arithmetic on time values
"Time Base Callback Functions" describes the functions your application may use to condition a time base to invoke functions your application provides

Time base functions do not change the value of the Movie Toolbox sticky error value.

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