Time in DirectShow Editing Services

To edit video, you must work with some important timing concepts. For example:

• Each clip has a duration.
• Clips, transitions, and effects appear at certain times in a project.
• Video has a frame rate, expressed in frames per second (fps).

Microsoft® DirectShow® Editing Services (DES) contains numerous methods that deal with times or frame rates, and the meaning of these values depends on the context. This article describes the various time measurements used in DES. It contains the following sections.

• Time Values
• Frame Rates