Absolute Time Double Parameters

Double parameters with their kOfxParamPropDoubleType property set to kOfxParamDoubleTypeAbsoluteTime are interpretted as an absolute time from the begining of the effect. The host can represent these as frames, seconds, milliseconds, millenia or whatever it feels is appropriate. However, a plugin sees such values in 'frames' from the beginning of a clip. Applicable only to 1D double parameters. It is an error to set this on any other type of double parameter.

For example a plugin that stabalises all the images in a clip to a specific frame would have a 'reference frame' parameter and declare that as an absolute time parameter and use its value to fetch a frame to stablise against.