Dissolve (clip1, clip2 [, ...], int overlap, float "fps")
Dissolve is like AlignedSplice, except that the clips are combined with some overlap. The last overlap frames of the first video stream are blended progressively with the first overlap frames of the second video stream so that the streams fade into each other. The audio streams are blended similarly.
With audio only clips, by default, overlap is in units of 1/24th seconds. Set Fps=AudioRate() if sample exact audio positioning is required.
The term "dissolve" is sometimes used for a different effect in which the transition is pointwise rather than gradated. This filter won't do that.
Also see here for the resulting clip properties.
$Date: 2005/01/21 07:48:43 $