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Dissolve(clip clip1, clip clip2 [,...], int overlap)
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.
The term "dissolve" is sometimes used for a different effect in which the transition is pointwise rather than graduated. This filter won't do that.