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In the xfade filter, the speed of transition may be controlled by the duration= parameter – longer duration implies slower transition and vice versa.

So why are there – beside the fade value for the transition= parameter – other 2 values for the same effect, fadefast and fadeslow? What is the difference?

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They differ in rate of progression, i.e. fade is a linear progression, so that at half the duration, fade status is 50% i.e. both inputs are equally mixed. For fadefast, it starts fast and then slows down. Opposite for fadeslow.

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