Key Framing Speed

Been asked many times before:

It’s a reasonable request, but it is unlikely variable playback speed will be implemented in Shotcut due to the complexity of the problem. Shotcut always needs to know the exact length of each clip. It is difficult to calculate the length of a clip if the speed changes multiple times throughout.

http://slowmovideo.granjow.net/ is a great tool for this specific effect.

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