[Alfie Newson]

Thanks for responding John, I think the speed expression would be useful if I was using animated layers inside after effects however all I have is a static mp4.

If you’re interested, I found a way around that by using the subtraction blend mode to give an indication of speed.

– (By stacking one clip above and moving it one or two frames forward, I could see how much movement there was by how much colour difference there is per frame.)

– That gets me the average speed in each frame by going b+w and notching up Gaussian blur.

– Now I’m trying to find a way to gather up the colour data to use it for animating the audio.

Cheers,
Alfie