Long exposure images from videos

Last summer, I was at the Chaudiere Falls in Ottawa. A long exposure photo would have been perfect to capture the turbulent cascades of the falls. Unfortunately, I didn’t have an ND filter with me. Instead, I decided to capture a short video on my phone to see if I could convert its frames into a long exposure. There’s probably better ways to do this using Photoshop or GIMP, but I wanted to do this using a simple command line script that takes a video and generates an image. Steps to convert a v...

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