Creating Slit Scan Images from Quicktime Movies with FFMpeg on Mac OS X

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I have been filming out the window of subways lately and have come up with a foolproof method for creating slit scan images out of these vignettes. I use an iPhone 5s held in portrait mode, so the instructions below include a rotation of the video before compositing.

If they’re not already installed, install ffmpeg and imagemagick using Homebrew:

$> brew install imagemagick
$> brew install ffmpeg

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