From a Julia program, run a ffmpeg shell command on a folder of files to make a mp4 movie

General Usage
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Take a look at:

I’d recommend trying to use iterative encoding to build the video in place, which avoids the unnecessary round trip of JPEGs to & from your hard drive.
If you want to stick to your strategy of calling FFMPEG from the shell within Julia, see this old post: Creating a video from a stack of Images - #8 by stillyslalom

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