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Add single pixel to .gif file using ffmpeg

I have several thousand .gif files (with alpha channels) and I want to add a single red pixel (no transparency) in the bottom left hand corner of each .gif file. Each one has different dimensions. How ...
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Upscale Gif File with Nearest Neighbor Interpolation (Integer Multiple) on Windows (Gifsicle)

I want to upscale a .gif file with nearest neighbor interpolation on Windows from commandline (I am scaling by integer multiples). I have tried gifsicle 1.92 but for some reason it doesn't work ...
EllipticalInitial's user avatar