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offtopic question but can this be used to compress base64 images?

Yes! Decode the base64, run through mozjpeg, re-encode. For PNGs, I've had the best results on average with pngwolf-zopfli: https://github.com/jibsen/pngwolf-zopfli

off topic but has anybody turned a series of compressed base64 into a video stream?

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