Animated QR file transfer: good optical modem, bad file-transfer product

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A trending repo, deedy/qr-data-transfer, streams a file as animated QR codes on your screen and reads them back with a phone camera. Three things are true at once: the engineering is good, the idea is eight years old, and as a general file-transfer tool it loses to a USB stick by two to four orders of magnitude. Why RaptorQ is the right codec for a one-way lossy channel with no back-channel, why…

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