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A comment on Moo Card Player. Parent comment
Using Opus at a ridiculously low quality, you can probably fit a standard 3 minute pop song in ~200KB.
A QR code, with minimum error correction, can fit a maximum of about 4KB. So a square of 7x7 codes would be enough.
The largest type 40 codes are 177x177px. So that's about 1,200px square.
Depending on the resolution of your camera, and how far away it is, you might be able to squeeze that onto an A5 print out.
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Using Opus at a ridiculously low quality, you can probably fit a standard 3 minute pop song in ~200KB.
A QR code, with minimum error correction, can fit a maximum of about 4KB. So a square of 7x7 codes would be enough.
The largest type 40 codes are 177x177px. So that's about 1,200px square.
Depending on the resolution of your camera, and how far away it is, you might be able to squeeze that onto an A5 print out.