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AV1 https://en.wikipedia.org/wiki/AV1

Changelog: https://git.videolan.org/?p=ffmpeg.git;a=blob_plain;f=Change...

Yep. The stb_image.h API is very simple. Also, because its just an #include, you don't need to worry about your users needing to figure out how to link a library.

sox -c 1 -r 48000 -b 32 -e float -t raw out.raw -n spectrogram

Give it a try! The output file contains both very low frequencies and also frequencies up to Nyquist, in this case 24kHz.

This turns an image into a PCM audio file. The image is visible on the spectrogram. For example, here's Ernest Hemmingway punting a beer can: http://imgur.com/QR5a8mw