I don't think whatever method you're using to convert the image to PCM samples is correct/useful. Here are my results for MP3, Vorbis, Opus, at default settings, with the image interpreted as 8-bit mono samples.pic.twitter.com/pIoq2yuSBk
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You can see that the noise isn't nearly as bad (these formats do not murder the data *that* much), and it's also clear that MP3 does not preserve the boundaries because it does not support seamless playback (which causes the horizontal shift and color change due to RGB mismatch).
Meanwhile in the Opus output you can clearly see the effect of the DC removal filter, which means solid areas tend towards grey.
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FWIW this is what I used: convert img_MIKU_us.png -depth 8 rgb:- | sox -t raw -r 44100 -c1 -b 8 -e unsigned-integer - -t wav - | opusenc - - | sox -t opus - -t raw -r 44100 -c1 -b 8 -e unsigned-integer - | convert -size 462x710 -depth 8 rgb:- miku_opus.png
Thanks. Twitter will use this to make your timeline better. UndoUndo
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See my command line later; I convert the image to 8-bit raw RGB and then interpret it as 8-bit unsigned mono samples. I think you must have a signed/unsigned mismatch somewhere, or you're mixing 8-bit and 16-bit. That might explain the extreme noise in place of some flat colors.
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