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Also it seems the ffmpeg aac encode has a 0.5dB gain reduction for some reason. The original song leaks through because of that, bumping up by 0.5dB fixes it.
Looks like most of the issue here was due to the original being very hot (in the stream it would've been lower). Redoing the test with volume reduction...
Here we go. libfdk_aac is arguably better than lame (it runs on 16-bit int math so it can't handle overshoots well at all, after lowering the gain it's fine), ffmpeg is *terrible* in comparison to both. https://mrcn.st/t/lame_vs_fdk_vs_ffmpeg_delta_lower.wav …
Substracting resulting encode of two psycho acoustic codecs is not a proper way to compare audio signal, but yes, the main difference in the high frequency, and I agree with you, I can hear high-pitched 'hiss' too.
Check how @SoundExpertOrg does testing:
http://soundexpert.org/articles/-/blogs/visualization-of-distortion …
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