This is what happens when you transcode the same audio file 4 times with @ffmpeg AAC, vs. libfdk_aac, at 128kbps (the docs say it's better than libfdk_aac at that bitrate): https://mrcn.st/t/orig_ffmpeg_fdk_4x.wav …
looping {1 bar lossless - 1 bar ffmpeg - 1 bar fdk}
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My *actual* "I noticed the ffmpeg aac encoder is bad again" use case that brought things up again, this time, was 256kbps MP3 -> 320kbps ffaac -> 320kbps ffaac, which is much gentler and I *expected* it to be transparent, but it wasn't. The second ffaac had quite noticeable loss.
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But the last time I tried to bring loss of that level up to the person working on the AAC encoder at the time I was dismissed, so here I am saying "okay, let me do it 4 times at 128kbps to try to prove my point in a way anyone can hear".
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