FFmpeg 9.1 ships a new AAC encoder, tuned by ear and CBR-only (hydrogenaudio.org)
The new encoder even ships a deliberate workaround: its author found FFmpeg's own AAC decoder mishandles stereo PNS, so the encoder compensates to keep playback correct.
It is constant-bitrate only and tuned for 48kHz, with 44.1kHz and 96kHz working but discouraged.
The catch skeptics keep raising: on the same benchmark, Opus beats every AAC encoder even at 64 kbps.
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