VisualOn AAC encoder library for audio compression
VisualOn AAC encoder library
libvo-aacenc
$ ffmpeg -i input.wav -c:a libvo_aacenc -b:a 128k output.aac
$ ffmpeg -i input.mp3 -c:a libvo_aacenc -b:a 192k output.aac
$ ffmpeg -codecs | grep aac