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libfaac is a safe aac default, but aacplus works MUCH better at the the 8 - 16 kbps range, which seams to be a stated goal of this page. It turns on SBR+PS and has ffmpeg support.

If any Dropbox people are reading this, can you comment on what criteria you used to pick the audio codec?

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Hello there, Pierpaolo from Dropbox here.

You correctly guessed that we picked libfaac as a safe option for compatibility. I never tried out aacplus and sounds indeed interesting so we'll likely try it out soonish. Our target rate is a bit higher than those you mention though. For audio, we target 32kbps at low quality layers and 96kbps at higher qualities. Couple of questions for you: - how does aacplus works at these rates? - what compatibility issues can we expect if we were to try it out?

HE-AAC (AAC+) sounds surprisingly fantastic at 32kbps.

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