[FFmpeg-user] What is the range of the quality options for AAC encoders?

[Werner Robitza]

FFmpeg documentation tells us that "aq" (or "q:a") sets the VBR audio
quality and that it's codec-specific.

- libfaac: We can get a hint from the faac binary's help. Possible values:
[10, 500], default: 100. Do these values apply to FFmpeg as well?
- libvo_aacenc: Examining the source code of libvo_aacenc there seems to be
no such option altogether. Is this true?
- aac: Judging from the FFmpeg full help, there's no option here. True?
- libfdk_aac?
- libaacplus?