[FFmpeg-user] backtrack parameters from existing file

[Lou]

On Sat, 5 Jan 2013 07:49:49 +0000 (UTC)
Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> -ar 22050 -ab 48k
> (different aac encoders exist)

To expand Carl's comment there are four AAC-LC encoders you can use
with ffmpeg (excluding external ones you can pipe to):

* aac
* libvo_aacenc
* libfdk_aac
* libfaac

All but "aac", the native FFmpeg AAC encoder, are external libraries
and require that your ffmpeg is configured with the appropriate options.