Totally agree with tebasuna...
If you prefer to use FFMpeg for AAC encoding, have a look here:
https://trac.ffmpeg.org/wiki/Encode/AAC
From their FAQ:
Quote:
Which encoder should I use? What provides the best quality?
For AAC-LC the likely answer is: libfdk_aac > libfaac > Native FFmpeg AAC encoder (aac) > libvo_aacenc.
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The libfdk_aac encoder is free, but it does not conform to the GPL, so the FFMpeg developers consider it illegal to distribute FFMpeg versions where libfdk_aac is included. But you can get FFMpeg binaries without libfdk_aac in it which enable its use if the separate Fraunhofer DLL resides in the same folder.
You can get such FFMpeg binaries and also the libfdk_aac DLL at Sherpya's MPlayer site:
http://oss.netfarm.it/mplayer/
Cheers
manolito