Encoder aac [AAC (Advanced Audio Coding)]:
    Supported sample rates: 96000 88200 64000 48000 44100 32000 24000 22050 16000 12000 11025 8000 7350
    Supported sample formats: fltp
AAC encoder AVOptions:
-stereo_mode       <int>        E...A. Stereo coding method (from -1 to 1)
   auto                         E...A. Selected by the Encoder
   ms_off                       E...A. Disable Mid/Side coding
   ms_force                     E...A. Force Mid/Side for the whole frame if possible
-aac_coder         <int>        E...A.  (from 0 to 3)

