Describe AacPreset here
[_presets_] version=0.10 element-name=GstFAAC [Profile Low Complexity] _meta/comment=Low Complexity Profile profile=LC [Profile Main] _meta/comment=Main Profile profile=MAIN [Profile Sample Rate Scalable] _meta/comment=Sample Rate Scalable Profile profile=SSR [Profile Long Term Prediction] _meta/comment=Long Term Prediction Profile profile=LTP [Quality Low] _meta/comment=Low quality bitrate=96000 [Quality Normal] bitrate=128000 [Quality High] bitrate=200000