FFMPEG should be able to output raw AAC audio stream, without any
encapsulation, in the same way that a raw h264 video stream can be output
from FFMPEG. Currently AAC audio can only be output within various
container/encapsulation formats (such as MP4 or ADTS containers). If you
try to output raw AAC by doing "-f aac" it gives the same error as if you
selected any other invalid container format, like "-f abcxyz". Please add
this feature so I can save a truly unencapsulated AAC audio stream.
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