Notes From James
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Using FFMPEG to add a aac stream to a video with ac3   James - Thursday, January 1, 2015, 11:49 am

The following command line uses ffmpeg to change an avi file to an mp4 file, while adding a stereo AAC audio track in stream one for Roku compatibility.

ffmpeg -i input.avi -map 0:v -c:v copy -map 0:a:0 -ac 2 -c:a libfdk_aac
       -map 0:a -c:a:1 copy output.mp4

In retrospect, I wonder if the first -map 0:a:0 should be just -map 0:a.

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