[FFmpeg-user] Copy input audio in file to two tracks in output audio file

albanyeye rrangaraj at yahoo.com
Wed Nov 21 03:01:12 CET 2012

I have a newbie question regarding conversion from DTS to AAC.
I am on OSX moutain lion and have done some basic conversion from test.mkv
to test.mp4 with the audio being converted from DTS 5.1 to AAC 5.1 using
What I want to do is take the same test.mkv with DTS 5.1 and convert to
test.mp4 with AAC 5.1 and AAC dolby prologic 2 channel for  iphone/ipad as a
fallback audio when the kids want to watch on the road.

Currently I issue
ffmpeg -i test.mkv -acodec libfaac -ac 6 -ar 48000 -ab 192k test-output.mp4

How can I do want I want in 1 command.
Thanks for all the help

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