Adding an additional 2 channel audio track to every MKV file, possible?

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Creating Multiple Audio Tracks from a Single Audio Track

Just a tip, some folks are trying to take a single audio track and convert it into a multiple Audio Tracks. Here is a method used by Wilky13, transcribing: Summary: I want an mp4 file with stream 1: H.264 video, stream 2: 2-ch AAC audio, stream 3: 6-ch AC3 audio. I am modifying the default MP4 High Quality profile. Got handbrake working with: handbrake-audio=-E faac,ffac3 -R auto -B 384 handbrake-audioac3=-E faac,copy:ac3 handbrake-AudioOptimized=true Got ffmpeg working with: ffmpeg-audio=…