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ffmpeg - re-encode audio into additional stereo track, do not re-encode video
ffmpeg -i "input.mkv" \
-map 0:0 -map 0:1 -map 0:1 \
-c:v copy \
-c:a:0 libfaac -b:a:0 192k -ac 2 \
-c:a:1 copy \
"output.conv.mkv"
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