ffmpeg -i 3.mka -filter_complex amerge=inputs=3 -c:a pcm_s16le output.mka
For playback of multi-channel files, it might help to use a player that visually shows what's happening in each channel (given you're listening in stereo as I am). If you're using Windows, ffdshow displays the individual channel volumes in it's volume filter, or foobar2000's output meter adapts according to the number of channels being decoded and their layout. It can help to at least see where stuff is when it's not where it's supposed to be.
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Last edited by hello_hello; 10th May 2016 at 21:15.