There is no problem to make a file with any channel configuration one would like.
That an encoder/muxer rejects a file, it does because their programmers consider that certain configurations have no sense (no HW supported), not because it cannot be done.
In a Jesusian parable: a computer may equally split an invoice among 3 people, just that in real life no one can pay 33€ and 33.33 cents.
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Born in the USB (not USA)
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