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Coreaudio gives us a channel map with all entries set to kAudioChannelLabel_Unknown. This is translated to a mpv channel map with all channels set to NA, which has special meaning: it's an "unknown" channel map, which acts as wildcard and can be converted from/to any channel layout. Not really what we want. I've got this with USB audio, playing stereo. The multichannel layout consisted of 2 unknown channels, while the stereo channel map was stereo (as expected). Note that channel maps with _some_ NA entries are not affected by this, and must still work.