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ISO IEC 14496-3 (MPEG-4 Audio):channelConfigurationIndex
ISO IEC 23003-3 (USAC):channelConfigurationIndex: "determines the channel configuration [...] Channel configurations, meaning of channelConfigurationIndex, mapping of channel elements to loudspeaker positions"
ISO IEC 14496-3:
Fix the muxer in order to correctly fill channelConfigurationIndex (and/or extensionChannelConfiguration in case of AAC PS) with the right value, then remux the content.