loudnessInfoCount is 0
ISO IEC 23003-3 (USAC):loudnessInfoCount: Common sense, no need of loudnessInfoSet if there is no loudnessInfo and it is considered as if missing
ISO IEC 23003-4 (DRC):loudnessInfoSet
ISO IEC 23003-3:Configure or update the encoder in order to set at least 1 instance of loudnessInfo, then reencode the content.
Audio Coding Syntax