It is disclosed inter alia a method for forming an audio payload frame, wherein the audio payload frame comprises: an encoded audio data frame with a first marker bit at the front of the encoded audio data frame, wherein the first marker is set to a first value, and wherein the first value denotes a type of encoded audio data in the encoded audio data frame; an extension encoded audio data frame; and a second marker bit in front of the first marker bit, wherein the second marker bit is set to a second value; and wherein the second value denotes a type of encoded audio data other than the type of encoded audio data in the encoded audio data frame.
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