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compression, standard, algorithm
(MPEG-4 AAC SSR) An AAC flavour supporting different qualities for different targets. One stream can contain up to 3 streams for 11.025 kHz (Stream 1), 22.05 (Stream 1 and 2) and 44.1 kHz (all 3 Streams) sampling frequency. Quality is between Low Profile and Main profile. See also JPEG-2000.