That's a completely different case than (perceptual) compression of audio. Binary (non audio) data can have regularity (and also complexity) several magnitudes larger than usual audio data. Binary (non audio) data can have repetitive patterns spanning larger ranges than what could be found by brute force search. So it can make sense to tune a lossless data compressor for specifically structured patterns out of the infinite problem space. With the exception of looped, electronic music the same is not usually true for audio.
.________________________________________________________________________| | | | || Test Sample | Transients | Stereo Image | Tonality || | Lo-Freq Hi-Freq | Direction Width | Noise Tremolo ||_________________|__________________|__________________|________________|| | | | || Kalifornia | + + | | || | | | || Robots | + | | + || | | | || Applause/Harlem | + | + | || | | | || Fallen/Linchpin | + | + | || | | | || Can't Wait | | + | || | | | || Memories | | + | || | | | || Waiting | | + | || | | | || Since Always | | + | || | | | || Hancock | | + | || | | | || Berlin Drug | | | + || | | | || Trumpet/Rhumba | | | + || | | | || Creuza | | | + || | | | || Girl | | | + || | | | || Metropolis | + | | + || | | | || SQAM Selection | + | | + + || | | | || (Velvet,spahm) | | | ||_________________|__________________|__________________|________________|
Does anyone know an item not mentioned yet on which both nero and QT/iTunes do really bad at 128kb?
SQAM Selection: a concatenation of items from the Sound Quality Assessment Material CD released in 1988 by the European Broadcasting Union:http://tech.ebu.ch/publications/sqamcdThis collection is widely used in the scientific literature, so why not include it here. It's now available free of charge for research and development purposes! The tracks used will be 32 (triangle), 35 (glockenspiel), and 40 (harpsichord).