Quote:
Originally Posted by has7738 
The test sample is a little small, but adequate at 30 people. The tests were presented on headphones only, but IMHO (will that suffice?) the Sony MDR-7506 headphones are quite unforgiving and revealing of audible flaws. The are one of the more musically unforgiving headphones, which makes them great for analytical listening, but not exactly fun. If anything they probably made the testers hyper-sensitive to audible anomalies. AAC was not tested at bit rates higher than 128Kbps, and the Test Results chart therefor shows only three data points for AAC. Oddly, several of the other codecs are also missing data points, so a detailed comparison is not possible. In the chart "How The Formats Compare" we see AAC already at a 4.8 at 128Kbps (5=identical to original CD), with no test data for 256Kbps, much less 320Kbps which I have suggested. We could extrapolate that given higher data rates the AAC codec might have scored a 5, but that would strictly be conjecture.

The test sample is a little small, but adequate at 30 people. The tests were presented on headphones only, but IMHO (will that suffice?) the Sony MDR-7506 headphones are quite unforgiving and revealing of audible flaws. The are one of the more musically unforgiving headphones, which makes them great for analytical listening, but not exactly fun. If anything they probably made the testers hyper-sensitive to audible anomalies. AAC was not tested at bit rates higher than 128Kbps, and the Test Results chart therefor shows only three data points for AAC. Oddly, several of the other codecs are also missing data points, so a detailed comparison is not possible. In the chart "How The Formats Compare" we see AAC already at a 4.8 at 128Kbps (5=identical to original CD), with no test data for 256Kbps, much less 320Kbps which I have suggested. We could extrapolate that given higher data rates the AAC codec might have scored a 5, but that would strictly be conjecture.
Even though this is an about About.com publication (doesn't speak for it's credibility), there you go. At 128kbs, AAC scores a 4.8, mp3 a 4.7. Those numbers are indistinguishable, given that the size of the sample set is only 30 people, the lack of other statistical data, and the lack of other information about the methodology. And at 256, MP3 got a 4.9. Certainly suggests that a large number of people can't tell the difference between those formats and lossless when it comes to high bit rate AACs and MP3s. And no way to know if AAC "might have scored a 5" since there's no guarantee that additional less compression equals less perceived difference; to even state that the extrapolation might be possible, but conjecture, is spinning the data.
Quote:
Originally Posted by has7738 
I will have to disqualify any VBR file as being inappropriate because of what it does to the ability to fast-forward. VBR files confuse many players because, well, the bit rate is variable. For example I have dozens of .mp3 VBR files that are all 55 minutes in actual length, yet if you grab the play slider and try to go to, say, the 30 minute mark, you can't.

I will have to disqualify any VBR file as being inappropriate because of what it does to the ability to fast-forward. VBR files confuse many players because, well, the bit rate is variable. For example I have dozens of .mp3 VBR files that are all 55 minutes in actual length, yet if you grab the play slider and try to go to, say, the 30 minute mark, you can't.
Most people don't listen to 55 minute music files unless they are collecting shows. So certainly not a relevant concern for most of us. If it doesn't work for you, that's a fine reason to choose AAC. But it's a red herring regarding which high bit rate format is better sonically.












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