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mp3/aac clipping comparison

post #1 of 2
2/18/11 at 3:51pm
Thread Starter 

i was testing out different bitrates between mp3 and aac, (Blink 182 - pathetic, from dude ranch), and i found that the mp3 version had much more clipping than the aac version. is there a reason for this, like compression techniques or something? just curious. btw, BOTH files were ripped in their respective formats directly from the cd, no files were transcoded.

 

the red lines indicate clipping, for those who dont know, but i think most people on here would already know. happy_face1.gif

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post #2 of 2
2/19/11 at 5:22am

A tendency to generate overshoot is not unusual in FFT-based lossy formats (Gibbs' phenomenon at work), and in fact MP3 is one of the worse offenders here. This has been known for years. It is not a problem if decoder and playback chain offer sufficient headroom. Usually Replaygain or similar takes care of that, and in non-cooperative environments one can still use MP3Gain. For a little demonstration, you can make the imported MP3 a few dB quieter in Audacity (decoding to float32 allows for peaks in excess of 0 dBFS).

 

Now if the MP3 were played back as-is, there may well be audible degradation. Don't blame the format, blame those morons insisting on making everything as loud as possible.

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