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64kbps AAC/MP4 or 128kbps MP3 - Which is better?
gotPSP
post Apr 22 2008, 21:32
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Hello All,

I'm new here, and have a major question I need answered. I Listen to Pandora Internet Radio (pandora.com), and I've recently noticed that they switched formats. They used to stream 128kbps MP3s, (which were LAME encoded, according to the file header), but now they seem to be sending 64kbps AAC/MP4s. The file identifies itself as "ISO Media, MPEG v4 system, version 2", and it plays properly in mplayer and ffmpeg (ffplay), as well as VLC and Windows Media Player through a Nero Decoder.

In all of those, it sounds great - I can't tell the MP4 apart from the MP3 for the same song. Playing to Quicktime yields the opposite: it sounds horrible, as if it was a 64kbps MP3.

Usually, I can't tell the difference between 128kbps MP3s and higher quality, but this has be baffled. I can't figure out if the MP3 or AAC/MP4 is better. A couple of friends have tried, and none can tell the difference either.

So, the question comes out: which is better: AAC/MP4 or MP3, or are they the same?

Thanks in advance,
gotPSP
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