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MP4 audio
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michaelberg
Posted 10/1/2007 10:05 PM (#1409)
Subject: MP4 audio




Posts: 3

I got a USB mp4 player for x-mas that supposedly will play mp4 audio files, which I understand are much more compact than mp3. Is there any mp3 to mp4 conversion software out there that you would recommend? I'm using WinXP SP2
Thanks,
Mike

Edited by michaelberg 10/1/2007 10:11 PM
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Cole
Posted 10/1/2007 10:53 PM (#1410 - in reply to #1409)
Subject: RE: MP4 audio


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Converting from mp3 to mp4 would mean an incredible loss of quality, it would be worse than a cheap analogue tape.
mp4 uses AAC, the bitrates are lower in some cases but the quality at a low bit rate is very poor.
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michaelberg
Posted 11/1/2007 5:07 PM (#1414 - in reply to #1410)
Subject: RE: MP4 audio




Posts: 3

Then what is the purpose of an mp4 audio file? Why the hype of getting an mp4 player instead of an mp3 player?
Also, what format and bitrate would you recommend for the most compact file size for ripping tracks off of a spoken word (no music) CD? I just want to be able to undestand what the people are saying, these are audio training CDs.
Thanks,
Mike Berg
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Cole
Posted 11/1/2007 6:39 PM (#1415 - in reply to #1409)
Subject: RE: MP4 audio


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Most people are going crazy over MP4 simply because it's new.
It does have some size advantages over mp3 but this improvement is almost immediately lost by the use of AAC audio within the mp4 file container, because AAC has no advantage over mp3 at low bitrates.
AAC is better with high bitrates, that is when it leaves mp3 behind.

Spoken word in mp3 at 96kbps would be ok and many applications can convert at that rate.
Lower than 96kbps would produce high noise levels.

Hope that helps.
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michaelberg
Posted 12/1/2007 10:09 PM (#1418 - in reply to #1415)
Subject: RE: MP4 audio




Posts: 3

One last question. What is the difference between .wma and .mp3?
Thanks so much
Mike Berg
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Cole
Posted 14/1/2007 3:16 AM (#1422 - in reply to #1409)
Subject: RE: MP4 audio


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.wma is Windows Media Audio, it's quite different from mp3's in that you can achieve low bitrates with very little noise, but lose dynamic range (high and low frequency audio).
WMA has compatibility issues with portable players, older media players etc.
Hi end users will tell you that WMA sounds muddy or clouded.
WMA also features DRM (Digital Rights Management) to stop piracy and enable per system/license limitations.
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