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Topic: MPEG-2 vs MPEG-4 AAC (Read 6534 times) previous topic - next topic
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MPEG-2 vs MPEG-4 AAC

What is the difference(quality) between MPEG-2 AAC & MPEG-4 AAC?

LC, Main & LTP profile, what is the difference

What would be the best encoder for AAC?

MPEG-2 vs MPEG-4 AAC

Reply #1 –
There is no real quality difference, the actual AAC data is basically the same. However, the LTP profile is only used in MPEG-4 and could provide better quality on some samples when using an encoder that has a well optimised LTP module.

The best AAC encoder is of course the Nero AAC plugin , which will be released really soon.

Menno

MPEG-2 vs MPEG-4 AAC

Reply #2 –
Quote
What is the difference(quality) between MPEG-2 AAC & MPEG-4 AAC?

There is none yet, because this has been the same since the finalization of MPEG-2 AAC in 1997. But when AAC+ will be standardized as a core element of MPEG-4, it will drastically change the quality of low bitrate encodings, but not for high bitrates, because SBR is a tool for 64 kbps and below.

Quote
LC, Main & LTP profile, what is the difference


If the short explanations I gave recently in other threads aren't enough, you could read the MPEG-2 FAQ of the MPEG Audio Subgroup, the technical FAQ from the Dolby website or the dissertation of Ye Wang (141 pages, also from his other publications) where he also gives a very good overview of several tools used in different codecs for enhancing the sound:

http://www.hydrogenaudio.org/forums/index....4048&hl=ye+wang

Quote
What would be the best encoder for AAC?


One that beats the sh*t out of the FhG evaluation build at 64 kbps, is free of charge, open source and comes with a one-year subscription to my local pizza service at no cost. Unfortunately this doesn't exist, so we'll have to wait for Nero's plugin and/or the CodingTechnologies demo version of aacPlus, I'm afraid.
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