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Highest Bitrate AAC

post #1 of 2
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What is the highest bitrate AAC? Does an AAC with the same bitrate sound better than an MP3 with the same bit rate? Are AACs of the same bitrate as MP3s smaller in fille size?


The first question is the most important to me.


Thank you, Simon

post #2 of 2

1) The Nero AAC encoder can do Q=1.00 which on average is about 400 kbps for stereo sampled at 44.1 kHz. This is VBR (variable bitrate) of course, so the actual bitrate will vary from way below 400 kbps to over 400 kbps. Other encoders might give you higher max bitrates, but I wonder why you'd need that.

Keep in mind that about 128 - 256 kbps is considered "transparent" for AAC, so going much higher is probably just a waste of space. Btw, mp3 is limited to 320 kbps.


The FAAC encoder is limited to about 320 kbps (Q=500).


Theoretical maximum would be over 6 kbits per channel and frame, so roughly 500 kbps for stereo at 44.1 kHz.



2) Quality varies considerably! AAC at the same bitrate as MP3 will usually have higher sound quality.



3) No, bitrate means how much data is processed per unit of time. It's usually specified in bits or kilobits per second. No matter what format, same kpbs means same size for the same duration.



tldr: see bold stuff

Edited by xnor - 9/14/13 at 5:21pm
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