About MPEG2-AAC [Archive]

19th March 2006, 16:33

Hello:
I'am doing some AAC work recently,and i want to know the different of MPEG2-AAC and the MPEG-AAC. I also want to download some document and sourcecode of MPEG-2 AAC(I have downloaded some, but they all about MPEG4-AAC ).Can anyone help me?
May be this question is too easy, but it's important to me,
thank you for your help.

shon3i

19th March 2006, 16:46

There is no difference in quality only difference in bitstream and i think is better to use MPEG4 beacouse is more compactibe with standalone players

bond

19th March 2006, 21:24

mpeg-4 aac does everything mpeg-2 aac does and more

basically plain mpeg-4 lc-aac is the same as mpeg-2 aac

20th March 2006, 04:03

First thank you for your help.
My work is about MPEG2-AAC, and my purpose is to decode MPEG2-AAC bitstreams, so i must know about the MPEG2-AAC.
I have downloaded the FAAD sourcecode and 3GPP-AAC sourcecode, but they seems more complexity than MPEG2-AAC, Can they decode MPEG2-AAC? If not, where can I download the MPEG2-AAC sourcecode??
Thanks again~~~

bond

20th March 2006, 10:56

faad2 can decode mpeg-2 aac

20th March 2006, 12:35

Oh, thank you again.
you're so kind! ：）

kotrtim

20th March 2006, 15:49

use foobar2000, it uses faad2 for decoding, just use the diskwriter output

http://www.foobar2000.org/

21st March 2006, 06:56

Ok, thank you!
I also have another question: what is the suffix of the MPEG2-AAC file, *.aac or *.mp4 or *.m4a? and where can I download the testing bitstreams of MPEG2-AAC file?

bond

21st March 2006, 19:19

.aac is a raw aac stream not inside a container
.mp4 is a container often used for storing aac (be it mpeg-2 or mpeg-4 aac)
.m4a is a renamed .mp4 used by braindead apple

23rd March 2006, 16:00

ok,thanks again,
and where can I download some streams or music with the extension .aac and .mp4?

SeeMoreDigital

23rd March 2006, 16:59

ok,thanks again,
and where can I download some streams or music with the extension .aac and .mp4?If you install say, Apples iTunes encoder (http://www.apple.com/itunes/download/), you can create AAC (within M4A) music files from your own audio CD's....

Cheers

dimzon

23rd March 2006, 17:15

or you can use FAAC to encode WAV file to AAC or MP4

28th March 2006, 17:04

ok,thanks for the reply :)
i 'am a beginner to AAC field,
and i'am also a beginner to VC6.0.
i have downloaded the FAAD2 2.0 sourcecode,
but i can't compile it correctly,
Could someone tell me what should i do after i unziped the sourcecode??
waiting for your reply~~~
thank you~~~

dimzon

28th March 2006, 18:21

why not to use already compiled FAAD2

29th March 2006, 03:30

why not to use already compiled FAAD2

because i want to study the code,
and i want to know every step of the program,
so i think i must compile the program and look at the running of the program~~~ :)