Aac to Replace MPEG Audio? - Page 2

andybno1 · #21 05-11-2003, 06:35 PM

so would encoding with acc produce mpgs with better 5.1 sound?

kwag · #22 05-11-2003, 08:34 PM

Quote:

Originally Posted by andybno1

so would encoding with acc produce mpgs with better 5.1 sound?

The AAC specifications are designed for 48 channels

Edit:
Quoting:
"AAC is able to include 48 full-bandwidth (up to 96 kHz) audio channels in one stream plus 15 low frequency enhancement (LFE, limited to 120 Hz) channels and up to 15 data streams. Besides it has further multi-language capacities."
http://faac.sourceforge.net/wiki/index.php?page=AAC

Latexxx · #23 05-12-2003, 12:45 AM

Quote:

Originally Posted by kwag

I am going to compare the quality to the one produced by Apple's iTunes program, which supports MPEG-4 AAC audio. Apple did screw something up in the encoder, because their format doesn't play in any Windows AAC CODEC

( Propietary insurance i guess

)
I have tried several CODECS for WinAmp, and they don't play Apple's AAC format. Same thing if I encode an AAC with PsyTEL encoder on windows, it won't play in iTunes in a MAC

Have you tried converting them to .mp4 files? Some basic info: http://forum.doom9.org/showthread.php?threadid=47748

Some differences between different aac files : http://www.hydrogenaudio.org/index.p...ST&f=14&t=5419

[EDIT]
How to put Psytel aac to ipod:
http://www.hydrogenaudio.org/index.p...T&f=13&t=9055&

jorel · #24 05-12-2003, 02:17 AM

hey boys,
what do you are trying to test?

ideas?

kwag · #25 05-12-2003, 08:28 AM

@Latexxx,

I tried encoding with the PsyTEL in my PC, and although it plays fine in WinAmp with the AAC CODECs, it doesn't play on the Mac in iTunes. No matter what extension I change it to. But I'll try to follow the procedure described in the link at hydrogenaudio. Maybe that way it will play in iTunes. I'm now considering a Philips EXP 401 MP3 CD Player, instead of an iPod

That player plays MP3 and AAC in small CD-R's

So I guess it's more flexible than the iPod, because if many manufacturers start to do that (Panasonic did it to in a small E-Wear player that also plays MP3 and AAC), I can transport my files between different machines. Not the case with the iPod

http://www.design.philips.com/news_c..._cd_player.asp

-kwag

kwag · #26 05-15-2003, 09:46 PM

Hi people,

DON'T buy the Philips EXP 401 MP3 CD Player (Or any of the EXP series players)

I bought it, and returned it

It plays MP3's just fine, but playing AAC, it sucks

The audio voulme level is WAY too low!. It's a desigh flaw on all EXP series

Look at my post here in this thread, and the answer: http://www.hydrogenaudio.org/index.p...&st=25&hl=kwag

-kwag

Latexxx · #27 05-17-2003, 02:43 AM

Are there any other problems? Did the turning volume louder help?

kwag · #28 05-17-2003, 08:27 AM

Quote:

Originally Posted by Latexxx

Are there any other problems? Did the turning volume louder help?

With the volume turned up to the max, the AAC tracks sound about half the volume as the MP3 tracks, and it's not high enough. On WinAmp, both MP3 and AAC sound the same volume level. So the unit (and the Exp series ) definitely has a design flaw

-kwag