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Topic: new in aac what should i do to get cd quality (Read 27408 times) previous topic - next topic
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new in aac what should i do to get cd quality

Reply #50 –
Quote from: Neasden on
Nero q 0.75 (~300 kbps). I wonder if you guys hear the cymbals and drums smearing issues you talk about with this Nero setting, taking into account that LAME -V0 is not enough in some cases...


The AAC standard has some extra tools compared to MP3, and different sizes of the long/short blocks which reduce the pre-echo effect, which translates in the smearing that you talk about.

In other words, it is not the bitrate the one that makes this possible.

new in aac what should i do to get cd quality

Reply #51 –
Quote
' date='Oct 6 2008, 19:55' post='591995']
Quote from: Neasden on
Nero q 0.75 (~300 kbps). I wonder if you guys hear the cymbals and drums smearing issues you talk about with this Nero setting, taking into account that LAME -V0 is not enough in some cases...

The AAC standard has some extra tools compared to MP3, and different sizes of the long/short blocks which reduce the pre-echo effect, which translates in the smearing that you talk about.

In other words, it is not the bitrate the one that makes this possible.

That "eig" sample, is a good example that even higher bitrates struggles.

Speaking of high bitrates, i brought Trivium's new album today and for some reason i could ABX one of the tracks at V2 and V0 

LAME 3.97 -V0 --vbr-new

Code: [Select]
foo_abx 1.3.3 report
foobar2000 v0.9.5.5
2008/10/06 22:27:58

File A: C:\Rips\Trivium - Shogun\10. Like Callisto To A In Heaven.flac
File B: C:\Temp\q 55\Trivium - Shogun\10. Like Callisto To A In Heaven.mp3

22:27:58 : Test started.
22:28:13 : 01/01  50.0%
22:28:23 : 02/02  25.0%
22:28:31 : 03/03  12.5%
22:28:37 : 04/04  6.3%
22:28:44 : 05/05  3.1%
22:28:52 : 06/06  1.6%
22:28:57 : 07/07  0.8%
22:29:05 : 08/08  0.4%
22:29:09 : 09/09  0.2%
22:29:25 : 10/10  0.1%
22:29:32 : 11/11  0.0%
22:29:42 : 12/12  0.0%
22:29:57 : 13/13  0.0%
22:30:02 : 14/14  0.0%
22:30:06 : 15/15  0.0%
22:30:50 : Test finished.

 ---------- 
Total: 15/15 (0.0%)

For some reason the first few secends with the drum sounds abit odd. Also at V2, there is warbling on the guitar at around 0:13.

I also did the test again to make sure that am not going insane  . Also please ignore the subfolder name, i forgot to select my V0 encode folder when i was transcoding from flac to v0.

Code: [Select]
foo_abx 1.3.3 report
foobar2000 v0.9.5.5
2008/10/06 22:45:08

File A: C:\Rips\Trivium - Shogun\10. Like Callisto To A In Heaven.flac
File B: C:\Temp\q 55\Trivium - Shogun\10. Like Callisto To A In Heaven.mp3

22:45:08 : Test started.
22:45:27 : 01/01  50.0%
22:45:39 : 02/02  25.0%
22:45:50 : 03/03  12.5%
22:45:57 : 04/04  6.3%
22:46:05 : 05/05  3.1%
22:46:16 : 06/06  1.6%
22:46:35 : 07/07  0.8%
22:46:46 : 08/08  0.4%
22:46:57 : 09/09  0.2%
22:47:02 : 10/10  0.1%
22:47:10 : 11/11  0.0%
22:47:16 : 12/12  0.0%
22:47:29 : Test finished.

 ---------- 
Total: 12/12 (0.0%)

The first few secends do still sound odd on the drums. Also this file weighs at 295kbps  and still not transparent.

I really don't get it, i got mediocre audio hardware. I only got a Soundblaster Audigy SE and pair of Sennheiser HD 215 headphones.
"I never thought I'd see this much candy in one mission!"

new in aac what should i do to get cd quality

Reply #52 –
Hm... really interesting... I never understood why Vorbis never became the defacto standard lossy codec... Can I ask, using RockBox in iPod Classic Video, how many hours of battery does one have when playing Vorbis?

new in aac what should i do to get cd quality

Reply #53 –
Quote from: Neasden on
Hm... really interesting... I never understood why Vorbis never became the defacto standard lossy codec... Can I ask, using RockBox in iPod Classic Video, how many hours of battery does one have when playing Vorbis?

You can not install RockBox on a iPod Classic am afraid. Since Apple has encrypted the firmware on all lastest iPods since they are becoming the next M$. You will need a old 5g iPod video or a 1g iPod to run RockBox.

Anyway Vorbis might struggle on certain tracks that might be transparent on another codec at the same bitrate. Like those MPC files I ABX, they are transparent to me on Ogg at q 5.5 and LAME at V2; but some tracks might suck at LAME V2 and would sound fine on MPC. But I am shocked that MPC --standard could be so easy to ABX, since alot of Musepack users swear its fully transparent at standard.

As for me ABXing that track at V0, hopefully i might not be able to ABX it again; I recken i got temporary sensitve to something, after ABXing it at V2.
"I never thought I'd see this much candy in one mission!"

new in aac what should i do to get cd quality

Reply #54 –
isn't RockBox available for iPod Video Classic 80GB, according to their site?

(I just realized that there is a iPod Video 80GB that may not be labelled Classic, or are they the same?)

new in aac what should i do to get cd quality

Reply #55 –
A iPod Video Classic 80GB is a capacity that was once offered for the iPod Classic last year.  That was when the model was available in two capacities: 80GB and 160GB.  It is now only available in 120GB though.  A 80GB iPod Classic is not the same thing as the older 80GB iPod model.  That was known as the 5.5G 80GB iPod and runs completely different software (along with some different hardware) than the newer 80GB iPod classic.

new in aac what should i do to get cd quality

Reply #56 –
Quote from: Neasden on
isn't RockBox available for iPod Video Classic 80GB, according to their site?

(I just realized that there is a iPod Video 80GB that may not be labelled Classic, or are they the same?)

From the site "Apple: 1st through 5.5th generation iPod, iPod Mini and 1st generation iPod Nano
(not the Shuffle, 2nd/3rd gen Nano, Classic or Touch)". There was a 80gb Video (5.5g) which has different hardware then the Classic and had better UI and firmware support IMO.

I had my Classic for a year now, and the firmware was just plain buggy since day 1, all the problems i had with it have gone though with the latest firmware. Its just for some reason with my Classic i get a impression that Apple has lost alot of interest on the HD based iPods. I wish there was a HD based iPod Touch, though  .
"I never thought I'd see this much candy in one mission!"

new in aac what should i do to get cd quality

Reply #57 –
is there a aac (mp4) dll encoder to put inside to eac or cdex?

or an acm , i mean to install in the xp codec?

new in aac what should i do to get cd quality

Reply #58 –
in my point of view seems that nero mp4 sounds better then easy cd extractor mp4 encoder in the Ipod

new in aac what should i do to get cd quality

Reply #59 –
Quote from: menno on
Quote from: memomai on

Quote
I will check this out. Did you rename your Nero encoded files to have the m4a extension? Is it a 1st or 2nd generation Shuffle?


2nd gen & m4a extension using latest itunes firmware.


HE AAC files are indeed reported twice too long in iTunes. It seems they use the audio samplerate instead of the timescale to calculate the length. I'll see if we can work around this in a next version, but it might give all kinds of other problems. I'm guessing the fact that you use HE AAC is also the reason why your shuffle refuses to play the files.
When you use iTunes or iPod, never use HE AAC, use the -lc switch to force LC AAC output. The "HE" part will not be decoded by the iPod or iTunes anyway.


It turns out the file length issue is a problem in iTunes, it assumes files with the M4A extension have 1024 samples per frame (which HE AAC files don't have). No way to work around that without breaking every other player. Rename the files to have the MP4 extension and iTunes reports the length correctly.

new in aac what should i do to get cd quality

Reply #60 –
My 2 cents:

as ppl have mentioned previously, snare and crisp drum sounds sound a little better. I switched from Lame 3.97 v2 last year to nero aac, and one thing that I did notice was high snare sounds sound a little crisper, though it is very subtle.

I personally use 0.45 of whatever the latest Nero encoder is. files are smaller than lame mp3 v2, sound about the same if not better (haven't noticed any artifacts so far and even if there are any they're rare enough that it's a non-concern), and I'm not worried about compatibility since it's an ipod world and every player that I conceivably see myself using in the future (including rockbox) have aac support.

I use foobar to convert. The biggest benefit is that you can change the file extension in the converter from .mp4 to .m4a (needed for the ipod classic). Works beautifully on the ipod classic.

Another benefit to using the aac encoder is that you can rip audiobooks from cd to a single .m4b file. Actually, I have noticed issues with the nero encoder with creating huge audiobook files using .20. Late in the file there seem to be issues of some weird corruption...