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Quicktime pro resampler quality?
Mix3dmessagez
post Mar 28 2012, 20:23
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I use quicktime to downsample needledrops to 48hz tvbr *for ipod use*
I've also come across foobar sox resampler which I've read is the best
I've tried to do comparisons *downsample with sox to 48000hz then convert with quicktime or convert using quicktime*
Usually the bitrates will be the same *on average* however sometimes sox downsamples will be one bit higher *on average*
I've tried to look at the individual bitrates for the first few seconds of each song *Just to see if there's a conclusive difference* and they seem to handle things quit differently, I notice the bitrate changes faster when downsampled with sox, I know that probably isn't a determinant as to quality, but it's all I know
With sox I use very high, 48000hz, 95% passband, allow aliasing, 25% phase response *someone at another forum said those are best settings*
On quicktime, best quality, variable bit rate, and recommended sample rate
I also want to know as if Sox is better I can resample all needledrops to 48hz flac *from 96 to save space*
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nu774
post Apr 12 2012, 06:49
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Ah, I've forgotten one thing:
You will need "--rate 44100" or something to specify target sample rate, if you want to test sample rate conversion!
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Mix3dmessagez
post Apr 12 2012, 06:56
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QUOTE (nu774 @ Apr 12 2012, 01:49) *
Ah, I've forgotten one thing:
You will need "--rate 44100" or something to specify target sample rate, if you want to test sample rate conversion!


1 out of 1 tracks converted with major problems.

Source: "C:\Users\******\Downloads\Kid Cudi - Man on the Moon II- The Legend of Mr Rager [Vinyl][FLAC]\11 MANIAC.flac"
An error occurred while writing to file (The encoder has terminated prematurely with code 1 (0x00000001); please re-check parameters) : "C:\Users\*******\Desktop\alac\11. MANIAC (feat. Cage & St. Vincent).mp4"
Additional information:
Encoder stream format: 96000Hz / 2ch / 16bps
Command line: "C:\Users\P*******\Desktop\desktop\qaac_1.31\x86\qaac.exe" -V 127 --rate 48000 --native-resampler=bats,127 - -o "11. MANIAC (feat. Cage & St. Vincent).mp4"
Working folder: C:\Users\******\alac\

Conversion failed: The encoder has terminated prematurely with code 1 (0x00000001); please re-check parameters

Am I doing something wrong?

heres a pic



This post has been edited by Mix3dmessagez: Apr 12 2012, 07:22
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nu774
post Apr 12 2012, 07:25
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QUOTE (Mix3dmessagez @ Apr 12 2012, 14:56) *
Command line: "C:\Users\P*******\Desktop\desktop\qaac_1.31\x86\qaac.exe" -V 127 --rate 48000 --

Please upgrade to 1.35 if you are running 1.31.
--native-resampler was updated very recently.
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Mix3dmessagez
post Apr 12 2012, 07:39
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thanks, solved my issue!last problem though, I'm gettign bitrates of 200-300's
here's what it says in tools
qaac 1.35, CoreAudioToolbox 7.9.7.9, AAC-LC Encoder, TVBR q127, Quality 96

i want quicktime best vbr but in its quicktime present mode

Ok, i checked some other threads and found that 64 produces similar results as quicktime, but the file is slightly smaller and the bitrates are different *in certain places although it gives the same avg bitrate in foobar*, does that mean its not the exact setting quicktime uses?

Also, I know I might be stretching it, but can I have my needledrops in 24 bit now too *or is that redundant with quicktime* *nevermind read in another thread it serves no purpose for aac*

This post has been edited by db1989: Apr 12 2012, 09:33
Reason for edit: as above
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nu774
post Apr 12 2012, 08:09
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QUOTE
want quicktime best vbr but in its quicktime present mode

I don't get it; What do you mean by this?
As far as I know, QuickTime pro for Windows allows you to choose not-constrained true VBR mode, but doesn't let you configure VBR quality. Therefore, practically you had better be using constrained VBR on QT pro.
(Actually, you can always stick to CVBR... which has been used by iTunes, and showed slightly better result on HA listening test)

You can configure "quality" from QuickTime GUI, but actually it's a different parameter, which corresponds to -q option of qaac.
This parameter is not for controlling size/quality trade off. It just controls complexity of encoding process, and simply higher is better... as long as encoding speed is acceptable for you.
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Mix3dmessagez
post Apr 12 2012, 08:37
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I'm sorry for being unspecific.I'll try to better translate my gibberish LOL

In QT, i choose best quality, variable bit rate encoding strategy and sound quality recommended *only choice*
I wanted settings that reflected this choice in qaac
From what i understand it tries to be as transparent as possible around 128 bit aac.
While qt didn't let you configure quality, it gave quality control of like 4 different options.These from what I remember, affected sound quality and changed the bitrates around differently.

I see about the -q option, but from what i read in your faq by default the best is chosen *-q2*
I tried to reproduce the closest settings to quicktimes files, but am getting slighty different bitrates *although same average as whole*, and filesizes
I appreciate your program and don't want to come off as a jack a i just want to input settings that will give me exactly what quicktime will, with the best resampler

This post has been edited by db1989: Apr 12 2012, 09:33
Reason for edit: as above
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nu774
post Apr 12 2012, 09:45
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Well, it's interesting. Quickly tried now QT pro 7.7.1 for Win with a few configuration parameters, and I also couldn't get identical result between QT pro and qaac. Same for CVBR.
On the other hand, I could confirm iTunes plus is still bit-identical with qaac --cvbr 256 -q2, and iTunes custom (CVBR) is identical with qaac --cvbr -q1;

qaac is now built directly upon CoreAudioToolbox, and is not using QuickTime API.
QT pro might be doing something different... I don't know for sure.
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Mix3dmessagez
post Apr 12 2012, 21:55
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QUOTE (nu774 @ Apr 12 2012, 04:45) *
Well, it's interesting. Quickly tried now QT pro 7.7.1 for Win with a few configuration parameters, and I also couldn't get identical result between QT pro and qaac. Same for CVBR.
On the other hand, I could confirm iTunes plus is still bit-identical with qaac --cvbr 256 -q2, and iTunes custom (CVBR) is identical with qaac --cvbr -q1;

qaac is now built directly upon CoreAudioToolbox, and is not using QuickTime API.
QT pro might be doing something different... I don't know for sure.


Hey, thanks for your response, I think I will just convert to alac and downsample using coreaudio now.One question though, on http://src.infinitewave.ca/ which core audio is present in the windows version?I see leopord and tiger, but I believe those are the mac versions.
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Posts in this topic
- Mix3dmessagez   Quicktime pro resampler quality?   Mar 28 2012, 20:23
- - DVDdoug   QUOTE *someone at another forum said those are bes...   Mar 28 2012, 20:48
- - IgorC   http://src.infinitewave.ca/ has Apple resampler i...   Mar 28 2012, 21:20
- - Mix3dmessagez   QUOTE (DVDdoug @ Mar 28 2012, 15:48) [gia...   Mar 28 2012, 22:27
|- - saratoga   QUOTE (Mix3dmessagez @ Mar 28 2012, 17:27...   Mar 28 2012, 23:19
|- - Mix3dmessagez   But what if the source material is digital and pre...   Mar 28 2012, 23:29
|- - saratoga   To be clear, I'm saying that the process of cr...   Mar 28 2012, 23:31
- - nu774   If you are using MacOS X, you can try afconvert (C...   Mar 29 2012, 05:05
- - SebastianG   I don't know about how well Quicktime does res...   Mar 29 2012, 10:35
- - Wombat   QUOTE (SebastianG @ Mar 29 2012, 10:35) T...   Mar 29 2012, 16:58
- - Wombat   I hope it is of some help. I did some simple examp...   Mar 31 2012, 03:15
- - Mix3dmessagez   QUOTE (nu774 @ Mar 29 2012, 00:05) If you...   Apr 12 2012, 01:40
|- - nu774   If you are interested, now qaac lets you play arou...   Apr 12 2012, 03:26
- - Wombat   If there really someone was interested in listenin...   Apr 12 2012, 02:14
- - Mix3dmessagez   QUOTE (Wombat @ Apr 11 2012, 21:14) If th...   Apr 12 2012, 04:23
|- - nu774   Try something like the following QUOTE -V 127 --na...   Apr 12 2012, 05:08
|- - Mix3dmessagez   Hi, thank you so much!I see you are the creato...   Apr 12 2012, 05:35
|- - nu774   Still getting errors? See what foobar2000 says on ...   Apr 12 2012, 06:41
- - nu774   Ah, I've forgotten one thing: You will need ...   Apr 12 2012, 06:49
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 12 2012, 01:49) Ah, I...   Apr 12 2012, 06:56
|- - nu774   QUOTE (Mix3dmessagez @ Apr 12 2012, 14:56...   Apr 12 2012, 07:25
|- - Mix3dmessagez   thanks, solved my issue!last problem though, I...   Apr 12 2012, 07:39
|- - nu774   QUOTE want quicktime best vbr but in its quicktime...   Apr 12 2012, 08:09
|- - Mix3dmessagez   I'm sorry for being unspecific.I'll try to...   Apr 12 2012, 08:37
|- - nu774   Well, it's interesting. Quickly tried now QT p...   Apr 12 2012, 09:45
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 12 2012, 04:45) Well, ...   Apr 12 2012, 21:55
|- - nu774   QUOTE (Mix3dmessagez @ Apr 13 2012, 05:55...   Apr 13 2012, 02:31
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 12 2012, 21:31) QUOTE ...   Apr 13 2012, 02:50
|- - nu774   QUOTE (Mix3dmessagez @ Apr 13 2012, 10:50...   Apr 13 2012, 04:53
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 12 2012, 23:53) QUOTE ...   Apr 13 2012, 05:37
|- - nu774   QUOTE (Mix3dmessagez @ Apr 13 2012, 13:37...   Apr 13 2012, 07:11
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 13 2012, 02:11) QUOTE ...   Apr 13 2012, 07:23
|- - nu774   QUOTE (Mix3dmessagez @ Apr 13 2012, 15:23...   Apr 13 2012, 08:07
|- - Mix3dmessagez   QUOTE (nu774 @ Apr 13 2012, 03:07) QUOTE ...   Apr 13 2012, 09:14
|- - IgorC   QUOTE (Mix3dmessagez @ Apr 13 2012, 05:14...   Apr 13 2012, 16:44
- - Wombat   Better ask on some audiophile forum for an abx of ...   Apr 13 2012, 14:06


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