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  • LigH
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QAAC: discussion, questions, feature requests, etc.
Reply #225
QAAC is only a user interface for the original Apple QuickTime AAC and ALAC encoders.
http://forum.gleitz.info - das deutsche doom9/Gleitz-Forum

  • Anakunda
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QAAC: discussion, questions, feature requests, etc.
Reply #226
Anu info about what;s new in CoreAudioCodec 7.9.8.1????

  • sluggy
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QAAC: discussion, questions, feature requests, etc.
Reply #227
Anu info about what;s new in CoreAudioCodec 7.9.8.1????


Id like to know also. I just checked to see if there was a quicktime update only to find the apple site says the latest is 7.7.1 where i have been using 7.7.2 for a while now??

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #228

  • sluggy
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QAAC: discussion, questions, feature requests, etc.
Reply #229
http://www.hydrogenaudio.org/forums/index....showtopic=96970


Thanks eahm, im still wondering why on the apple site the latest quicktime says 7.7.1 where 7.7.2 has been out for a while?

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #230
im still wondering why on the apple site the latest quicktime says 7.7.1 where 7.7.2 has been out for a while?

I was thinking the same yesterday, I guess 7.7.1 was the latest included with iTunes? Now you have to install it separately, no idea btw.
  • Last Edit: 13 September, 2012, 12:24:58 PM by eahm

  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #231
I cannot encode mono files to aac using qaac now .
The output is always stereo no matter what parameters I tried.
It even output an HE-AAC v2 file if i specify -he.

I've installed iTunes 10.7.0.21.

  • nu774
  • [*][*][*][*][*]
  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #232
I cannot encode mono files to aac using qaac now .
The output is always stereo no matter what parameters I tried.
It even output an HE-AAC v2 file if i specify -he.

Open with QuickTime Player->window menu->movie inspector.
Or, check with Mediainfo (install the latest version).
ffmpeg/libav seems to judge mono HE-AAC file generated by Apple encoder to be stereo.

  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #233
Itunes says so

http://postimage.org/image/n3e3k99yl/

So does foobar

http://postimage.org/image/t7as83wgn/

Anyway, seems that the result is the same when I do "Create AAC Version" within Itunes 10.7: it is encoded as he-aac v2 in stereo

  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #234
Seems that Itunes can keep it to mono if i encode as LE.
Encode as HE will make it HEv2 which is of course in stereo.

Encode as HE / LE in qaac both results in stereo.

  • nu774
  • [*][*][*][*][*]
  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #235
Encode as HE / LE in qaac both results in stereo.

Not reproducing here. The result of qaac is the same as iTunes.

It's funny that iTunes says mono HE-AAC files created by itself as stereo HE-AAC v2.
It actually is not HE-AAC v2 and not using any SBR extensions including PS. I confirmed this looking into bitstream (using debugger).
In this case, QuickTime player and Mediainfo are correct.

  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #236
Encode as HE / LE in qaac both results in stereo.

Not reproducing here. The result of qaac is the same as iTunes.

It's funny that iTunes says mono HE-AAC files created by itself as stereo HE-AAC v2.
It actually is not HE-AAC v2 and not using any SBR extensions including PS. I confirmed this looking into bitstream (using debugger).
In this case, QuickTime player and Mediainfo are correct.


Oh yeah, for the LC file, foobar says stereo and itunes / quicktime says mono. So the behaviour for qaac is consistent with itunes and any "issue" is that caused by itunes only.

I think quicktime actually always says he v2 files are mono: i tested one encoded with nero aac.

BTW, i notice that for the nero he v2 files: foobar says SBR+PS stereo
For the itunes he file (mono source), foobar says SBR stereo
  • Last Edit: 14 September, 2012, 08:47:50 AM by kevinsham

  • lvqcl
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  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #237
Your HE AAC file IS mono, the decoder just outputs upmixed stereo. This is because of parametric stereo, which is always signalled implicitly. Because of that, the decoder upmixes ALL mono files to stereo, even if there is no PS in the file.

Menno


  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #238
Your HE AAC file IS mono, the decoder just outputs upmixed stereo. This is because of parametric stereo, which is always signalled implicitly. Because of that, the decoder upmixes ALL mono files to stereo, even if there is no PS in the file.

Menno



What "decoder" is that quote referring to?

If Mediainfo is correct, all the below behaviors is wrong:
Itunes encoded LC file with mono source is reported as LC stereo in foobar.
Itunes encoded HE file with mono source is reported as HE stereo in foobar.
Itunes encoded HE file with mono source is reported as HEv2 stereo in Itunes.

In all 3 cases: the software actually decodes to 2 channels, as verified by their "convert to wav" output.

I think it is problem with foobar and itunes then.

  • kevinsham
  • [*]
QAAC: discussion, questions, feature requests, etc.
Reply #239
Your HE AAC file IS mono, the decoder just outputs upmixed stereo. This is because of parametric stereo, which is always signalled implicitly. Because of that, the decoder upmixes ALL mono files to stereo, even if there is no PS in the file.

Menno



What "decoder" is that quote referring to?

If Mediainfo is correct, all the below behaviors is wrong:
Itunes encoded LC file with mono source is reported as LC stereo in foobar.
Itunes encoded HE file with mono source is reported as HE stereo in foobar.
Itunes encoded HE file with mono source is reported as HEv2 stereo in Itunes.

In all 3 cases: the software actually decodes to 2 channels, as verified by their "convert to wav" output.

I think it is problem with foobar and itunes then.


The last test I am doing: Nero encoded HE(v1) with mono source:
Itunes reported as HEv2 stereo.

So seems that Itunes is just reporting any HE files as "v2" and try decoding as stereo.

Issues should be reported to iTunes and foobar than.

Thanks for all the prompt replies.
QAAC is a great tool.


  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #240
nu774, sorry I have to ask this, is there an option to remove the "Tool" tag while converting? I have few iOS projects and I would like to use Apple/TVBR for music files but I don't want to show how I converted them.

If not, could you create a new version with a "-notool" or similar option?

Thanks.
  • Last Edit: 20 September, 2012, 05:28:17 PM by eahm

  • nu774
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  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #241
If not, could you create a new version with a "-notool" or similar option?

It's technically possible, but looks too special to be implemented as a generic option.
Can't you just remove tool tag after encoding?

In case you don't know how to do it, try mp4tags(CLI app) of mp4v2 project: mp4v2 download page
The following command line will remove tool tag from foo.m4a.
Code: [Select]
mp4tags -rE foo.m4a

Currently only a deprecated pre-built binary for Windows is out there and probably it has issues on non-ascii text handling, but it will be enough for this rather simple usage.

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #242
mp4tags works perfectly.

An option on your CLI would be amazing for mass encoding without it but it's perfect for now.

Thanks.
  • Last Edit: 20 September, 2012, 10:04:29 PM by eahm

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #243
Code: [Select]
[qaac] release 1.42 (refalac 0.53)
posted 3 hours ago by nu 774

MP4 container minor fix: added "isom" to compatible brands.
Also I started a new project [url="https://github.com/nu774/cafmux"]cafmux[/url] at github, which is a simple command line audio remuxer using CoreAudioToolbox.


https://sites.google.com/site/qaacpage/cabinet

Thanks for the update.
  • Last Edit: 08 October, 2012, 01:44:33 PM by eahm

  • Anakunda
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QAAC: discussion, questions, feature requests, etc.
Reply #244
There's new version: https://sites.google.com/site/qaacpage/cabi...rects=0&d=1

Quote
Fixed passband of --rate (sample rate converter of libsoxrate). Regression on 1.40. Default passband was not properly set, and resulted in audibly muffled sound when you do --rate=32000 or something.
    Modified transition band width of --lowpass (was unnecessarily small).
    Support CAF tag reading (qaac only).

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #245
There's new version: https://sites.google.com/site/qaacpage/cabi...rects=0&d=1

Quote
Fixed passband of --rate (sample rate converter of libsoxrate). Regression on 1.40. Default passband was not properly set, and resulted in audibly muffled sound when you do --rate=32000 or something.
    Modified transition band width of --lowpass (was unnecessarily small).
    Support CAF tag reading (qaac only).


Yes but please link to the cabinet's url (https://sites.google.com/site/qaacpage/cabinet), people know what to download by their selves.
  • Last Edit: 17 October, 2012, 04:04:18 AM by eahm

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #246
Thanks for the 1.44 update and fixiTunSMPB. One question, why qtaacenc never needs updates?

  • nu774
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  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #247
Thanks for the 1.44 update and fixiTunSMPB. One question, why qtaacenc never needs updates?

Well, is that kind of a question I can answer? I don't know.
I'm sorry for long standing iTunSMPB problem, I didn't notice it until now since I'm a fb2k user, and nobody reported of it.

  • eahm
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QAAC: discussion, questions, feature requests, etc.
Reply #248
Don't qaac and qtaacenc use the same "engine"? Sorry I'm not a programmer.
  • Last Edit: 19 October, 2012, 11:58:11 AM by eahm

  • nu774
  • [*][*][*][*][*]
  • Developer
QAAC: discussion, questions, feature requests, etc.
Reply #249
Don't qaac and qtaacenc use the same "engine"? Sorry I'm not a programmer.

Yes, eventually same AAC encoder of Apple is used, but that's all.
These two are completely different programs written by different authors. For example, qaac doesn't use QuickTime at all.