HydrogenAudio

Lossy Audio Compression => AAC => AAC - General => Topic started by: includemeout on 2020-07-18 11:49:16

Title: QAAC recommended settings
Post by: includemeout on 2020-07-18 11:49:16
Since the last public test took place in 2015-ish, I wonder whether the "winning" settings have been published anywhere, as I can't seem to find them both in the wiki (https://wiki.hydrogenaud.io/index.php?title=Apple_AAC) and in here.

I'm specifically after the recommended "standard" settings, so as to speak, for transparency. (it's somewhere around 128kpbs, right?)

Title: Re: QAAC recommended settings
Post by: samidare1234 on 2020-07-19 12:07:46

I would recommend tvbr(AAC True VBR) mode.

For the highest quality is

Code: [Select]
qaac64 -V 127

And if you want your media has the same base volume.

Code: [Select]
qaac64 --normalize -V 127

For the transparency, above 128kbps should be OK
128k-a128 -q1
iTunes Plus Quality(256k)-v256 -q2
As Reference
https://translate.google.com/translate?hl=en&sl=ja&tl=en&u=https%3A%2F%2Fkamedo2.hatenablog.jp%2Fentry%2F20130625%2F1372177052
Title: Re: QAAC recommended settings
Post by: includemeout on 2020-07-19 16:22:08
Thanks a lot!

But I must confess I still have two questions though:

Those settings aren't based on your own personal experience alone, are they?  I reckon I've seen them elsewhere on HA, but, with the QAAC wiki entry lacking such info, plus the absence of any sticker about it in this forum, I just wasn't quite sure whether they were some sort of "standard preset" or not.

My current ignorance about QAAC is solely due to my having settled down to using the Nero - not many questions asked then -  whenever AAC encoding was necessary (at hiatuses during my more frequent MP3, MPC or Wavpack lossy encoding), and now I'm wondering what difference QAAC could make to my lossy encoding - which takes us to my last question:

Which one is the best at encoding efficiency ATM? TVBR or CVBR?
Title: Re: QAAC recommended settings
Post by: samidare1234 on 2020-07-19 18:56:00
Thanks a lot!

But I must confess I still have two questions though:

Those settings aren't based on your own personal experience alone, are they?  I reckon I've seen them elsewhere on HA, but, with the QAAC wiki entry lacking such info, plus the absence of any sticker about it in this forum, I just wasn't quite sure whether they were some sort of "standard preset" or not.

My current ignorance about QAAC is solely due to my having settled down to using the Nero - not many questions asked then -  whenever AAC encoding was necessary (at hiatuses during my more frequent MP3, MPC or Wavpack lossy encoding), and now I'm wondering what difference QAAC could make to my lossy encoding - which takes us to my last question:

Which one is the best at encoding efficiency ATM? TVBR or CVBR?

For QAAC it should be VBR>ABR>CBR. Because the encoder can allocate bit rate according to complexity.
In QAAC ,-tvbr 127 has the average bitrate higher than 320, So I would say it is the best quality. 
For some other format like mp3(LAME), because the maxium bitrate is 320 so the CBR 320kbps is the best quality.

https://hydrogenaud.io/index.php/topic,104234.msg855350.html#msg855350
Title: Re: QAAC recommended settings
Post by: includemeout on 2020-07-19 19:39:28
For QAAC it should be VBR>ABR>CBR. Because the encoder can allocate bit rate according to complexity.
In QAAC ,-tvbr 127 has the average bitrate higher than 320, So I would say it is the best quality. 
 
That's very helpful. Thank you again!

For some other format like mp3(LAME), because the maxium bitrate is 320 so the CBR 320kbps is the best quality.

https://hydrogenaud.io/index.php/topic,104234.msg855350.html#msg855350
 
 Yeah, I'm aware of that standard's particular specification. :))

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