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Topic: QAAC "-q" setting (Read 5947 times) previous topic - next topic
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QAAC "-q" setting

Hi,

Could someone please help me understand what the "-q" setting in QAAC does? The documentation only describes it as "aac encoding quality", with no additional details. What does a value of 2 do compared to 0? How does it differ from a high or low value of the "-V" setting?

Thanks!

R.

QAAC "-q" setting

Reply #1 –
https://github.com/nu774/qaac/wiki/Encoder-configuration

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AAC output mode options take integer value (option argument) to specify bitrate or quality.  --tvbr  takes quality value between 0 to 127 (bigger result in better quality, larger file size).

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there exists an another option named  --quality  ( -q ), and you might be confused by this. Unlike bitrate or TVBR quality, this option controls not quality/size trade off but quality/speed trade off. Bigger value means higher quality (or smaller file size), and slower encoding speed. By default, qaac chooses  --quality 2 . Probably you don't have to touch this option unless you have a special reason to do so.

QAAC "-q" setting

Reply #2 –
I would say there's no case to use this option because even my old two core laptop can convert in real-time with Q2 and singe thread.
Maybe only very ancient computer like Intel Pentium but that wouldnot work anyway because CoreAudioToolbox using SSE.

QAAC "-q" setting

Reply #3 –
Thank you!