Possible AQ bug

Chabb · 12th June 2008, 14:40

Is it a bug or a feature that in builds since 861
AQ is out, which is noticeable when comparing filesizes and in files too:

x264 - core 59 r861 7331ea4 ... pb_ratio=1.30 aq=2:2.00
x264 - core 60 r881 e098505 ... pb_ratio=1.30 aq=0

Changing aq-mode and aq-strength gives no effect.

Dark Shikari · 12th June 2008, 14:54

Stop using CQP mode.

Constant Quantizer does indeed mean constant, so AQ is auto-disabled when using it.

Chabb · 12th June 2008, 15:21

Sorry, my bad.
So what are you propose me to use: CRF or 2-pass

By the way, is there fractional CRF values available again?

LoRd_MuldeR · 12th June 2008, 15:30

Quote:

Originally Posted by Chabb

So what are you propose me to use: CRF or 2-pass

Depends on what you want to achieve!

If you want to get a certain level of quality, find out which CRF value satisfies your eyes and use that value for all encodes.
And if you want to get the maximum quality for a given filesize (or average bitrate), then use the 2-Pass mode.

Quote:

Originally Posted by Chabb

By the way, is there fractional CRF values available again?

Yes, I think so.

foxyshadis · 12th June 2008, 21:19

If you use CQ already, you can probably switch to a CRF of the same value and notice no obvious quality difference, though filesize will go down (with no AQ, with AQ anything can happen).

12th June 2008, 14:40	#1 \| Link
Chabb Registered User Join Date: Jun 2007 Location: Ukraine Posts: 32	Possible AQ bug Is it a bug or a feature that in builds since 861 AQ is out, which is noticeable when comparing filesizes and in files too: x264 - core 59 r861 7331ea4 ... pb_ratio=1.30 aq=2:2.00 x264 - core 60 r881 e098505 ... pb_ratio=1.30 aq=0 Changing aq-mode and aq-strength gives no effect.

12th June 2008, 14:54	#2 \| Link
Dark Shikari x264 developer Join Date: Sep 2005 Posts: 8,666	Stop using CQP mode. Constant Quantizer does indeed mean constant, so AQ is auto-disabled when using it. __________________ Follow x264 development progress \| akupenguin quotes \| x264 git status ffmpeg and x264-related consulting/coding contracts \| Doom10

12th June 2008, 15:21	#3 \| Link
Chabb Registered User Join Date: Jun 2007 Location: Ukraine Posts: 32	Sorry, my bad. So what are you propose me to use: CRF or 2-pass By the way, is there fractional CRF values available again? Last edited by Chabb; 12th June 2008 at 15:27.

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12th June 2008, 21:19	#5 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,559	If you use CQ already, you can probably switch to a CRF of the same value and notice no obvious quality difference, though filesize will go down (with no AQ, with AQ anything can happen).