[x264-devel] x264-devel Digest, Vol 113, Issue 6

[Raul Lopez]

Thanks, adding "--no-mbtree" to my command line allows x264 to choose a
single QP for the whole frame as reported by Elecard StreamEye Version 4.


On Wed, Oct 19, 2016 at 3:00 AM, <x264-devel-request at videolan.org> wrote:

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> Today's Topics:
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>    1. How can I disable Adaptive Quantization (AQ)      completely?
>       (Raul Lopez)
>    2. Re: How can I disable Adaptive Quantization (AQ)  completely?
>       (BugMaster)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 18 Oct 2016 17:20:46 -0700
> From: Raul Lopez <raulizahi at gmail.com>
> To: x264-devel at videolan.org
> Subject: [x264-devel] How can I disable Adaptive Quantization (AQ)
>         completely?
> Message-ID:
>         <CALu=swgAtVB6Ji4kf5p9RO1rPczk=n-Wzu_PFfLNPtmkTjk9LA at mail.
> gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Using x264 0.148.x built today, I was not able to completely disable AQ
> when I set "--aq-mode 0".
>
> I get a reduction in the range of QP in the Initial Intra Frame from 20-41
> (without the --aq-mode 0 option) to 27-36, so the parameter is doing
> something, but, for testing purposes, I would want to have a single QP for
> the whole frame that adapts to the content and is regulated by Rate
> Control.
>
> Does --aq-mode 0 not work or do I need to set any other parameter at the
> same time?
>
> This is my command line:
>
> x264 --preset fast --bframes 0 --bitrate 3000 --vbv-bufsize 3000
> --vbv-maxrate 3000 --nal-hrd cbr --fps 30 --keyint 100 --min-keyint 100
> --no-scenecut --aq-mode 0 --output
> sensor_3Mbps_CBR_VBV1Sec_IP_GOP100_noAdaptiveQP.h264
> sensor_1920x1080p30.mov
>
> Any guidance would be appreciated.
>
> Raul
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> ------------------------------
>
> Message: 2
> Date: Wed, 19 Oct 2016 09:34:59 +0300
> From: BugMaster <BugMaster at narod.ru>
> To: Mailing list for x264 developers <x264-devel at videolan.org>
> Subject: Re: [x264-devel] How can I disable Adaptive Quantization (AQ)
>         completely?
> Message-ID: <1277560981.20161019093459 at narod.ru>
> Content-Type: text/plain; charset=utf-8
>
> On Tue, 18 Oct 2016 17:20:46 -0700, Raul Lopez wrote:
> > Using x264 0.148.x built today, I was not able to completely
> > disable AQ when I set "--aq-mode 0".
>
> > I get a reduction in the range of QP in the Initial Intra Frame
> > from 20-41 (without the --aq-mode 0 option) to 27-36, so the
> > parameter is doing something, but, for testing purposes, I would
> > want to have a single QP for the whole frame that adapts to the
> > content and is regulated by Rate Control.
>
> > Does --aq-mode 0 not work or do I need to set any other parameter at the
> same time?
>
> > This is my command line:
>
> > x264 --preset fast --bframes 0 --bitrate 3000 --vbv-bufsize 3000
> > --vbv-maxrate 3000 --nal-hrd cbr --fps 30 --keyint 100 --min-keyint
> > 100 --no-scenecut --aq-mode 0 --output
> > sensor_3Mbps_CBR_VBV1Sec_IP_GOP100_noAdaptiveQP.h264
> sensor_1920x1080p30.mov
>
> > Any guidance would be appreciated.
>
> > Raul
>
> Hi. "--aq-mode 0" disables AQ only but there other algorithms that
> change QP at macroblock level like MBTree and VBV (row level). So if
> you really want only single QP for full frame than you need to disable
> them also i.e. --no-mbtree and don't use vbv options.
>
>
>
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> ------------------------------
>
> End of x264-devel Digest, Vol 113, Issue 6
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