[x264-devel] question regading encoded keyframe size at 720p

[Carl Petersen]

I certainly get totally different results with the only change being
setting f_rf_constant_max vs not touching that setting. If I set
f_rf_constant_max to 35 ; my crf is 24; I see the occasional downgrade in
quality but no artifacts or glitches or anything. However not setting
f_rf_constant_max, I get frequent grey bars across the bottom of the
screen at the keyframe instants.


-----Original Message-----
From: x264-devel [mailto:x264-devel-bounces at videolan.org] On Behalf Of
Henrik Gramner
Sent: Thursday, October 15, 2015 3:24 PM
To: Mailing list for x264 developers
Subject: Re: [x264-devel] question regading encoded keyframe size at 720p

On Thu, Oct 15, 2015 at 7:35 PM, Carl Petersen <cpetersen at broadsoft.com>
wrote:
> Thanks. Makes sense.
>
> If I set f_rf_constant_max, I can reduce keyframe size to honour a
> smaller vbv. If that is not set, how much is quality allowed to be
> reduced to try to honour vbv?
>
> In other words, in there a concept of a default value for
f_rf_constant_max?

VBV is by default allowed to reduce the quality as much as necessary to
hit the target.
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