[x264-devel] Constant QP with VBV

[Tsahi Gilk]

How can I know the quality of each encoded frame?
Can I get it from x264 API?

Tsahi.

-----Original Message-----
From: x264-devel-bounces at videolan.org [mailto:x264-devel-bounces at videolan.org] On Behalf Of Jason Garrett-Glaser
Sent: Sunday, February 12, 2012 6:38 PM
To: Mailing list for x264 developers
Subject: Re: [x264-devel] Constant QP with VBV

> I came across xsplit documation who claims to do with x264 exactly 
> what I want to do:

Where in that does it say the word "QP"?  I certainly don't see it.

> I want to encode videos with constant QP and maximum frame size. I 
> don't care about average bitrate. CRF does not meet the target QP I requested.

I do not see the purpose of a "target QP" outside of encoder testing.
--qp is a developer-option only and should never be used for any serious purpose, with the exception of --qp 0 (lossless).  Constant QP is not constant quality and should [almost] never be used.

What Xsplit does, and what is recommended, is --crf + VBV.

Jason
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