[x264-devel] Constant QP with VBV

[Tsahi Gilk]

Hi,

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 tried to use -qp with -vbv-bufsize and -vbv-maxrate, but I get a warning "VBV is incompatible with constant QP, ignored."

I came across xsplit documation who claims to do with x264 exactly what I want to do:
"XSplit uses quality based encoding and sets a VBV-maxrate and VBV-buffer. This basically means that the x264 encoder in XSplit tries to maintain a constant quality of the stream and can use less bandwidth in less complex or less important scenes. The VBV-maxrate puts a ceiling to the bandwidth that encoder can use, but relative to the VBV-buffer. "

What are the proper parameter to achieve constant QP with VBV?

Thanks.

Tsahi.



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