[x264-devel] how does the qscale estimation works?

[shauli rozen]

Hi all . I am digging into the code and need some help :)

I am trying to figure out the way the x264 estimate the next qscale to use.
in the function rate_estimate_qscale ,  the variable last_satd is set using
: x264_rc_analyse_slice , and the
result seems to be estimated number of bits to encode the residual of the
frame.

Am I correct?
Also I would really appreciate any knowledge of the
way  x264_rc_analyse_slice works , how does it estimate
bit usage without knowing the qscale that will be used for the frame?

thanks a head
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