Why shoud the vbv-related parameters be used in the MB Rate Control in X264?

xkfz007 · 13th November 2013, 03:53

In the ABR RC mode of x264, we just need give the parameter --bitrate, and this is Frame Level Rate control. But when I want to use the MB Level RC (not MB-tree), I have to give the parameters of vbv-bufsize and vbv-maxrate. I can't understand why? Is it impossible to use the MB Level RC with just the parameter --bitrate and HOW?
Can anyone give me some hints or explanation or whatever?

13th November 2013, 03:53	#1 \| Link
xkfz007 Registered User Join Date: Sep 2013 Posts: 38	Why shoud the vbv-related parameters be used in the MB Rate Control in X264? In the ABR RC mode of x264, we just need give the parameter --bitrate, and this is Frame Level Rate control. But when I want to use the MB Level RC (not MB-tree), I have to give the parameters of vbv-bufsize and vbv-maxrate. I can't understand why? Is it impossible to use the MB Level RC with just the parameter --bitrate and HOW? Can anyone give me some hints or explanation or whatever?

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