x264 rate control modes

xxxyyyzzzz · 4th September 2013, 03:34

Recently I am reading the x264 source codes. Mostly, I concern the RC part. And I am confused about the parameters --bitrate and --vbv-maxrate. When bitrate is set, the CBR mode is used in frame level. If you want to start the MB level RC, the parameters bitrate, vbv-maxrate and vbv-bufsize should be set. But I don't know the relationship between bitrate and vbv-maxrate.
What is the criterion of the real encoding result when bitrate and vbv-maxrate are both set?
And what is the recommended value for bitrate? Equals to vbv-maxrate?
Also what is the recommended value for vbv-bufsize? Half of vbv-maxrate? Please give me some advice.

4th September 2013, 03:34	#1 \| Link
xxxyyyzzzz Registered User Join Date: Mar 2011 Posts: 5	x264 rate control modes Recently I am reading the x264 source codes. Mostly, I concern the RC part. And I am confused about the parameters --bitrate and --vbv-maxrate. When bitrate is set, the CBR mode is used in frame level. If you want to start the MB level RC, the parameters bitrate, vbv-maxrate and vbv-bufsize should be set. But I don't know the relationship between bitrate and vbv-maxrate. What is the criterion of the real encoding result when bitrate and vbv-maxrate are both set? And what is the recommended value for bitrate? Equals to vbv-maxrate? Also what is the recommended value for vbv-bufsize? Half of vbv-maxrate? Please give me some advice.