[x264-devel] x264 rc mode settings clarification

[Purvin Pandit]

I appreciate your response Kieran, but the original question is what is the effective "rate control mode" when different combination of these settings is used.
Here, let me post again my example again (but more generally I am trying to understand what the effect RC mode will be if any of this is changed):
1st pass:vbv-bufsize=10000 bitrate=3400 vbv-maxrate=3800 ratetol=0.1 -pass 12nd pass:everything same as above with -pass 2Is this going to be be CBR/VBR/ABR? Will if target a fixed file size or bitrate or both?
Thanks,-Purvin
Date: Mon, 12 May 2014 07:31:50 -0700
From: kieran at kunhya.com
To: x264-devel at videolan.org
Subject: Re: [x264-devel] x264 rc mode settings clarification

Vbv bufsize is the size of the leaky bucket. Vbv maxrate is the maximum input into said bucket. Leave ratetol alone. Bitrate is the average bitrate across the video.
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                            Purvin Pandit <purvinp at hotmail.com>;                            

                            
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                            x264-devel at videolan.org <x264-devel at videolan.org>;                                                                                                     

                            
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                            Re: [x264-devel] x264 rc mode settings clarification                            

                            
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                            Mon, May 12, 2014 12:48:04 PM                            

                        
                            

                            
                                
                                    
                                        Folks,Is this a very difficult question or a stupid question? No one on this list has answered it for while now. x264 is a fantastic piece of work but without understanding what all the different combinations will do its hard to use it. I would like to understand and document (if possible) what all the different combinations of the rate control settings (including VBV settings) do to the final encode.If someone knows of a place where all the different combinations of bitrate, max-bitrate, vbv-bufsize, vbv-maxrate, ratetol, pass, crf, vbv-init, crf-max are documented please let me know.Thanks,-PurvinFrom: purvinp at hotmail.comTo: x264-devel at videolan.orgDate: Fri, 9 May 2014 07:56:21 -0400Subject: Re: [x264-devel] x264 rc mode settings clarification


Reposting....


HiI have a question about the rate control settings in x264. What is the implication of using the following settings?1st pass:vbv-bufsize=10000 bitrate=3400 vbv-maxrate=3800 ratetol=0.1 -pass 12nd pass:everything same as above with -pass 2Is this going to be be CBR/VBR/ABR? Will if target a fixed file size or bitrate or both?Thanks I am just trying to get all the different parameters sorted
 out.Thanks,-Purvin 		 	   		  
 		 	   		  
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