[x264-devel] Wrong reply

[雾卡]

I think you have sent the wrong reply to me，that's not my questions。My original letter is:
  
I am doing study on the Rate Control of Macroblock level based on X264, I have read some documents of this aspect, but there exists some questions, I need your help to make these clear:
 
1、Dose X264 supports the Macroblock level Rate Control?
 
2、If it supports, Is it right I choose the VBV(the same as CBR?)mode? And only VBV mode support the Macroblock layer rate control ,What about other modes?
3、If VBV allows macroblock layer RC, how should I set the command line parameter about the Rate Control, must I set the following parameters, and how to?
 
-B/--bitrate ,--vbv-maxrate ,--vbv-bufsize ,--vbv-init
 
 
 
Look forward to your early reply. So appreciate!
 
sincerely yours
 
 
 
Jane

   
  
  ------------------ Original ------------------
  From:  "BugMaster"<BugMaster at narod.ru>;
 Date:  Mon, Mar 7, 2011 04:08 PM
 To:  "Mailing list for x264 developers"<x264-devel at videolan.org>; 
 
 Subject:  Re: [x264-devel] About --sar option

  
On Sun, 6 Mar 2011 15:39:33 +0100, Davide Bergamini wrote:
> Hi, thanks for your work!
> I have a couple of question/suggestion about the --sar option.
> I think the real meaning of this option is not sar (storage aspect
> ratio), but its par (pixel aspect ratio)
> and it should be renamed "--input-par". (like --input-res)
> Example: a pal dvd mpeg2 widescreen
> sar = 5:4 (its the pixel resolution ratio 720/576)
> dar = 16:9 (its the output ratio)
> par = 64:45 (its the single pixel width/height ratio)
>  
>  

Hi. SAR acronym is not for storage aspect ratio, but for sample aspect
ratio. And yes sample aspect ratio has almost the same meaning as
pixel aspect ratio, but we use sample aspect ratio because this is the
name used in official H.264 specs.

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