[x264-devel] gop (BugMaster)

[mm1201 at mail.ustc.edu.cn]

Thanks for your help,the first one is just what I want and sorry for replying late.^@^


> -----原始邮件-----
> 发件人: x264-devel-request at videolan.org
> 发送时间: 2014-12-05 19:00:02 (星期五)
> 收件人: x264-devel at videolan.org
> 抄送: 
> 主题: [SPAM] x264-devel Digest, Vol 91, Issue 3
> 
> Send x264-devel mailing list submissions to
> 	x264-devel at videolan.org
> 
> To subscribe or unsubscribe via the World Wide Web, visit
> 	https://mailman.videolan.org/listinfo/x264-devel
> or, via email, send a message with subject or body 'help' to
> 	x264-devel-request at videolan.org
> 
> You can reach the person managing the list at
> 	x264-devel-owner at videolan.org
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of x264-devel digest..."
> 
> 
> Today's Topics:
> 
>    1. Re: gop (BugMaster)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 4 Dec 2014 22:47:39 +0300
> From: BugMaster <BugMaster at narod.ru>
> To: Mailing list for x264 developers <x264-devel at videolan.org>
> Subject: Re: [x264-devel] gop
> Message-ID: <1269177977.20141204224739 at narod.ru>
> Content-Type: text/plain; charset=us-ascii
> 
> On Thu, 4 Dec 2014 15:35:58 +0800 (GMT+08:00), mm1201 at mail.ustc.edu.cn wrote:
> > What is the api to set gop? 
> 
> Not fully understand what exactly in GOP you want to configure but
> here are options that can be relevant:
> 1) param.i_keyint_max (--keyint cli option) to set *maximum* interval
> between key-frames (IDR-frames for closed GOP);
> 2) param.i_scenecut_threshold (--scenecut / --no-scenecut cli options)
> to configure sensitivity of scenecut detection algorithm which can
> insert key-frame earlier than param.i_keyint_max so fixed key-frame
> interval you may want to set it to zero;
> 3) param.i_bframe (--bframes cli option) to set *maximum* number of
> *consecutive* B-frames;
> 4) param.i_bframe_adaptive (--b-adapt cli option) to choose algorithm
> which decide when and how many B-frames to insert so fixed B-frame
> pattern you may want to set it to X264_B_ADAPT_NONE (than it would
> always use param.i_bframe consecutive B-frames if it not violate
> key-frames placement);
> 5) param.i_bframe_pyramid (--b-pyramid cli option) if you need
> references B-frames (x264 choose middle B-frame in consecutive
> sequence to be referenced);
> 6) param.b_open_gop (--open-gop cli option) if you need open GOP;
> 
> 7) pic_in.i_type (cli set them according to --qpfile option) to force
> type of specific frame (can't violate param.i_keyint_max or
> param.i_bframe limits).
> 
> For example, fixed IbBbPbBbPbBbPIbBbPbBbPbBbPI... presentation order
> pattern will be:
> param.i_keyint_max = 13;
> param.i_scenecut_threshold = 0;
> param.i_bframe = 3;
> param.i_bframe_adaptive = X264_B_ADAPT_NONE;
> param.i_bframe_pyramid = X264_B_PYRAMID_NORMAL;
> param.b_open_gop = 0;
> 
> 
> 
> ------------------------------
> 
> Subject: Digest Footer
> 
> _______________________________________________
> x264-devel mailing list
> x264-devel at videolan.org
> https://mailman.videolan.org/listinfo/x264-devel
> 
> 
> ------------------------------
> 
> End of x264-devel Digest, Vol 91, Issue 3
> *****************************************