视频x264编码浅析

声明 x264_param_t 结构体变量:

x264_param_t params;

x264_param_default_preset(&params, "ultrafast", "zerolatency");//优化编码延迟?

 

变量参数编码前赋值:

  params.i_csp                = (csp == 17) ? X264_CSP_NV12 : csp;//编码比特流的CSP,仅支持i420,色彩空间设置 
#ifdef    SQUARE_AND_ROTATE
    params.i_width            = w;
    params.i_height            = h;
#else
    params.i_width            = width;
    params.i_height            = height;
#endif
    params.vui.i_sar_width        = 1;
    params.vui.i_sar_height    = 1;    //设置长宽比 

    params.i_fps_num            = fpsnum;//帧率分子    
    params.i_fps_den            = fpsden;//帧率分母 

    params.i_timebase_num    = 1;
    params.i_timebase_den    = 1000;//ms

    params.i_keyint_max        = fpsnum/fpsden;
    params.i_keyint_min        = fpsnum/fpsden;//X264_KEYINT_MIN_AUTO

    params.b_repeat_headers    = 0;//
    params.b_annexb            = 0;

    params.b_deblocking_filter    = 1;
    params.rc.f_rf_constant     = 33;
    params.rc.i_bitrate            = bitrate;


初始化编码器:

enc = x264_encoder_open(&params);

 

获取整个流的pps和SPS??:

int s = x264_encoder_headers(enc, &nals, &nal_count);

-----------------------------------------------------------------

x264编码:

初始化图片信息:

x264_picture_t picin, picout;
x264_picture_init(&picin);

对图片信息参数设定:

picin.i_pts            = ts;
picin.i_type            = X264_TYPE_AUTO;
picin.i_qpplus1        = 0;
picin.img.i_csp        = (csp == 17) ? X264_CSP_NV12 : csp;//special hack for android
。。。。。。。
。。。。。。。
。。。。。


对帧进行x264编码:

ret = x264_encoder_encode(enc, &nals, &nnal, &picin, &picout);

 

 

备注:总结一下就是:

(1)初始化并设定x264_param_t

(2)初始化并设定 x264_picture_t

(3)x264编码

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参考:

X264多线程分析

http://blog.sina.com.cn/s/blog_4ae178ba01013yix.html

x264的编码示例
http://blog.csdn.net/xyyangkun/article/details/7255372/

x264编码详细文字全过程

http://www.cnblogs.com/chuncn/archive/2011/02/25/1459805.html

 

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