libx264编码部分参数说明

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//代码示例  

x264_param_default_preset(&m_x264param,"ultrafast","zerolatency"); //ultrafast cpu占用最小，zerolatency 不缓存帧  

m_x264param.i_width = width;  

m_x264param.i_height = height;  

m_x264param.b_repeat_headers = 1; //每个关键帧前都发送sps和pps  

m_x264param.b_cabac = 1; //自适应上下文算术编码，baseline 不支持  

m_x264param.i_threads = 4;// 建议为cpu个数  

m_x264param.i_fps_num = 25;  

m_x264param.i_keyint_max=50;  

m_x264param.i_fps_den=1;//帧率分母  

m_x264param.i_fps_num=25;//帧率分子  

  

m_x264param.rc.b_mb_tree=0;//不为0导致编码延时帧，实时编码是强烈建议为0  

m_x264param.r_rf_constant=25;  

m_x264param.r_rf_constant_max=45;  

m_x264param.rc.i_rc_method=X264_RC_CQP; //码率控制参数 CQP 恒定质量 CRF 恒定码率 ABR 平均码率  

  

x264_param_apply_profile(&m_x264param,"heigh");  

m_x264param.i_level_idc = 30;  

m_x264param.i_log_level = X264_LOG_DEBUG;  

m_x264param.pf_log = x264_pf_log;  

m_x264param.i_csp = X264_CSP_I422; // 不支持baseline  

m_px264handle = x264_encoder_open(&m_x264param);  

  

m_pPicIn = new x264_picture_t;  

m_pPicOut = new x264_pictrue_t;  

x264_picture_init(m_pPicOut);  

x264_picture_alloc(m_pPicIn,X264_CSP_I422,m_x264param.i_width,m_x264param.i_height);