x264_param_default
{
?? ?/* 開辟內存空間*/
??? memset( param, 0, sizeof( x264_param_t ) );?????
?
?? ?/* CPU自動檢測 */
??? param->cpu = x264_cpu_detect();
??? param->i_threads = X264_THREADS_AUTO; /* 并行編碼線程為0 */
??? param->b_deterministic = 1; /*允許非確定性時線程優化*/
??? param->i_sync_lookahead = X264_SYNC_LOOKAHEAD_AUTO;/* 自動選擇線程超前緩沖大小-1 */
?
?? ?/* 視頻屬性 */
??? param->i_csp?????????? = X264_CSP_I420; /*設置輸入的視頻采樣的格式0x0001yuv 4:2:0 planar*/
??? param->i_width???????? = 0; /* 寬度*/
??? param->i_height??????? = 0; /* 高度*/
??? param->vui.i_sar_width = 0;
??? param->vui.i_sar_height= 0; /* 設置長寬比 */
??? param->vui.i_overscan? = 0;? /* 過掃描線，默認undef(不設置)，可選：show(觀看)crop(去除) */
??? param->vui.i_vidformat = 5;? /* undef視頻格式 */
??? param->vui.b_fullrange = 0;? /* off */
??? param->vui.i_colorprim = 2;? /* undef原始色度格式*/
??? param->vui.i_transfer? = 2;? /* undef 轉換方式*/
??? param->vui.i_colmatrix = 2;? /* undef 色度矩陣設置*/
??? param->vui.i_chroma_loc= 0;? /* left center 色度樣本指定，范圍0~5，默認0*/
??? param->i_fps_num??? ???= 25; /*幀率*/
??? param->i_fps_den?????? = 1; /*用兩個整型的數的比值，來表示幀率*/
??? param->i_level_idc???? = -1; /* level值的設置*/
??? param->i_slice_max_size = 0; /* 每片字節的最大數，包括預計的NAL開銷. */
??? param->i_slice_max_mbs = 0; /* 每片宏塊的最大數，重寫 i_slice_count */
??? param->i_slice_count = 0; /* 每幀的像條數目: 設置矩形像條. */
?
??? /* 編碼參數 */
??? param->i_frame_reference = 3; /*參考幀的最大幀數。*/
??? param->i_keyint_max = 250; /* 在此間隔設置IDR關鍵幀 */
??? param->i_keyint_min = 25; /* 場景切換少于次值編碼位I, 而不是 IDR. */
??? param->i_bframe = 3; /*兩個參考幀之間的B幀數目*/
?? ?param->i_scenecut_threshold = 40; /*如何積極地插入額外的I幀 */
??? param->i_bframe_adaptive = X264_B_ADAPT_FAST; /*自適應B幀判定1*/
??? param->i_bframe_bias = 0; /*控制插入B幀判定，范圍-100~+100，越高越容易插入B幀*/
??? param->b_bframe_pyramid = 0; /*允許部分B為參考幀 */
?
??? param->b_deblocking_filter = 1; /*去塊效應相關*/
??? param->i_deblocking_filter_alphac0 = 0; /* [-6, 6] -6 亮度濾波器, 6 強 */
??? param->i_deblocking_filter_beta = 0; /* [-6, 6]? 同上 */
?
??? param->b_cabac = 1; /*cabac的開關*/
??? param->i_cabac_init_idc = 0;
??
/*碼率控制*/
??? param->rc.i_rc_method = X264_RC_CRF;;/*恒定碼率*/
??? param->rc.i_bitrate = 0;/*設置平均碼率大小*/
??? param->rc.f_rate_tolerance = 1.0;
??? param->rc.i_vbv_max_bitrate = 0; /*平均碼率模式下，最大瞬時碼率，默認0(與-B設置相同) */
??? param->rc.i_vbv_buffer_size = 0; /*碼率控制緩沖區的大小，單位kbit，默認0 */
??? param->rc.f_vbv_buffer_init = 0.9; /* <=1: fraction of buffer_size. >1: kbit碼率控制緩沖區數據保留的最大數據量與緩沖區大小之比，范圍0~1.0，默認0.9*/
??? param->rc.i_qp_constant = 23;;/*最小qp值*/
??? param->rc.f_rf_constant = 23;
??? param->rc.i_qp_min = 10; /*允許的最小量化值 */
??? param->rc.i_qp_max = 51; /*允許的最大量化值*/
??? param->rc.i_qp_step = 4; /*幀間最大量化步長 */
??? param->rc.f_ip_factor = 1.4;
??? param->rc.f_pb_factor = 1.3;
??? param->rc.i_aq_mode = X264_AQ_VARIANCE; /* psy adaptive QP. (X264_AQ_*) *//通過減少色度量化偏移量的方法來提高亮度的總體質量。adaptive QP.
??? param->rc.f_aq_strength = 1.0;
??? param->rc.i_lookahead = 40;
?
??? param->rc.b_stat_write = 0; /* Enable stat writing in psz_stat_out */
??? param->rc.psz_stat_out = "x264_2pass.log";
??? param->rc.b_stat_read = 0;
??? param->rc.psz_stat_in = "x264_2pass.log";
param->rc.f_qcompress = 0.6; /* 0.0 => cbr, 1.0 => constant qp */??
?param->rc.f_qblur = 0.5; ? /*時間上模糊量化 */
??? param->rc.f_complexity_blur = 20; /* 時間上模糊復雜性 */
??? param->rc.i_zones = 0; /* number of zone_t's */
??? param->rc.b_mb_tree = 1; /* Macroblock-tree ratecontrol. */
?
?? ?/* 日志 */
??? param->pf_log = x264_log_default;
??? param->p_log_private = NULL;
??? param->i_log_level = X264_LOG_INFO;/*默認為“Info”*/
?
?? ?/*分析 */
??? param->analyse.intra = X264_ANALYSE_I4x4 | X264_ANALYSE_I8x8;
??? param->analyse.inter = X264_ANALYSE_I4x4 | X264_ANALYSE_I8x8
????????????? ???????????| X264_ANALYSE_PSUB16x16 | X264_ANALYSE_BSUB16x16;
??? param->analyse.i_direct_mv_pred = X264_DIRECT_PRED_SPATIAL;/*空間預測模式*/
??? param->analyse.i_me_method = X264_ME_HEX;/*運動估計算法HEX*/
??? param->analyse.f_psy_rd = 1.0;
??? param->analyse.b_psy = 1;
??? param->analyse.f_psy_trellis = 0;
??? param->analyse.i_me_range = 16;/*運動估計范圍*/
??? param->analyse.i_subpel_refine = 7; /* 亞像素運動估計質量 */
??? param->analyse.b_mixed_references = 1; /*允許每個宏塊的分區在P幀有它自己的參考號*/
??? param->analyse.b_chroma_me = 1; /* 亞像素色度運動估計和P幀的模式選擇 */
??? param->analyse.i_mv_range_thread = -1; /* 線程之間的最小空間. -1 = auto, based on number of threads. */
??? param->analyse.i_mv_range = -1; /*運動矢量最大長度set from level_idc*/
??? param->analyse.i_chroma_qp_offset = 0; /*色度量化步長偏移量 */
??? param->analyse.b_fast_pskip = 1; /*快速P幀跳過檢測*/
??? param->analyse.b_weighted_bipred = 1; /*為b幀隱式加權 */
??? param->analyse.b_dct_decimate = 1; /* 在P-frames轉換參數域 */
??? param->analyse.b_transform_8x8 = 1; /* 幀間分區*/
??? param->analyse.i_trellis = 1; /* Trellis量化，對每個8x8的塊尋找合適的量化值，需要CABAC，默認0 0：關閉1：只在最后編碼時使用2：一直使用*/
??? param->analyse.i_luma_deadzone[0] = 21; /*幀間亮度量化中使用的無效區大小*/
??? param->analyse.i_luma_deadzone[1] = 11; /*幀內亮度量化中使用的無效區大小*/
??? param->analyse.b_psnr = 0;/*是否顯示PSNR*/
??? param->analyse.b_ssim = 0;/*是否顯示SSIM*/
?
/*量化*/
??? param->i_cqm_preset = X264_CQM_FLAT; /*自定義量化矩陣(CQM),初始化量化模式為flat 0*/
??? memset( param->cqm_4iy, 16, 16 );
??? memset( param->cqm_4ic, 16, 16 );
??? memset( param->cqm_4py, 16, 16 );
??? memset( param->cqm_4pc, 16, 16 );
??? memset( param->cqm_8iy, 16, 64 );
??? memset( param->cqm_8py, 16, 64 );/*開辟空間*/
? ??/*muxing*/
??? param->b_repeat_headers = 1; /* 在每個關鍵幀前放置SPS/PPS*/
param->b_aud = 0; /*生成訪問單元分隔符*/
}
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