typedef struct x264_param_t

{

????CPU 標志位

???unsigned int cpu;

???int????????i_threads;???????并行編碼多幀

???int????????b_deterministic; 是否允許非確定性時線程優化

???int????????i_sync_lookahead;? 線程超前緩沖

????視頻屬性

???int????????i_width;? 寬度

???int????????i_height;? 高度

???int????????i_csp;??編碼比特流的CSP,僅支持i420，色彩空間設置

???int????????i_level_idc;? level值的設置

???int????????i_frame_total;? 編碼幀的總數, 默認 0

Vui參數集視頻可用性信息視頻標準化選項

???struct

???{

????????they will be reduced to be 0 < x <=65535 and prime

???????int????????i_sar_height;

???????int????????i_sar_width;? 設置長寬比

???????int????????i_overscan;????0=undef, 1=no overscan, 2=overscan過掃描線，默認"undef"(不設置)，可選項：show(觀看)/crop(去除)

???????見以下的值h264附件E

???????Int??????i_vidformat; 視頻格式，默認"undef"，component/pal/ntsc/secam/mac/undef

???????int??????b_fullrange; Specify full range samplessetting，默認"off"，可選項：off/on

???????int??????i_colorprim;原始色度格式，默認"undef"，可選項：undef/bt709/bt470m/bt470bg，smpte170m/smpte240m/film

???????int?? i_transfer;轉換方式，默認"undef"，可選項：undef/bt709/bt470m/bt470bg/linear,log100/log316/smpte170m/smpte240m

???????int? i_colmatrix;色度矩陣設置，默認"undef",undef/bt709/fcc/bt470bg,smpte170m/smpte240m/GBR/YCgCo

???????int????????i_chroma_loc;????both top & bottom色度樣本指定，范圍0~5，默認0

???} vui;

???int????????i_fps_num;

???int????????i_fps_den;

這兩個參數是由fps幀率確定的，賦值的過程見下：

{???????floatfps;??????

?if( sscanf( value, "%d/%d",&p->i_fps_num,&p->i_fps_den ) == 2 )

???????????;

???????else if( sscanf( value, "%f", &fps ) )

???????{

???????????p->i_fps_num = (int)(fps * 1000 + .5);

???????????p->i_fps_den = 1000;

???????}

???????else

???????????b_error = 1;

???}

Value的值就是fps。

???流參數

???int????????i_frame_reference;??參考幀最大數目

???int????????i_keyint_max;???????在此間隔設置IDR關鍵幀

???int????????i_keyint_min;???????場景切換少于次值編碼位I, 而不是 IDR.

???int????????i_scenecut_threshold; 如何積極地插入額外的I幀// // 畫面動態變化限，當超出此值時插入I幀，默認40

???int????????i_bframe;??兩個相關圖像間P幀的數目

???int????????i_bframe_adaptive; 自適應B幀判定

???int????????i_bframe_bias; 控制插入B幀判定，范圍-100~+100，越高越容易插入B幀，默認0

???int????????b_bframe_pyramid;??允許部分B為參考幀

去塊濾波器需要的參數

???int????????b_deblocking_filter;去塊效應相關

???int????????i_deblocking_filter_alphac0;????[-6, 6] -6 light filter, 6 strong

???int????????i_deblocking_filter_beta;???????[-6, 6]? idem

?? 熵編碼

???int????????b_cabac;

???int????????i_cabac_init_idc;

???int????????b_interlaced;? 隔行掃描

???量化

???int????????i_cqm_preset;????????自定義量化矩陣(CQM),初始化量化模式為flat

???char???????*psz_cqm_file;??????JM format讀取JM格式的外部量化矩陣文件，自動忽略其他—cqm 選項

???uint8_t????cqm_4iy[16];????????used only if i_cqm_preset == X264_CQM_CUSTOM

???uint8_t????cqm_4ic[16];

???uint8_t????cqm_4py[16];

???uint8_t????cqm_4pc[16];

???uint8_t????cqm_8iy[64];

???uint8_t????cqm_8py[64];

????日志

???void???????(*pf_log)( void *, int i_level, const char *psz, va_list );

???void???????*p_log_private;

???int????????i_log_level;

???int????????b_visualize;

???char???????*psz_dump_yuv;??重建幀的名字

????編碼分析參數

???struct

???{

???????unsigned intintra;?????幀間分區

???????unsigned intinter;?????幀內分區

???????int?????????b_transform_8x8;? 幀間分區

???????int?????????b_weighted_bipred; 為b幀隱式加權

???????int?????????i_direct_mv_pred; 時間空間隊運動預測

???????int?????????i_chroma_qp_offset; 色度量化步長偏移量

???????int?????????i_me_method;? 運動估計算法 (X264_ME_*)

???????int?????????i_me_range;? 整像素運動估計搜索范圍 (from predictedmv)

???????int?????????i_mv_range;? 運動矢量最大長度(in pixels). -1 =auto, based on level

???????int?????????i_mv_range_thread;? 線程之間的最小空間. -1 = auto,based on number of threads.

???????int?????????i_subpel_refine;? 亞像素運動估計質量

???????int?????????b_chroma_me;? 亞像素色度運動估計和P幀的模式選擇

???????int?????????b_mixed_references; 允許每個宏塊的分區在P幀有它自己的參考號

???????int?????????i_trellis;??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

???????int?????????b_fast_pskip; 快速P幀跳過檢測

???????int?????????b_dct_decimate; 在P-frames轉換參數域

???????int?????????i_noise_reduction; 自適應偽盲區

???????float???????f_psy_rd;? Psy RD strength

???????float???????f_psy_trellis;? Psy trellis strength

???????int?????????b_psy;? Toggle all psy optimizations

???????亮度量化中使用的無效區大小

???????int?????????i_luma_deadzone[2];? {幀間, 幀內}

???????int?????????b_psnr;????計算和打印PSNR信息

???????int?????????b_ssim;???計算和打印SSIM信息

???} analyse;

????碼率控制參數

???struct

???{

???????int????????i_rc_method;????X264_RC_*

???????int????????i_qp_constant;??0-51

???????int????????i_qp_min;??????允許的最小量化值

???????int????????i_qp_max;??????允許的最大量化值

???????int????????i_qp_step;?????幀間最大量化步長

???????int????????i_bitrate;? 設置平均碼率

???????float??????f_rf_constant;??1pass VBR, nominal QP

???????float??????f_rate_tolerance;

???????int????????i_vbv_max_bitrate; 平均碼率模式下，最大瞬時碼率，默認0(與-B設置相同)

???????int????????i_vbv_buffer_size; 碼率控制緩沖區的大小，單位kbit，默認0

???????float??????f_vbv_buffer_init;? <=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

???????float??????f_ip_factor;

???????float??????f_pb_factor;

???????int????????i_aq_mode;??????psy adaptive QP. (X264_AQ_*)

???????float??????f_aq_strength;

???????int????????b_mb_tree;??????Macroblock-tree ratecontrol.

???????int????????i_lookahead;

????????2pass 多次壓縮碼率控制

???????int????????b_stat_write;??Enable stat writing in psz_stat_out

???????char???????*psz_stat_out;

???????int????????b_stat_read;????Read stat from psz_stat_in and use it

???????char???????*psz_stat_in;

????????2pass params (same as ffmpeg ones)

???????float??????f_qcompress;????0.0 => cbr, 1.0 => constant qp

???????float??????f_qblur;???????時間上模糊量化

???????float??????f_complexity_blur;? 時間上模糊復雜性

???????x264_zone_t*zones;?????????碼率控制覆蓋

???????int????????i_zones;????????number of zone_t's

???????char???????*psz_zones;????指定區的另一種方法

???} rc;

????Muxing parameters

???intb_aud;?????????????????生成訪問單元分隔符

???intb_repeat_headers;???????在每個關鍵幀前放置SPS/PPS

???inti_sps_id;???????????????SPS 和 PPS id 號

???切片（像條）參數

???inti_slice_max_size;????每片字節的最大數，包括預計的NAL開銷.

???inti_slice_max_mbs;?????每片宏塊的最大數，重寫 i_slice_count

???inti_slice_count;???????每幀的像條數目: 設置矩形像條.

????Optional callback for freeing this x264_param_t when it is donebeing used.

?????Only used when the x264_param_t sits in memory for an indefiniteperiod of time,

?????i.e. when an x264_param_t is passed to x264_t in an x264_picture_tor in zones.

?????Not used when x264_encoder_reconfig is called directly.

???void (*param_free)( void* );

} x264_param_t;

?