【资料图】
思路
上一篇文章提到了XAVC的一些背景,以及非每帧固定码率的实现方法。然而如果要实现XAVC中的CBG模式(Constrained Bytes per GOP)就必须修改x264源码固定每帧码率。
x264中对松下 AVC Intra Class 有支持,AVC Intra Class 100/200是定义在HD下的与XAVC类似的标准。因此可以通过扩展这部分的代码功能来实现4K XAVC Intra Class 300/480。
应用设置接口参数 avcintra-class=300 avcintra-flavor=sony进行编码标准的设置。
代码
diff --git a/encoder/encoder.c b/encoder/encoder.cindex 074c4a5c..5fb84fcd 100644--- a/encoder/encoder.c+++ b/encoder/encoder.c@@ -678,9 +678,13 @@ static int validate_parameters( x264_t *h, int b_open ) return -1; } - int type = h->param.i_avcintra_class == 200 ? 2 :+ int type = h->param.i_avcintra_class == 480 ? 4 :+ h->param.i_avcintra_class == 300 ? 3 :+ h->param.i_avcintra_class == 200 ? 2 : h->param.i_avcintra_class == 100 ? 1 : h->param.i_avcintra_class == 50 ? 0 : -1;+ int xavc = (h->param.i_avcintra_flavor == X264_AVCINTRA_FLAVOR_SONY);+ if( type < 0 ) { x264_log( h, X264_LOG_ERROR, "Invalid AVC-Intra class\n" );@@ -733,21 +737,101 @@ static int validate_parameters( x264_t *h, int b_open ) { 24000, 1001, 0, 7444, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }}} }; - int res = -1;- if( i_csp >= X264_CSP_I420 && i_csp < X264_CSP_I422 && !type )+ /* [50/100/200/300/480][720p/1440x1080/1080p/2048x1080/4K][fps] */+ static const struct {- if( h->param.i_width == 1440 && h->param.i_height == 1080 ) res = 1;- else if( h->param.i_width == 960 && h->param.i_height == 720 ) res = 0;- }- else if( i_csp >= X264_CSP_I422 && i_csp < X264_CSP_I444 && type )+ uint16_t fps_num;+ uint16_t fps_den;+ uint8_t interlaced;+ uint16_t frame_size;+ const uint8_t *cqm_4ic;+ const uint8_t *cqm_8iy;+ } xavcintra_lut[5][5][7] = {- if( h->param.i_width == 1920 && h->param.i_height == 1080 ) res = 1;- else if( h->param.i_width == 1280 && h->param.i_height == 720 ) res = 0;- }- else+ {{{}},+ {{ 50, 1, 1, 2120, x264_cqm_avci50_4ic, x264_cqm_avci50_p_8iy },+ { 60000, 1001, 1, 1744, x264_cqm_avci50_4ic, x264_cqm_avci50_p_8iy },+ { 24000, 1001, 0, 1744, x264_cqm_avci50_4ic, x264_cqm_avci50_p_8iy },+ { 25, 1, 0, 2120, x264_cqm_avci50_4ic, x264_cqm_avci50_p_8iy },+ { 30000, 1001, 0, 1744, x264_cqm_avci50_4ic, x264_cqm_avci50_p_8iy }}},+ {{{ 60000, 1001, 0, 1804, x264_cqm_avci100_720p_4ic, x264_cqm_avci100_720p_8iy },+ { 50, 1, 0, 2180, x264_cqm_avci100_720p_4ic, x264_cqm_avci100_720p_8iy }},+ {{}},+ {{ 50, 1, 1, 4368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080i_8iy },+ { 60000, 1001, 1, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080i_8iy },+ { 24000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 25, 1, 0, 4368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 30000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 50, 1, 0, 4368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 60000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }},+ {{ 24000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 24, 1, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 25, 1, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 30000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 50, 1, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 60000, 1001, 0, 3616, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }}},+ {{{}},+ {{}},+ {{ 50, 1, 1, 8864, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080i_8iy },+ { 60000, 1001, 1, 7368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080i_8iy },+ { 24000, 1001, 0, 7368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 25, 1, 0, 8864, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 30000, 1001, 0, 7368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 50, 1, 0, 8864, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 60000, 1001, 0, 7368, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }}},+ {{{}},+ {{}},+ {{}},+ {{}},+ {{ 24000, 1001, 0, 9768, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 25, 1, 0, 9768, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 30000, 1001, 0, 9768, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 50, 1, 0, 9768, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 60000, 1001, 0, 9768, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }}},+ {{{}},+ {{}},+ {{}},+ {{}},+ {{ 24000, 1001, 0,15624, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 25, 1, 0,15624, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 30000, 1001, 0,15624, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 50, 1, 0,15624, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy },+ { 60000, 1001, 0,15624, x264_cqm_avci100_1080_4ic, x264_cqm_avci100_1080p_8iy }}},+ };++ int res = -1;+ if(xavc) {- x264_log( h, X264_LOG_ERROR, "Invalid colorspace for AVC-Intra %d\n", h->param.i_avcintra_class );- return -1;+ if( i_csp >= X264_CSP_I422 && i_csp < X264_CSP_I444 && type )+ {+ if( h->param.i_width == 1280 && h->param.i_height == 720 ) res = 0;+ else if(h->param.i_width == 1440 && h->param.i_height == 1080 ) res = 1;+ else if(h->param.i_width == 1920 && h->param.i_height == 1080 ) res = 2;+ else if(h->param.i_width == 2048 && h->param.i_height == 1080 ) res = 3;+ else if(h->param.i_width == 3840 && h->param.i_height == 2160 ) res = 4;+ else if(h->param.i_width == 4096 && h->param.i_height == 2160 ) res = 4;+ }+ else+ {+ x264_log( h, X264_LOG_ERROR, "Invalid colorspace for XAVC-Intra %d\n", h->param.i_avcintra_class );+ return -1;+ }+ } else {+ if( i_csp >= X264_CSP_I420 && i_csp < X264_CSP_I422 && !type )+ {+ if( h->param.i_width == 1440 && h->param.i_height == 1080 ) res = 1;+ else if( h->param.i_width == 960 && h->param.i_height == 720 ) res = 0;+ }+ else if( i_csp >= X264_CSP_I422 && i_csp < X264_CSP_I444 && type )+ {+ if( h->param.i_width == 1920 && h->param.i_height == 1080 ) res = 1;+ else if( h->param.i_width == 1280 && h->param.i_height == 720 ) res = 0;+ }+ else+ {+ x264_log( h, X264_LOG_ERROR, "Invalid colorspace for AVC-Intra %d\n", h->param.i_avcintra_class );+ return -1;+ } } if( res < 0 )@@ -774,11 +858,20 @@ static int validate_parameters( x264_t *h, int b_open ) x264_reduce_fraction( &fps_num, &fps_den ); for( i = 0; i < 7; i++ ) {- if( avcintra_lut[type][res][i].fps_num == fps_num &&- avcintra_lut[type][res][i].fps_den == fps_den &&- avcintra_lut[type][res][i].interlaced == PARAM_INTERLACED )- {- break;+ if (xavc) {+ if( xavcintra_lut[type][res][i].fps_num == fps_num &&+ xavcintra_lut[type][res][i].fps_den == fps_den &&+ xavcintra_lut[type][res][i].interlaced == PARAM_INTERLACED )+ {+ break;+ }+ } else {+ if( avcintra_lut[type][res][i].fps_num == fps_num &&+ avcintra_lut[type][res][i].fps_den == fps_den &&+ avcintra_lut[type][res][i].interlaced == PARAM_INTERLACED )+ {+ break;+ } } } if( i == 7 )@@ -806,7 +899,7 @@ static int validate_parameters( x264_t *h, int b_open ) h->param.analyse.intra = X264_ANALYSE_I8x8; h->param.analyse.i_chroma_qp_offset = res && type ? 3 : 4; h->param.b_cabac = !type;- h->param.rc.i_vbv_buffer_size = avcintra_lut[type][res][i].frame_size;+ h->param.rc.i_vbv_buffer_size = xavc ? xavcintra_lut[type][res][i].frame_size : avcintra_lut[type][res][i].frame_size; h->param.rc.i_vbv_max_bitrate = h->param.rc.i_bitrate = h->param.rc.i_vbv_buffer_size * fps_num / fps_den; h->param.rc.i_rc_method = X264_RC_ABR;@@ -814,8 +907,13 @@ static int validate_parameters( x264_t *h, int b_open ) h->param.rc.b_filler = 1; h->param.i_cqm_preset = X264_CQM_CUSTOM; memcpy( h->param.cqm_4iy, x264_cqm_jvt4i, sizeof(h->param.cqm_4iy) );- memcpy( h->param.cqm_4ic, avcintra_lut[type][res][i].cqm_4ic, sizeof(h->param.cqm_4ic) );- memcpy( h->param.cqm_8iy, avcintra_lut[type][res][i].cqm_8iy, sizeof(h->param.cqm_8iy) );+ if (xavc) {+ memcpy( h->param.cqm_4ic, xavcintra_lut[type][res][i].cqm_4ic, sizeof(h->param.cqm_4ic) );+ memcpy( h->param.cqm_8iy, xavcintra_lut[type][res][i].cqm_8iy, sizeof(h->param.cqm_8iy) );+ } else {+ memcpy( h->param.cqm_4ic, avcintra_lut[type][res][i].cqm_4ic, sizeof(h->param.cqm_4ic) );+ memcpy( h->param.cqm_8iy, avcintra_lut[type][res][i].cqm_8iy, sizeof(h->param.cqm_8iy) );+ } /* Sony XAVC flavor much more simple */ if( h->param.i_avcintra_flavor == X264_AVCINTRA_FLAVOR_SONY )
运行
./ffmpeg -i "/home/lyh/4K/Customer/Sobey/2018080927test_video/10M_SR012CA3.mp4" -r 50 -pix_fmt yuv422p10le -c:v libx264 -avcintra-class 300 -x264opts avcintra-class=300 -x264opts avcintra-flavor=sony 1.mxf