YUV\u4e3b\u8981\u7684\u91c7\u6a23\u683c\u5f0f
\n\u00a0\u00a0\u00a0 \u4e3b\u8981\u7684\u91c7\u6a23\u683c\u5f0f\u6709YCbCr 4:2:0\u3001YCbCr 4:2:2\u3001YCbCr 4:1:1\u548c YCbCr 4:4:4\u3002\u5176\u4e2dYCbCr 4:1:1 \u6bd4\u8f03\u5e38\u7528\uff0c\u5176\u542b\u7fa9\u70ba\uff1a\u6bcf\u500b\u9ede\u4fdd\u5b58\u58f9\u500b 8bit \u7684\u4eae\u5ea6\u503c\uff08\u4e5f\u5c31\u662fY\u503c\uff09\uff0c \u6bcf 2×2 \u500b\u9ede\u4fdd\u5b58\u58f9\u500b Cr \u548cCb \u503c\uff0c \u5716\u50cf\u5728\u8089\u773c\u4e2d\u7684\u611f\u89ba\u4e0d\u6703\u8d77\u592a\u5927\u7684\u8b8a\u5316\u3002\u6240\u4ee5\uff0c \u539f\u4f86\u7528 RGB\uff08R,G,B \u90fd\u662f 8bit unsigned\uff09 \u6a21\u578b\uff0c 4 \u500b\u9ede\u9700\u8981 8×3=24 bites\uff08\u5982\u4e0b\u5716\u7b2c\u58f9\u500b\u5716\uff09\u3002 \u800c\u73fe\u5728\u50c5\u9700\u8981 8+\uff088\/4\uff09+\uff088\/4\uff09=12bites, \u5e73\u5747\u6bcf\u500b\u9ede\u536012bites\uff08\u5982\u4e0b\u5716\u7b2c\u4e8c\u500b\u5716\uff09\u3002\u9019\u6a23\u5c31\u628a\u5716\u50cf\u7684\u6578\u64da\u58d3\u7e2e\u4e86\u58f9\u534a\u3002
\n\u00a0\u00a0\u00a0 \u4e0a\u908a\u50c5\u7d66\u51fa\u4e86\u7406\u8ad6\u4e0a\u7684\u793a\u4f8b\uff0c\u5728\u5be6\u969b\u6578\u64da\u5b58\u5132\u4e2d\u662f\u6709\u53ef\u80fd\u662f\u4e0d\u540c\u7684\uff0c\u4e0b\u9762\u7d66\u51fa\u5e7e\u7a2e\u5177\u9ad4\u7684\u5b58\u5132\u5f62\u5f0f\uff1a
\n\u00a0\u00a0\u00a0 \uff081\uff09\u00a0\u00a0\u00a0 YUV 4:4:4
\n\u00a0\u00a0\u00a0 YUV\u4e09\u500b\u4fe1\u9053\u7684\u62bd\u6a23\u7387\u76f8\u540c\uff0c\u56e0\u6b64\u5728\u751f\u6210\u7684\u5716\u50cf\u88cf\uff0c\u6bcf\u500b\u8c61\u7d20\u7684\u4e09\u500b\u5206\u91cf\u4fe1\u606f\u5b8c\u6574\uff08\u6bcf\u500b\u5206\u91cf\u901a\u5e388\u6bd4\u7279\uff09\uff0c\u7d93\u904e8\u6bd4\u7279\u91cf\u5316\u4e4b\u5f8c\uff0c\u672a\u7d93\u58d3\u7e2e\u7684\u6bcf\u500b\u50cf\u7d20\u5360\u75283\u500b\u5b57\u7bc0\u3002
\n\u00a0\u00a0\u00a0 \u4e0b\u9762\u7684\u56db\u500b\u50cf\u7d20\u70ba\uff1a [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3]
\n\u00a0\u00a0\u00a0 \u5b58\u653e\u7684\u78bc\u6d41\u70ba\uff1a Y0 U0 V0 Y1 U1 V1 Y2 U2 V2 Y3 U3 V3
\n\u00a0\u00a0\u00a0 \uff082\uff09\u00a0\u00a0 YUV 4:2:2
\n\u00a0\u00a0\u00a0 \u6bcf\u500b\u8272\u5dee\u4fe1\u9053\u7684\u62bd\u6a23\u7387\u662f\u4eae\u5ea6\u4fe1\u9053\u7684\u58f9\u534a\uff0c\u6240\u4ee5\u6c34\u5e73\u65b9\u5411\u7684\u8272\u5ea6\u62bd\u6a23\u7387\u53ea\u662f4:4:4\u7684\u58f9\u534a\u3002\u5c0d\u975e\u58d3\u7e2e\u76848\u6bd4\u7279\u91cf\u5316\u7684\u5716\u50cf\u4f86\u8aaa\uff0c\u6bcf\u500b\u7531\u5169\u500b\u6c34\u5e73\u65b9\u5411\u76f8\u9130\u7684\u50cf\u7d20\u7d44\u6210\u7684\u5b8f\u50cf\u7d20\u9700\u8981\u5360\u75284\u5b57\u7bc0\u5167\u5b58\u3002
\n\u00a0\u00a0\u00a0 \u4e0b\u9762\u7684\u56db\u500b\u50cf\u7d20\u70ba\uff1a [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3]
\n\u00a0\u00a0\u00a0 \u5b58\u653e\u7684\u78bc\u6d41\u70ba\uff1a Y0 U0 Y1 V1 Y2 U2 Y3 V3
\n\u00a0\u00a0\u00a0 \u6620\u5c04\u51fa\u50cf\u7d20\u9ede\u70ba\uff1a[Y0 U0 V1] [Y1 U0 V1] [Y2 U2 V3] [Y3 U2 V3]
\n\u00a0\u00a0\u00a0 \uff083\uff09\u00a0\u00a0 YUV 4:1:1
\n\u00a0\u00a0\u00a0 4:1:1\u7684\u8272\u5ea6\u62bd\u6a23\uff0c\u662f\u5728\u6c34\u5e73\u65b9\u5411\u4e0a\u5c0d\u8272\u5ea6\u9032\u884c4:1\u62bd\u6a23\u3002\u5c0d\u65bc\u4f4e\u7aef\u7528\u6236\u548c\u6d88\u8cbb\u985e\u7522\u54c1\u9019\u4ecd\u7136\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002\u5c0d\u975e\u58d3\u7e2e\u76848\u6bd4\u7279\u91cf\u5316\u7684\u8996\u983b\u4f86\u8aaa\uff0c\u6bcf\u500b\u75314\u500b\u6c34\u5e73\u65b9\u5411\u76f8\u9130\u7684\u50cf\u7d20\u7d44\u6210\u7684\u5b8f\u50cf\u7d20\u9700\u8981\u5360\u75286\u5b57\u7bc0\u5167\u5b58
\n\u00a0\u00a0\u00a0 \u4e0b\u9762\u7684\u56db\u500b\u50cf\u7d20\u70ba\uff1a [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3]
\n\u00a0\u00a0\u00a0 \u5b58\u653e\u7684\u78bc\u6d41\u70ba\uff1a Y0 U0 Y1 Y2 V2 Y3
\n\u00a0\u00a0\u00a0 \u6620\u5c04\u51fa\u50cf\u7d20\u9ede\u70ba\uff1a[Y0 U0 V2] [Y1 U0 V2] [Y2 U0 V2] [Y3 U0 V2]
\n\u00a0\u00a0\u00a0 \uff084\uff09YUV4:2:0
\n\u00a0\u00a0\u00a0 4:2:0\u4e26\u4e0d\u610f\u5473\u8457\u53ea\u6709Y,Cb\u800c\u6c92\u6709Cr\u5206\u91cf\u3002\u5b83\u6307\u5f97\u662f\u5c0d\u6bcf\u884c\u6383\u63cf\u7dda\u4f86\u8aaa\uff0c\u53ea\u6709\u58f9\u7a2e\u8272\u5ea6\u5206\u91cf\u4ee52:1\u7684\u62bd\u6a23\u7387\u5b58\u5132\u3002\u9032\u884c\u9694\u884c\u6383\u63cf\uff0c\u76f8\u9130\u7684\u6383\u63cf\u884c\u5b58\u5132\u4e0d\u540c\u7684\u8272\u5ea6\u5206\u91cf\uff0c\u4e5f\u5c31\u662f\u8aaa\uff0c\u5982\u679c\u58f9\u884c\u662f4:2:0\u7684\u8a71\uff0c\u4e0b\u58f9\u884c\u5c31\u662f4:0:2\uff0c\u518d\u4e0b\u58f9\u884c\u662f4:2:0\u2026\u4ee5\u6b64\u985e\u63a8\u3002\u5c0d\u6bcf\u500b\u8272\u5ea6\u5206\u91cf\u4f86\u8aaa\uff0c\u6c34\u5e73\u65b9\u5411\u548c\u8c4e\u76f4\u65b9\u5411\u7684\u62bd\u6a23\u7387\u90fd\u662f2:1\uff0c\u6240\u4ee5\u53ef\u4ee5\u8aaa\u8272\u5ea6\u7684\u62bd\u6a23\u7387\u662f4:1\u3002\u5c0d\u975e\u58d3\u7e2e\u76848\u6bd4\u7279\u91cf\u5316\u7684\u8996\u983b\u4f86\u8aaa\uff0c\u6bcf\u500b\u75312×2\u500b2\u884c2\u5217\u76f8\u9130\u7684\u50cf\u7d20\u7d44\u6210\u7684\u5b8f\u50cf\u7d20\u9700\u8981\u5360\u75286\u5b57\u7bc0\u5167\u5b58\u3002
\n\u00a0\u00a0\u00a0 \u4e0b\u9762\u516b\u500b\u50cf\u7d20\u70ba\uff1a[Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3]
\n\u00a0\u00a0\u00a0 [Y5 U5 V5] [Y6 U6 V6] [Y7U7 V7] [Y8 U8 V8]
\n\u00a0\u00a0\u00a0 \u5b58\u653e\u7684\u78bc\u6d41\u70ba\uff1aY0 U0 Y1 Y2 U2 Y3
\n\u00a0\u00a0\u00a0 Y5 V5 Y6 Y7 V7 Y8
\n\u00a0\u00a0\u00a0 \u6620\u5c04\u51fa\u7684\u50cf\u7d20\u9ede\u70ba\uff1a[Y0 U0 V5] [Y1 U0 V5] [Y2 U2 V7] [Y3 U2 V7]
\n\u00a0\u00a0\u00a0 [Y5 U0 V5] [Y6 U0 V5] [Y7U2 V7] [Y8 U2 V7]
\n\u00a0\u00a0\u00a0 \u5c0d\u61c9AVPicture\u88cf\u9762\u6709data[4]\u548clinesize[4]\u5176\u4e2ddata\u662f\u58f9\u500b\u6307\u5411\u6307\u91dd\u7684\u6307\u91dd\uff08\u4e8c\u7d1a\u3001\u4e8c\u7dad\u6307\u91dd\uff09\uff0c\u4e5f\u5c31\u662f\u6307\u5411\u8996\u983b\u6578\u64da\u7de9\u6c96\u5340\u7684\u9996\u5730\u5740\uff0c\u800cdata[0]~data[3]\u662f\u58f9\u7d1a\u6307\u91dd\uff0c\u53ef\u4ee5\u7528\u5982\u4e0b\u7684\u5716\u4f86\u8868\u793a\uff1a
\n\u00a0\u00a0\u00a0 data –>xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
\n\u00a0\u00a0\u00a0 ^\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ^\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ^
\n\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |
\n\u00a0\u00a0\u00a0 data[0]\u00a0\u00a0\u00a0\u00a0\u00a0 data[1]\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 data[2]
\n\u00a0\u00a0\u00a0 \u6bd4\u5982\u8aaa\uff0c\u7576pix_fmt=PIX_FMT_YUV420P\u6642\uff0cdata\u4e2d\u7684\u6578\u64da\u662f\u6309\u7167YUV\u7684\u683c\u5f0f\u5b58\u5132\u7684\uff0c\u4e5f\u5c31\u662f\uff1a
\n\u00a0\u00a0\u00a0 data –>YYYYYYYYYYYYYYUUUUUUUUUUUUUVVVVVVVVVVVV
\n\u00a0\u00a0\u00a0 ^\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ^\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ^
\n\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |
\n\u00a0\u00a0\u00a0 data[0]\u00a0\u00a0\u00a0 data[1]\u00a0\u00a0\u00a0\u00a0\u00a0 data[2]
\n\u00a0\u00a0\u00a0 linesize\u662f\u6307\u5c0d\u61c9\u65bc\u6bcf\u58f9\u884c\u7684\u5927\u5c0f\uff0c\u70ba\u4ec0\u9ebd\u9700\u8981\u9019\u500b\u8b8a\u91cf\uff0c\u662f\u56e0\u70ba\u5728YUV\u683c\u5f0f\u548cRGB\u683c\u5f0f\u6642\uff0c\u6bcf\u884c\u7684\u5927\u5c0f\u4e0d\u58f9\u5b9a\u7b49\u65bc\u5716\u50cf\u7684\u5bec\u5ea6\uff0c\u5c0d\u65bcRGB\u683c\u5f0f\u8f38\u51fa\u6642\uff0c\u53ea\u6709\u58f9\u500b\u901a\u9053\uff08bgrbgrbgr\u2026\u2026\uff09\u53ef\u7528\uff0c\u5373linesize[0],\u548cdata[0],so RGB24 : data[0] = packet rgb\/\/bgrbgrbgr\u2026\u2026
\n\u00a0\u00a0\u00a0 linesize[0] = width*3
\n\u00a0\u00a0\u00a0 \u5176\u4ed6\u7684\u5982data[1][2][3]\u8207linesize[1][2][3]\u7121\u4efb\u4f55\u610f\u7fa9\u3002
\n\u00a0\u00a0\u00a0 \u800c\u5c0d\u65bc\uff39\uff35\uff36\u683c\u5f0f\u8f38\u51fa\u6642\uff0c\u6709\u4e09\u500b\u901a\u9053\u53ef\u7528\uff0c\u5373data[0][1][2],\u8207linesize[0][1][2]\uff0c\u800cyuv\u683c\u5f0f\u5c0d\u65bc\u904b\u52d5\u4f30\u8a08\u6642\uff0c\u9700\u8981\u586b\u5145padding\uff08right, bottom\uff09\uff0c\u6545\uff1a
\n\u00a0\u00a0\u00a0 linesize=width+padding size\uff0816+16\uff09\u3002
\n\u00a0\u00a0\u00a0 \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
\n\u00a0\u00a0\u00a0 case PIX_FMT_YUV420P:\u00a0\u00a0 case PIX_FMT_YUVJ420P:\u00a0\u00a0 case PIX_FMT_RGB555:\u00a0\u00a0\u00a0 if \uff08PIC_DIRECTION_0 == m_dwFilpPicDirection\uff09\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [0] += m_pYuvFrame->linesize[0] *\u00a0 m_pVCodecContext->height;\u00a0\u00a0\u00a0\u00a0 \/\/\u56e0\u70ba\u662f\u9694\u884c\u6383\u63cfU\u8207V\u53ea\u6709\u9ad8\u5ea6\u7684\u58f9\u534a\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [1] += m_pYuvFrame->linesize[1] *\u00a0 m_pVCodecContext->height\/2;\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [2] += m_pYuvFrame->linesize[2] *\u00a0 m_pVCodecContext->height\/2;\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[0] = -m_pYuvFrame->linesize[0];\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[1] = -m_pYuvFrame->linesize[1];\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[2] = -m_pYuvFrame->linesize[2];\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break;\u00a0\u00a0 case PIX_FMT_YUVJ422P:\u00a0\u00a0 case PIX_FMT_YUV422P:\u00a0\u00a0 case PIX_FMT_YUYVJ422:\u00a0\u00a0 case PIX_FMT_YUV411P:\u00a0\u00a0 case PIX_FMT_YUYV422:\u00a0\u00a0\u00a0\u00a0\u00a0 if \uff08PIC_DIRECTION_0 == m_dwFilpPicDirection\uff09\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [0] += m_pYuvFrame->linesize[0] *\u00a0 m_pVCodecContext->height;\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [1] += m_pYuvFrame->linesize[1] *\u00a0 m_pVCodecContext->height;\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->data [2] += m_pYuvFrame->linesize[2] *\u00a0 m_pVCodecContext->height;\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[0] = -m_pYuvFrame->linesize[0];\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[1] = -m_pYuvFrame->linesize[1];\u00a0\u00a0\u00a0\u00a0 m_pYuvFrame->linesize[2] = -m_pYuvFrame->linesize[2];\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0 break;\u00a0\u00a0 }\u5728FFMPEG\u4e2d\u8f49\u63dbRGB\u6642\u9806\u4fbf\u985b\u5012\u5716\u50cf\u7684\u65b9\u5411\u7b97\u6cd5<\/p>\n","protected":false},"excerpt":{"rendered":"
YUV\u4e3b\u8981\u7684\u91c7\u6a23\u683c\u5f0f \u00a0\u00a0\u00a0 \u4e3b\u8981\u7684\u91c7\u6a23\u683c\u5f0f\u6709YCbCr 4:2:0\u3001YCbCr 4:2:2\u3001YCbCr 4: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[531],"tags":[729,728],"class_list":["post-1756","post","type-post","status-publish","format-standard","hentry","category-unix","tag-ffmpeg","tag-yuv"],"_links":{"self":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/1756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/comments?post=1756"}],"version-history":[{"count":0,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/1756\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/media?parent=1756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/categories?post=1756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/tags?post=1756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}