{"id":407,"date":"2022-01-31T18:22:52","date_gmt":"2022-01-31T10:22:52","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=407"},"modified":"2022-06-11T03:11:37","modified_gmt":"2022-06-10T19:11:37","slug":"ffmpeg%e5%91%bd%e4%bb%a4%e5%88%86%e6%9e%90-print","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=407","title":{"rendered":"ffmpeg\u547d\u4ee4\u5206\u6790-print"},"content":{"rendered":"\n<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1VpUvpLhew-nuq4Dns80mOw\">\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n<p>\u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ffmpeg \u547d\u4ee4\u53c2\u6570 \u5728\u4ee3\u7801\u91cc\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3002a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1RN1xRsQDGx65MGyB_T1IzA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u547d\u4ee4\u5982\u4e0b\uff1a<code class=\"prettyprint\" >ffmpeg -i a.mp4 -vcodec libx264 -preset placebo output.mp4<\/code><\/p>\n\n\n\n<p>\u672c\u6587\u4e0d\u8bb2\u4e0a\u9762\u7684\u547d\u4ee4\u884c\u53c2\u6570\u5b9e\u73b0\uff0c\u800c\u662f\u6253\u7b97\u8bb2\u89e3\uff0cffmpeg \u8f6c\u7801\u8fc7\u7a0b\u4e2d\u8f93\u51fa\u7684 frame \uff0cfps\uff0cq\uff0csize\uff0c bitrate \uff0cspeed \u7684\u610f\u4e49\uff0c\u5982\u4e0b\u56fe\u3002<\/p>\n\n\n\n<p>\u6700\u91cd\u8981\u7684\u662fspeed\uff0c\u8f6c\u7801\u901f\u5ea6<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1019\" height=\"568\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-13-1.png\" alt=\"\" class=\"wp-image-409\"\/><\/figure>\n\n\n\n<p>\u4eceffmpeg.c \u91cc\u53ef\u4ee5\u770b\u51fa\uff0c\u4e0a\u9762\u7684\u7ea2\u8272\u5708\u51fa\u6765\u7684\u662f print_report() \u51fd\u6570\u6253\u5370\u7684\uff0c\u4e0b\u9762\u5c31\u6765\u5206\u6790 print_report() \u7684\u5b9e\u73b0\uff0c\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"427\" height=\"332\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-13-2.png\" alt=\"\" class=\"wp-image-408\"\/><\/figure>\n\n\n\n<p>print_report() \u5165\u53e3\u4f1a\u505a\u4e00\u4e2a\u65f6\u95f4\u5224\u65ad\uff0c\u6bcf \u96940.5 \u79d2\u624d\u6253\u5370\u4e00\u6b21\u65e5\u5fd7\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >if (!is_last_report) {\n    if (last_time == -1) {\n        last_time = cur_time;\n        return;\n    }\n    \/\/50\u4e07\u5fae\u5999\uff0c0.5\u79d2\u7edf\u8ba1\u4e00\u6b21\u3002\n    if ((cur_time - last_time) &lt; 500000) \/\/\u6ce8\u610f\u8fd9\u91cc\n        return;\n    last_time = cur_time;\n}<\/code><\/pre>\n\n\n\n<p>\u540e\u7eed\u7684\u4ee3\u7801\u6ca1\u6709\u4ec0\u4e48\u597d\u5206\u6790\uff0c\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\uff0c\u81ea\u884c\u67e5\u770b\u5373\u53ef\u3002<\/p>\n\n\n\n<p><strong>frame= 160 fps= 37 q=28.0 size= 0kB time=00:00:07.23 bitrate= 0.1kbits\/s speed=1.68x<\/strong><\/p>\n\n\n\n<p>\u6253\u5370\u65e5\u5fd7\u7684\u53c2\u6570\u89e3\u6790\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\uff0cframe \uff0c\u7528\u7684\u662f ost-&gt;frame_number \u8d4b\u503c\uff0c\u4ee3\u8868\u5f53\u524d\u7f16\u7801\u5230\u89c6\u9891\u6d41\u7684\u7b2c\u51e0\u5e27\u3002<\/p>\n\n\n\n<p>2\uff0cfps\uff0c\u7528\u4e0a\u9762\u7684 frame \u9664\u4ee5\u65f6\u95f4\u5f97\u5230\uff0c\u4ee3\u8868\u4e00\u79d2\u7f16\u7801\u4e86\u591a\u5c11\u4e2a\u89c6\u9891\u5e27\u3002<\/p>\n\n\n\n<p>3\uff0cq\uff0c\u7f16\u7801\u8d28\u91cf\uff0c\u4e5f\u662f\u9488\u5bf9\u89c6\u9891\u7684\u3002q \u7684\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">q = ost-&gt;quality \/ (float) FF_QP2LAMBDA;<\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cq \u662f \u4eceost-&gt;quality \u6765\u7684\uff0c\u90a3 ost-&gt;quality \u7684\u503c\u662f\u5728\u54ea\u91cc\u8d4b\u503c\u7684\u5462\uff1f\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg.c 742\u884c\nuint8_t *sd = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,NULL);\nost-&gt;quality = sd ? AV_RL32(sd) : -1;<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u6d41\u7684\u8d28\u91cfquality\uff0c\u5e94\u8be5\u662f\u4e00\u4e2a\u7d2f\u8ba1\u7684\u503c\u3002\u6211\u4e2a\u4eba\u731c\u6d4b\u7f16\u7801\u5668\u4f1a\u6839\u636e\u4ee5\u5f80\u7f16\u7801\u7684Frame \u4e0d\u65ad\u8ba1\u7b97\u8fd9\u4e2a\u503c\uff0c\u7136\u540e\u653e\u8fdb\u53bb AVPacket \u7684side_data \u91cc\u9762\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5 av_packet_get_side_data() \u83b7\u53d6\u5230 side_data\uff0cside_data \u7684\u524d32\u4f4d\u5c31\u662f quality\uff0cAV_PKT_DATA_QUALITY_STATS \u8fd9\u4e2aside_data\u7684\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" > libavcodec\\avcodec.h 1266\u884c\n \/**\n     * This side data contains quality related information from the encoder.\n     * @code\n     * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).\n     * u8    picture type\n     * u8    error count\n     * u16   reserved\n     * u64le&#091;error count] sum of squared differences between encoder in and output\n     * @endcode\n     *\/\n AV_PKT_DATA_QUALITY_STATS,<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u524d\u9762 3\u4e2a\u53c2\u6570\u90fd\u662f\u9488\u5bf9 \u89c6\u9891\u6d41 \u7684\u5206\u6790<\/p>\n\n\n\n<p>4\uff0csize\uff0c\u5199\u5165\u6587\u4ef6\u7684\u6570\u636e\u5927\u5c0f\uff0c\u901a\u8fc7 avio_size(oc-&gt;pb) \u83b7\u5f97\u3002<\/p>\n\n\n\n<p>5\uff0cbitrate\uff0c\u6bd4\u7279\u7387\uff0c\u8fd9\u4e2abitrate \u7684\u5355\u4f4d\u662f kbits\/s \uff0c\u4e0d\u662f kb\/s \uff0c\u8981\u6ce8\u610f\u3002 kbits\/s \u662f\u6307\u6bcf\u79d2\u4f20\u8f93\u591a\u5c11\u5343\u6bd4\u7279\uff0c\u4e00\u4e2a\u5b57\u8282\u67098\u4e2a\u6bd4\u7279\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u6e90\u7801\u91cc bitrate \u7684\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg.c 1769\u884c\nbitrate = pts &amp;&amp; total_size &gt;= 0 ? total_size * 8 \/ (pts \/ 1000.0) : -1;<\/code><\/pre>\n\n\n\n<p>total_size \u662favio_size() \u8fd4\u56de\u7684\uff0c\u5355\u4f4d\u662f\u5b57\u8282\uff0c\u6240\u4ee5\u4e58\u4ee5 8\uff0cpts \u7684\u5355\u4f4d\u662f\u5fae\u5999\uff0c\u9664\u4ee51000\u540e\u7b49\u4e8e \u5343\u5206\u4e4b\u4e00\u79d2\u3002\u5343\u5206\u4e4b\u4e00\u79d2\u80fd\u4f20\u8f93 ( total_size * 8) \u5927\u5c0f\u7684\u6bd4\u7279\u3002\u90a31\u79d2\u5c31\u80fd\u591f\u4f20\u8f93 ( total_size * 8) * 1000 \u5927\u5c0f\u7684\u6bd4\u7279\u3002\u4f46\u662f\u8f93\u51fa\u7684\u5355\u4f4d\u4e0d\u662f\u6bd4\u7279\uff0c\u800c\u662f\u5343\u6bd4\u7279\uff0ckbits\uff0c\u524d\u9762\u6709\u4e2ak\uff0c\u6240\u4ee5\u8fd9\u4e2a\u4e58\u4ee51000\u5c31\u53ef\u4ee5\u62b5\u6d88\u6389\u3002\u5c31\u5f62\u6210\u6e90\u7801\u7684\u8ba1\u7b97\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>6\uff0cspeed\uff0c\u7f16\u7801\u901f\u5ea6\u3002\u7528\u8f93\u51fa\u6d41\u7684\u6700\u540e\u4e00\u4e2aAVPacket\u7684pts \u9664\u4ee5\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\u3002\u54ea\u4e2a\u6d41\u7684\u6700\u540eAVPacket\u7684pts\u6700\u5927\u5c31\u4ee5\u54ea\u4e2a\u6d41\u7684pts\u4e3a\u51c6\uff0c\u8f93\u51fa\u6d41\u6700\u540e\u4e00\u4e2aAVPacket\u7684pts\u901a\u8fc7\u51fd\u6570 av_stream_get_end_pts() \u83b7\u5f97\u3002<\/p>\n\n\n\n<p>\u8fd9\u6837\u5c31\u6bd4\u8f83\u597d\u7406\u89e3\u4e86\uff0c\u5982\u679c\u73b0\u5728\u5df2\u7ecf\u7f16\u7801\u5230\u89c6\u9891\u6d41\u7684\u7b2c10\u79d2\u7684\u6570\u636e\u5e27\uff0c\u4f46\u662f\u8f6c\u7801\u7a0b\u5e8f\u53ea\u8fd0\u884c\u4e862\u79d2\uff0c\u90a3speed\u8f6c\u7801\u901f\u5ea6\u5c31\u662f 10 \/2 \uff0cspeed\u7b49\u4e8e5.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg.c 1770\u884c\nspeed = t != 0.0 ? (double)pts \/ AV_TIME_BASE \/ t : -1;<\/code><\/pre>\n\n\n\n<p>print_report \u91cc\u9762 \u7684qp_hist \u8ddf AV_CODEC_FLAG_PSNR \u672c\u6b21\u4e0d\u8bb2\u89e3\uff0c\u56e0\u4e3a\u6211\u4e5f\u4e0d\u77e5\u9053\u662f\u505a\u4ec0\u4e48\u7684<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u6269\u5c55\u77e5\u8bc6\uff1a<\/p>\n\n\n\n<p>print_report \u91cc\u9762\u6709\u4e2a\u975e\u5e38\u6709\u7528\u7684\u51fd\u6570\uff0cavio_size(oc-&gt;pb)\uff0c \u53ef\u4ee5\u5f88\u65b9\u4fbf\u5f97\u83b7\u53d6 ffmpeg \u5df2\u7ecf\u5f80\u6587\u4ef6\u5199\u4e86\u591a\u5c11\u6570\u636e\u8fdb\u53bb\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002 \u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8 \u63d0\u53d6\u7801\uff1ag3k8 \u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ff [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,17],"tags":[],"class_list":["post-407","post","type-post","status-publish","format-standard","hentry","category-ffmpeg","category-ffmpeg-cmds"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - 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