{"id":1548,"date":"2022-03-16T19:46:29","date_gmt":"2022-03-16T11:46:29","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1548"},"modified":"2024-02-01T18:53:52","modified_gmt":"2024-02-01T10:53:52","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-nobuffer","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1548","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-nobuffer"},"content":{"rendered":"\n<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.4 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e3b\u8981\u8bb2\u89e3 ffplay \u7684 RTMP \u534f\u8bae\u89e3\u6790\uff0c\u64ad\u653e\u3002\u672c\u6587\u4f7f\u7528\u7684\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffplay -fflags nobuffer -i rtmp:\/\/192.168.0.122\/live\/livestream<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u5728\u4f7f\u7528 FFplay \u64ad\u653e RTMP \u6d41\u7684\u65f6\u5019\uff0c\u5982\u679c \u4e0d\u5f00\u542f <code class=\"prettyprint\" >nobuffer<\/code> \u9009\u9879\uff0c\u753b\u9762\u5ef6\u8fdf\u4f1a\u9ad8\u8fbe 7 \u79d2\u5de6\u53f3\uff0c\u5f00\u542f\u4e86\uff0c\u5c40\u57df\u7f51\u5ef6\u8fdf\u53ef\u964d\u4f4e\u5230100\u6beb\u79d2\u5de6\u53f3\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\u672c\u6587\u4e3b\u8981\u7814\u7a76 <code class=\"prettyprint\" >nobuffer<\/code> \u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u4ee5\u53ca\u64ad\u653e\u7aef \u7f13\u5b58 7 \u79d2\u7684\u6570\u636e\u6709\u4f55\u4f5c\u7528\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >fflags<\/code> \u7684\u5b9a\u4e49\u5728 <code>libavformat\/options_table.h<\/code>\uff0c\u5982\u4e0b\u56fe\u4ee3\u7801\uff0c\u8fd9\u662f\u4e00\u4e2a\u901a\u7528\u9009\u9879\uff0c\u6240\u6709\u7684 \u89e3\u590d\u7528\u5668\u90fd\u6709\u8fd9\u4e2a\u9009\u9879\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"784\" height=\"370\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-1.png\" alt=\"\" class=\"wp-image-1552\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-1.png 784w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-1-300x142.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-1-768x362.png 768w\" sizes=\"auto, (max-width: 784px) 100vw, 784px\" \/><\/figure>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u4e2a\u547d\u4ee4\u884c\u53c2\u6570\uff0c\u662f\u5728\u8c03 <code class=\"prettyprint\" >avformat_open_input()<\/code> \u51fd\u6570\u7684\u65f6\u5019\u4e22\u8fdb\u53bb\u7684\uff0c\u6211\u4e3a\u4ec0\u4e48\u77e5\u9053\u662f\u5728\u8fd9\u4e2a\u5730\u65b9\u4e22\u8fdb\u53bb\u7684\uff1f\u8bf7\u770b\u4e4b\u524d\u7684\u4e13\u680f\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?cat=10\">FFplay\u6e90\u7801\u5206\u6790<\/a>\u300b\uff0c\u6240\u6709\u7684\u89e3\u590d\u7528\u53c2\u6570\uff0c\u4e5f\u53eb\u683c\u5f0f\u53c2\u6570\uff0c\u90fd\u662f\u5728 <code>avformat_open_input()<\/code> \u4e22\u8fdb\u53bb\u7684\u3002\u53ef\u4ee5\u770b\u4e0b\u56fe\u8bc1\u660e\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"965\" height=\"728\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-2.png\" alt=\"\" class=\"wp-image-1553\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-2.png 965w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-2-300x226.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-2-768x579.png 768w\" sizes=\"auto, (max-width: 965px) 100vw, 965px\" \/><\/figure>\n\n\n\n<p>\u8bb0\u5f97\u6539 Clion \u7684\u8c03\u8bd5\u53c2\u6570\uff0c\u628a <code class=\"prettyprint\" >-fflags nobuffer<\/code> \u52a0\u4e0a\u53bb\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u5728 <code class=\"prettyprint\" >avformat_open_input()<\/code> \u51fd\u6570\u5185\u90e8\uff0c\u4f1a\u628a <code>fflags<\/code> \u8fd9\u4e2a AVOption \u4e22\u7ed9 AVClass\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0cAVClass \u91cc\u9762\u5b58\u50a8\u4e86\u597d\u51e0\u4e2a AVOption \uff0cfflags \u8fd9\u4e2a AVOption \u7684\u4e0b\u6807\u662f 5 \uff0c\u524d\u9762\u7684\u662f \u9ed8\u8ba4\u7684\u9009\u9879\uff0c\u81ea\u52a8\u52a0\u8fdb\u53bb\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"942\" height=\"638\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-3.png\" alt=\"\" class=\"wp-image-1554\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-3.png 942w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-3-300x203.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-3-768x520.png 768w\" sizes=\"auto, (max-width: 942px) 100vw, 942px\" \/><\/figure>\n\n\n\n<p>\u6ce8\u610f \uff0c<code class=\"prettyprint\" >av_opt_set_dict()<\/code> \u8fd9\u4e2a\u51fd\u6570\u4f1a\u6539\u53d8 <code>tmp<\/code> \u7684\u503c\uff0c\u628a\u80fd\u7528 \u9009\u9879\u5e94\u7528\u4e4b\u540e\u5254\u9664\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><code class=\"prettyprint\" >nobuffer<\/code> \u8fd9\u4e2a\u53c2\u6570 \u4f20\u9012\u8fc7\u7a0b\u4e2d\u7684\u51fd\u6570\u8c03\u7528\u6709\u70b9\u957f\uff0c\u63a8\u8350\u770b\u4e4b\u524d\u7684\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?cat=14\">FFmpeg\u6e90\u7801\u5206\u6790-\u53c2\u6570\u89e3\u6790\u7bc7<\/a>\u300b\uff0c\u539f\u7406\u7c7b\u4f3c\uff0c\u6211\u77e5\u9053\u8fd9\u4e2a \u53c2\u6570\u6700\u540e\u4f1a\u8d4b\u503c\u5230 <code>struct AVFormatContext<\/code> \u7684 <code>flags<\/code> \u5b57\u6bb5\u91cc\u9762\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"915\" height=\"436\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-4.png\" alt=\"\" class=\"wp-image-1555\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-4.png 915w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-4-300x143.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-4-768x366.png 768w\" sizes=\"auto, (max-width: 915px) 100vw, 915px\" \/><\/figure>\n\n\n\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6240\u4ee5 <code class=\"prettyprint\" >avformat_open_input()<\/code> \u51fd\u6570\u6267\u884c\u5b8c\u4e4b\u540e <code>AVFormatContext::flags<\/code> \u7684\u7b2c7\u4f4d\u5e94\u8be5\u4f1a\u88ab\u7f6e\u4e3a1\uff0c\u56e0\u4e3a 0x40 \u7684\u4e8c\u8fdb\u5236\u662f 1000000\u3002\u8bf7\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"965\" height=\"714\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-5.png\" alt=\"\" class=\"wp-image-1550\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-5.png 965w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-5-300x222.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-5-768x568.png 768w\" sizes=\"auto, (max-width: 965px) 100vw, 965px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c <code class=\"prettyprint\" >ic-&gt;flags<\/code> \u76f4\u63a5\u5c31\u662f 64 \uff0c\u4e5f\u5c31\u662f 16 \u8fdb\u5236\u7684 0x40\u3002\u6240\u4ee5\u4e0a\u9762\u7684\u5206\u6790\u6ca1\u9519\u3002 <code>avformat_open_input()<\/code> \u51fd\u6570\u53ea\u662f\u628a \u547d\u4ee4\u884c\u53c2\u6570\u89e3\u6790 \u5230\u8fd9\u4e2a <code>flags<\/code> \u5b57\u6bb5\uff0c\u4f46\u662f\u771f\u6b63\u4f7f\u7528\u8fd9\u4e2a\u5b57\u6bb5 \u662f\u5728 <code>avformat_find_stream_info()<\/code> \u91cc\u9762\u3002\u76f4\u63a5\u641c <code>AVFMT_FLAG_NOBUFFER<\/code> \u5c31\u80fd\u627e\u5230\u4f7f\u7528\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >avformat_find_stream_info()<\/code> \u51fd\u6570\u7684\u5185\u90e8\u903b\u8f91\u5b9e\u9645\u4e0a\u975e\u5e38\u590d\u6742\uff0c\u6211\u76f4\u63a5\u8bb2\u91cd\u70b9\u4ee3\u7801\uff0c\u5982\u4e0b:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >if (!(ic-&gt;flags &amp; AVFMT_FLAG_NOBUFFER)) {\n    ret = avpriv_packet_list_put(&amp;ic-&gt;internal-&gt;packet_buffer,\n                                        &amp;ic-&gt;internal-&gt;packet_buffer_end,\n    pkt1, NULL, 0);\n    if (ret &lt; 0)\n        goto unref_then_goto_end;\n\u200b\n    pkt = &amp;ic-&gt;internal-&gt;packet_buffer_end-&gt;pkt;\n} else {\n    pkt = pkt1;\n}<\/code><\/pre>\n\n\n\n<p><code class=\"prettyprint\" >AVFMT_FLAG_NOBUFFER<\/code> \u6807\u8bb0 \u5982\u679c\u6ca1\u8bbe\u7f6e\uff0c\u5c31\u4f1a\u5bfc\u81f4 \u63a2\u6d4b\u7684\u6570\u636e\u5305\u4e22\u8fdb\u53bb\u961f\u5217\uff0c\u6211\u4eec\u77e5\u9053 <code>avformat_find_stream_info()<\/code> \u4f1a\u5148\u8bfb\u4e00\u6bb5\u6570\u636e\u5305\u5206\u6790\u51fa\u6d41\u662f\u4ec0\u4e48\u7f16\u7801\u5668\u4e4b\u7c7b\u7684\uff0c\u4e3a\u4e86\u91cd\u7528\u8fd9\u4e2a \u63a2\u6d4b\u7684\u6570\u636e\u5305\uff0c\u8fd9\u91cc\u5c31\u4f1a\u4e22\u8fdb\u53bb\u961f\u5217\uff0c\u64ad\u653e\u7684\u65f6\u5019\uff0c\u5c31\u4ece\u8fd9\u4e9b\u6570\u636e\u5305\u5f00\u59cb\uff0c\u4f46\u662f\u6574\u4e2a\u63a2\u6d4b\u8fc7\u7a0b\uff0c\u957f\u8fbe 5\u79d2\uff0c\u4e5f\u5c31\u662f ffplay \u5927\u6982\u4f1a\u8bfb 5\u79d2\u7684\u6570\u636e\uff0c\u6765\u5206\u6790\u8f93\u5165\u6d41\u7684\u60c5\u51b5\u3002\u5982\u679c\u5f00\u542f nobuffer\uff0c\u5c31\u4e0d\u4f1a\u91cd\u7528\u8fd9\u4e9b\u63a2\u6d4b\u6570\u636e\uff0cffpaly \u63a2\u6d4b\u5b8c\u8f93\u5165\u6d41\u4e4b\u540e\uff0c\u5c31\u4f1a\u91cd\u65b0\u8bfb\u53d6\u65b0\u7684\u6570\u636e\u5305\u6765\u64ad\u653e\u3002\u4e0d\u7528\u7f13\u5b58\u7684\uff0c\u6240\u4ee5\u5ef6\u8fdf\u5c31\u4f4e\u4e86\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u56fe\uff0c\u6211\u5728 ffpaly.c \u7684 <code class=\"prettyprint\" >avformat_find_stream_info()<\/code> \u524d\u540e\u8f93\u51fa\u4e86\u4e2a\u65f6\u95f4\uff0c\u6b63\u597d\u76f8\u5dee5\u79d2\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >double start_time3 = av_gettime_relative() \/ 1000000.0;\nif (find_stream_info) {\n    ...\u7701\u7565\u4ee3\u7801...\n    err = avformat_find_stream_info(ic, opts);\n    ...\u7701\u7565\u4ee3\u7801...\n}\ndouble end_time3 = av_gettime_relative() \/ 1000000.0;\nprintf(&quot;start is %f , end is %f \\r\\n&quot;,start_time3,end_time3);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"877\" height=\"508\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-6.png\" alt=\"\" class=\"wp-image-1551\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-6.png 877w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-6-300x174.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-24-6-768x445.png 768w\" sizes=\"auto, (max-width: 877px) 100vw, 877px\" \/><\/figure>\n\n\n\n<p>\u6240\u4ee5\u5b9e\u9645\u4e0a <code class=\"prettyprint\" >ffplay<\/code> \u5728 \u5b9e\u65f6\u7684\u573a\u666f\u4e0b\uff0c\u7f13\u5b58\u662f\u4e2a\u9e21\u808b\uff0c\u672c\u6765\u8fd9\u4e2a buffer \u529f\u80fd\u662f\u4e3a\u4e86\u5206\u6790\u672c\u5730\u6587\u4ef6\uff0c\u907f\u514d\u91cd\u590d\u8bfb\u53d6\uff0c\u4f46\u662f\u5f71\u54cd\u5230\u4e86\u5b9e\u65f6\u7684\u573a\u666f\u3002\u5b9e\u65f6\u573a\u666f\u5fc5\u987b\u628a buffer \u5173\u6389\u3002<\/p>\n\n\n\n<p>\u8865\u5145\uff0c\u56e0\u4e3a\u6211\u662f\u865a\u62df\u673a\u505a\u670d\u52a1\u5668\uff0c\u6240\u4ee5\u90fd\u662f\u672c\u673a\u901a\u4fe1\uff0c\u4e0d\u542f\u7528 buffer \u4e5f\u80fd\u5f88\u6d41\u7545\uff0c\u4f46\u662f\u5982\u679c\u6211\u628a SRS \u90e8\u7f72\u5728\u5c40\u57df\u7f51\u53e6\u4e00\u53f0\u673a\u5668\uff0c\u4e0d\u5f00\u542f buffer \uff0c\u89c6\u9891\u6709\u5361\u987f\uff0c\u4f30\u8ba1\u662f\u8fd8\u6ca1\u6765\u5f97\u53ca\u89e3\u7801\u4e22\u8fdb\u53bb\u961f\u5217\uff0c\u6240\u4ee5 ffplay \u4e0d\u65ad\u4e22\u5f03\u89c6\u9891\u5e27\u3002\u56e0\u4e3a\u89c6\u9891\u6bd4\u97f3\u9891\u6162\u4e86\uff0c\u5f97\u4e22\u5f03\u3002<\/p>\n\n\n\n<p>\u76f8\u5173\u9605\u8bfb<\/p>\n\n\n\n<p>1\uff0c<a href=\"https:\/\/mp.weixin.qq.com\/s\/VibdYJYz_b_BCNqaF2h-Pw\">\u300aFFmpeg \u6846\u67b6\u7b80\u8bfb-Demux \u90e8\u5206\u300b<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\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\u6216\u8005\u5e0c\u671b\u4ea4\u6d41\u97f3\u89c6\u9891\u6280\u672f\u7684\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.4 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e3b\u8981\u8bb2\u89e3 ffplay \u7684 RTMP \u534f\u8bae\u89e3\u6790\uff0c\u64ad\u653e\u3002\u672c\u6587\u4f7f\u7528\u7684\u547d\u4ee4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-1548","post","type-post","status-publish","format-standard","hentry","category-ffplay"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FFplay\u6e90\u7801\u5206\u6790-nobuffer - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"description\" content=\"FFplay\u6e90\u7801\u5206\u6790-nobuffer\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xianwaizhiyin.net\/?p=1548\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FFplay\u6e90\u7801\u5206\u6790-nobuffer - 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