{"id":489,"date":"2022-01-31T19:16:21","date_gmt":"2022-01-31T11:16:21","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=489"},"modified":"2022-09-28T21:42:09","modified_gmt":"2022-09-28T13:42:09","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-pause","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=489","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-pause"},"content":{"rendered":"\n<p>\u672c\u6587\u5185\u5bb9\u6709\u4e9b\u9519\u8bef\u7684\u5730\u65b9\uff0c\u66f4\u65b0\u7684\u6587\u7ae0\u8bf7\u770b\u300a<a href=\"https:\/\/ffmpeg.xianwaizhiyin.net\/ffplay\/pause.html\">FFplay\u6682\u505c\u5206\u6790<\/a>\u300b<\/p>\n\n\n\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>FFplay \u6e90\u7801\u5206\u6790\u7cfb\u5217\u4ee5\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u5f00\u59cb\uff0c<code class=\"prettyprint\" >ffplay -i a.mp4<\/code>\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>ffplay \u7684\u5927\u90e8\u5206\u4e3b\u8981\u903b\u8f91\u5df2\u7ecf\u8bb2\u5b8c\u4e86\uff0c\u672c\u6587\u4e3b\u8981\u8bb2\u89e3 ffpaly \u6682\u505c\u8ddf\u5f00\u59cb\u64ad\u653e\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff0c\u8fd8\u6709\u5728\u6682\u505c\u72b6\u6001\u4e0b\uff0c\u5404\u4e2a\u7ebf\u7a0b\u5728\u5e72\u4ec0\u4e48\u3002<\/p>\n\n\n\n<p>\u9996\u5148\u5206\u6790 read_thread() \u7ebf\u7a0b\u3002<\/p>\n\n\n\n<p>\u77e5\u9053\uff0cread_thread() \u7ebf\u7a0b \u4e3b\u8981\u505a\u7684\u4e8b\u60c5\u662f\u8bfb\u6587\u4ef6\uff0c\u8bfb\u51fapacket\uff0c\u7136\u540e\u63d2\u5165 PacketQueue \u961f\u5217\uff0c\u76f4\u5230\u63d2\u6ee1\u3002<\/p>\n\n\n\n<p>\u90a3 \u5982\u679c \u89c6\u9891\u64ad\u653e\u6682\u505c\u4e86\uff0cis-&gt;paused \u7f6e\u4e3a 1\u4e86\uff0c\u5bf9read_thread() \u4f1a\u6709\u54ea\u4e9b\u5f71\u54cd\u5462\uff1f<\/p>\n\n\n\n<p>\u56e0\u4e3a\u6211\u4eec\u7684\u547d\u4ee4\u662f\u64ad\u653e\u672c\u5730mp4 \uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b is-&gt;paused \u7f6e\u4e3a 1\uff0c\u5bf9read_thread() \u7684\u6d41\u7a0b\u6ca1\u6709\u5f71\u54cd\uff0cread_thread \u7ebf\u7a0b\u8fd8\u662f\u63d2\u6ee1 \u961f\u5217\uff0c\u7136\u540esleep 10ms\uff0c\u518d\u5c1d\u8bd5\u63d2\u961f\u5217\u3002<\/p>\n\n\n\n<p>\u518d\u770b\u770b audio_thread() \u89e3\u7801\u7ebf\u7a0b \u6709\u6ca1\u5f71\u54cd\uff0c<\/p>\n\n\n\n<p>is-&gt;paused \u7f6e\u4e3a 1 \u5bf9 audio_thread() \u89e3\u7801\u7ebf\u7a0b \u4e5f\u662f\u6ca1\u6709\u5f71\u54cd\u7684\uff0caudio_thread \u63d2\u6ee1 FrameQueue\u4e4b\u540e\uff0c\u5c31\u4f1a\u963b\u585e\u5728 frame_queue_peek_writable() \u91cc\u9762\u7b49\u5f85\u53ef\u5199\u3002<\/p>\n\n\n\n<p>video_thread \u89c6\u9891\u89e3\u7801\u7ebf\u7a0b\u4e5f\u662f\u4e00\u6837\uff0c\u63d2\u6ee1 FrameQueue\u4e4b\u540e\uff0c\u5c31\u4f1a\u963b\u585e\u5728 frame_queue_peek_writable() \u91cc\u9762\u7b49\u5f85\u53ef\u5199\u3002<\/p>\n\n\n\n<p>\u518d\u770b\u770b\u97f3\u9891\u64ad\u653e\u7ebf\u7a0b sdl_audio_callback \u6709\u6ca1\u5f71\u54cd\u3002<\/p>\n\n\n\n<p>sdl_audio_callback \u5728\u6682\u505c\u72b6\u6001\u4e0b\u7684\u5904\u7406\u8981\u4ed4\u7ec6\u7814\u7a76\u3002\u5148\u770b\u4ee3\u7801\u3002<\/p>\n\n\n\n<p>\u5728 audio_decode_frame() \u91cc\u7684\u903b\u8f91\u662f \u5982\u679c\u6682\u505c\u4e86\uff0c\u7acb\u5373\u8fd4\u56de -1\uff0caudio_decode_frame \u8fd4\u56de -1 \u5c31\u4f1a\u5bfc\u81f4 sdl_audio_callback() \u5f00\u59cb\u63d2\u5165\u9759\u97f3\u8f93\u5165\u5230 stream \u6307\u9488\u3002\u867d\u7136\u4ed6\u64ad\u653e\u7684\u9759\u97f3\u6570\u636e\uff0c\u4f46\u662f \u97f3\u9891\u65f6\u949f\u8fd8\u5728\u4e0d\u65ad\u66f4\u65b0\u3002set_clock_at() \u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570 pts \u867d\u7136\u6ca1\u53d8\u5316\uff0c\u4f46\u662f\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u7cfb\u7edf\u65f6\u95f4\u4e00\u76f4\u5728\u9012\u589e\u3002\u4e5f\u5c31\u8bf4\u5373\u4f7f\u6682\u505c\u4e86\uff0c\u97f3\u9891\u65f6\u949f\u4e5f\u662f\u4e00\u76f4\u5728\u8dd1\u7684\u3002\u5267\u900f\u4e00\u4e0b\uff0c\u4f46\u662f\u89c6\u9891\u65f6\u949f\u4e0d\u4e00\u6837\uff0c\u89c6\u9891\u65f6\u949f\u5728\u6682\u505c\u72b6\u6001\u4e0b\u4e0d\u8dd1\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" > if (!isnan(is-&gt;audio_clock)) {\n        set_clock_at(&amp;is-&gt;audclk,\n                     is-&gt;audio_clock - (double)(2 * is-&gt;audio_hw_buf_size + is-&gt;audio_write_buf_size) \/ is-&gt;audio_tgt.bytes_per_sec,\n                     is-&gt;audio_clock_serial, audio_callback_time \/ 1000000.0);\n        sync_clock_to_slave(&amp;is-&gt;extclk, &amp;is-&gt;audclk);\n}<\/code><\/pre>\n\n\n\n<p>\u518d\u770b\u770b\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b event_loop() \u6709\u6ca1\u5f71\u54cd\u3002<\/p>\n\n\n\n<p>event_loop \u7ebf\u7a0b\u662f\u8fd9\u6837\u7684\uff0c\u5373\u4f7f\u5728\u6682\u505c\u72b6\u6001\u4e0b\uff0crefresh_loop_wait_event \u91cc\u9762\u4e5f\u662f\u6bcf\u96940.01s\u5faa\u73af\u4e00\u6b21\u3002<\/p>\n\n\n\n<p>video_reflesh() \u5728\u6682\u505c\u72b6\u6001\u4e0b\u662f\u8fd9\u6837\u7684\uff0c\u76f4\u63a5 goto display\u4e86\uff0c\u6ca1\u6709\u6267\u884c\u540e\u9762\u7684 update_video_pts() \uff0c\u6240\u4ee5\u6211\u8bf4\uff0c\u5728\u6682\u505c\u72b6\u6001\u4e0b\uff0c\u89c6\u9891\u65f6\u949f\u6ca1\u6709\u8dd1\u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"829\" height=\"590\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-11-1.png\" alt=\"\" class=\"wp-image-491\"\/><\/figure>\n\n\n\n<p>\u5728\u6682\u505c\u72b6\u6001\u4e0b\uff0c\u97f3\u9891\u65f6\u949f\u4e00\u76f4\u5728\u8dd1\uff0c\u89c6\u9891\u65f6\u949f\u5374\u505c\u4e86\uff0c\u5982\u679c\u5f00\u59cb\u64ad\u653e\uff0c\u97f3\u9891\u65f6\u949f\u8ddf\u89c6\u9891\u65f6\u949f\u80af\u5b9a\u6709\u5f88\u5927\u7684\u4e0d\u540c\u6b65\uff0c\u6765\u770b\u770bffplay\u662f\u5982\u4f55\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"823\" height=\"315\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-11-2.png\" alt=\"\" class=\"wp-image-490\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u91cd\u65b0\u542f\u52a8\u7684\u65f6\u5019\uff0cffplay\u662f\u5355\u72ec\u5bf9\u89c6\u9891\u65f6\u949f\u505a\u4e86\u5904\u7406\u3002\u628a is-&gt;frame_timer \u8ddf is-&gt;vidclk \u90fd\u91cd\u65b0\u8bbe\u7f6e\u4e86\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 ffplay \u91cd\u65b0\u542f\u52a8\u64ad\u653e\u7684\u65f6\u5019\uff0c\u9700\u8981\u5bf9\u89c6\u9891\u65f6\u949f\u5355\u72ec\u641e\u8fd9\u4e48\u4e00\u51fa\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7b80\u5355\u603b\u7ed3\u4e00\u4e0b\uff0c\u6682\u505c\u72b6\u6001\u4e0b\u7684\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>read_thread()\uff0c\u6570\u636e\u8bfb\u53d6\u7ebf\u7a0b \u8fd8\u662f\u4e0d\u65ad\u8bfb packet\uff0c\u63d2\u6ee1\u961f\u5217\uff0c\u7136\u540esleep 10ms\uff0c\u518d\u5c1d\u8bd5\u63d2\u961f\u5217\u3002\u4e0d\u65ad\u7b49\u5f85\u961f\u5217\u53ef\u4ee5\u63d2\u5165\u6570\u636e\u3002<\/li><li>audio_thread()\uff0c \u97f3\u9891\u89e3\u7801\u7ebf\u7a0b\uff0c\u4e0d\u65ad\u89e3\u7801\u6570\u636e\uff0c\u63d2FrameQueue\uff0c\u63d2\u6ee1\u5c31\u505c\u5728 frame_queue_peek_writable() \u91cc\u9762\u7b49\u5f85\u961f\u5217\u6709\u7a7a\u4f4d\u53ef\u4ee5\u63d2\u5165\u3002<\/li><li>video_thread()\uff0c \u89c6\u9891\u89e3\u7801\u7ebf\u7a0b\uff0c\u4e0d\u65ad\u89e3\u7801\u6570\u636e\uff0c\u63d2FrameQueue\uff0c\u63d2\u6ee1\u5c31\u505c\u5728 frame_queue_peek_writable() \u91cc\u9762\u7b49\u5f85\u961f\u5217\u6709\u7a7a\u4f4d\u53ef\u4ee5\u63d2\u5165\u3002<\/li><li>sdl_audio_callback()\uff0c \u97f3\u9891\u64ad\u653e\u7ebf\u7a0b\uff0c\u6682\u505c\u72b6\u6001\u4f1a\u5199\u5165\u9759\u97f3\u6570\u636e\uff0c\u4f46\u662f\u6bcf\u6b21\u56de\u8c03\u90fd\u4f1a\u4fee\u6539\u97f3\u9891\u65f6\u949f\u7684\u7cfb\u7edf\u65f6\u95f4\uff0c\u5bfc\u81f4\u97f3\u9891\u65f6\u949f\u4e00\u76f4\u5728\u9012\u589e\u3002<\/li><li>video_reflesh()\uff0c\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\uff0c\u57fa\u672c\u4ec0\u4e48\u90fd\u6ca1\u505a\uff0c\u5728refresh_loop_wait_event \u91cc\u9762\u6bcf\u9694 0.01s \u5faa\u73af\u4e00\u6b21\uff0c\u5982\u679c\u7a97\u53e3\u6539\u53d8\uff0c\u9700\u8981\u91cd\u65b0\u6e32\u67d3SDL\uff0c\u4e5f\u53ea\u662f\u91cd\u65b0\u6e32\u67d3\uff0c\u4e0d\u4f1a\u6267\u884c update_video_pts() \u66f4\u65b0\u89c6\u9891\u65f6\u949f\u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>ffplay \u6e90\u7801\u5206\u6790\uff0cpause \u6682\u505c\u64ad\u653e\u5206\u6790\u5b8c\u6bd5\u3002<\/p>\n\n\n\n<p>\u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\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\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u5185\u5bb9\u6709\u4e9b\u9519\u8bef\u7684\u5730\u65b9\uff0c\u66f4\u65b0\u7684\u6587\u7ae0\u8bf7\u770b\u300aFFplay\u6682\u505c\u5206\u6790\u300b \u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d [&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-489","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-pause - \u5f26\u5916\u4e4b\u97f3<\/title>\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=489\" \/>\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-pause - \u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"og:description\" content=\"\u672c\u6587\u5185\u5bb9\u6709\u4e9b\u9519\u8bef\u7684\u5730\u65b9\uff0c\u66f4\u65b0\u7684\u6587\u7ae0\u8bf7\u770b\u300aFFplay\u6682\u505c\u5206\u6790\u300b \u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=489\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-31T11:16:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-09-28T13:42:09+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/.\/wp-content\/uploads\/2022\/01\/ffplay-11-1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"loken\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" 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