{"id":479,"date":"2022-01-31T19:09:22","date_gmt":"2022-01-31T11:09:22","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=479"},"modified":"2022-06-25T20:19:43","modified_gmt":"2022-06-25T12:19:43","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-%e9%9f%b3%e8%a7%86%e9%a2%91%e5%90%8c%e6%ad%a52","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=479","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-\u97f3\u89c6\u9891\u540c\u6b652"},"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>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>\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5df2\u7ecf\u8bb2\u89e3\u5b8c \u97f3\u9891\u64ad\u653e\u7ebf\u7a0b\u51fd\u6570 sdl_audio_callback() \u5185\u90e8\u903b\u8f91\uff0c\u672c\u7bc7\u6587\u7ae0\u5f00\u59cb\u8bb2\u89e3 \u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\u7684\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n<p>\u97f3\u89c6\u9891\u540c\u6b65\u65b9\u5f0f\u662f AV_SYNC_AUDIO_MASTER\uff0c\u4ee5\u97f3\u9891\u4e3a\u4e3b\u65f6\u949f\uff0c\u672c\u6587\u57fa\u4e8e\u8fd9\u79cd\u540c\u6b65\u65b9\u5f0f\u505a\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u5c31\u662f main() -&gt; event_loop()\u3002\u5c31\u662f\u4e3b\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u5f00\u59cb\u5206\u6790 event_loop() \u7684\u5185\u90e8\u903b\u8f91\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=\"1172\" height=\"982\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-9-1.png\" alt=\"\" class=\"wp-image-481\"\/><\/figure>\n\n\n\n<p>event_loop() \u91cc\u9762\u7684\u903b\u8f91\u662f\u8fd9\u6837\u7684\uff0c\u5728\u6b7b\u5faa\u73af\u91cc\u9762\u7b49\u5f85\u952e\u76d8\u4e8b\u4ef6\u51fa\u73b0\uff0c\u5982\u679c\u6ca1\u6709\u952e\u76d8\u4e8b\u4ef6\uff0c\u5c31\u6267\u884c video_refresh() \u64ad\u653e\u89c6\u9891\u5e27\u3002\u4e8b\u4ef6\u5904\u7406\u7684\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\uff0c\u8fd9\u91cc\u5c31\u4e0d\u4ed4\u7ec6\u5206\u6790\u4e86\u3002\u4e0b\u9762\u76f4\u63a5\u4ece video_refresh() \u89c6\u9891\u64ad\u653e \u5f00\u59cb\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>video_refresh() \u91cc\u9762\u64ad\u653e\u89c6\u9891\u5e27\u7684\u903b\u8f91\u6bd4\u8f83\u5947\u602a\uff0c\u5b83\u662f\u5148\u7528 frame_queue_next() \u504f\u79fb FrameQueue \u961f\u5217\u7684\u8bfb\u7d22\u5f15 rindex\uff0c\u518d\u6267\u884c video_display() \u6765\u663e\u793a\u4e0a\u4e00\u5e27\u7684\u6570\u636e\u3002\u56e0\u4e3a\u5df2\u7ecf\u504f\u79fb\u4e86 rindex\uff0c\u6240\u4ee5\u5f85\u64ad\u653e\u5e27\u5c31\u53d8\u6210\u4e86\u4e0a\u4e00\u5e27\u3002<\/p>\n\n\n\n<p>ffplay \u5b83\u4e0d\u662f\u5148\u64ad\u653e\u89c6\u9891\u5e27\uff0c\u518d\u504f\u79fb \u8bfb\u7d22\u5f15 rindex\u3002\u5b83\u8fd9\u6837\u662f\u4e3a\u4e86\u53ef\u4ee5\u901a\u7528\u4e00\u4e9b\u903b\u8f91\uff0c\u4f8b\u5982\u6682\u505c\u7684\u65f6\u5019\uff0c\u7f29\u5c0f\u64ad\u653e\u7a97\u53e3\uff0c\u4e5f\u9700\u8981\u8c03 video_display() \u6765\u5237\u65b0\u4e0a\u4e00\u5e27\u6570\u636e\u5230SDL texture\u5185\u5b58\uff0c\u4f46\u662f\u5374\u4e0d\u7528\u504f\u79fb \u8bfb\u7d22\u5f15rindex\uff0c\u53ef\u4ee5\u8df3\u8fc7 \u504f\u79fbrindex\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-alpha-channel-opacity\"\/>\n\n\n\n<p>video_refresh() \u91cc\u9762\u8fd8\u6709\u4e24\u4e2a\u91cd\u70b9\u9700\u8981\u8bb2\u89e3\uff1a<\/p>\n\n\n\n<p>1\uff0cis-&gt;frame_timer \u8ddf is-&gt;force_refresh \u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n<p>is-&gt;frame_timer \u53ef\u4ee5\u7406\u89e3\u4e3a \u7a97\u53e3\u6b63\u5728\u663e\u793a\u7684\u5e27 \u7684\u64ad\u653e\u65f6\u523b\uff0c\u5c31\u662f\u8bf4\u8fd9\u5e27\u662f\u5728\u4ec0\u4e48\u7cfb\u7edf\u65f6\u95f4\u64ad\u653e\u7684\uff0c\u97f3\u89c6\u9891\u540c\u6b65\u4f1a\u7528\u5230\u7cfb\u7edf\u65f6\u95f4\u4f5c\u4e3a\u523b\u5ea6\u8868\u3002\u8fd9\u4e2a is-&gt;frame_timer \u8868\u793a\u7684\u5c31\u662f \u5728 14:00 \uff08\u4e0b\u53482\u70b9\uff09\u7684\u65f6\u5019\uff0c\u64ad\u653e\u4e86 \u7b2c\u4e8c\u5e27\u89c6\u9891\uff0c\u7b2c\u4e8c\u5e27\u7684 pts \u662f2\u3002\u8fd9\u91cc\u4e3a\u4ec0\u4e48\u4e0d\u7528 clock \u91cc\u9762\u7684\u65f6\u95f4\uff1f\u6211\u518d\u60f3\u60f3\u3002<\/p>\n\n\n\n<p>is-&gt;force_refresh \u63a7\u5236\u662f\u5426\u9700\u8981\u8c03\u7528 video_display()\u3002video_display \u7684\u4f5c\u7528\u662f \u7528 AVFrame:: data \u91cd\u65b0\u6e32\u67d3SDL render\u3002\u5728 reflesh_loop_wait_event() \u91cc\u9762\u5faa\u73af\u7684\u65f6\u5019\uff0cremaining_time \u88ab\u8d4b\u503c\u4e3a REFRESH_RATE\uff0c\u4e5f\u5c31\u8bf4\u81f3\u5c11\u7ecf\u5386 0.01s \u5faa\u73af\u4e00\u6b21\u3002\u4f46\u4e3a\u4e86\u964d\u4f4e\u6e32\u67d3\u9891\u7387\uff0c\u4e0d\u662f\u6bcf 0.01s \u79d2\u5c31\u53d6\u4e0a\u4e00\u5e27\u6e32\u67d3\u5230SDL\u3002\u5728\u8c03 video_display() \u4e4b\u524d\uff0c\u662f\u7528\u4e86\u4e00\u4e2a\u5224\u65ad\uff0c\u6211\u6d41\u7a0b\u56fe\u6ca1\u753b\u51fa\u6765\uff0c\u8bf7\u770b\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >if (!display_disable &amp;&amp; is-&gt;force_refresh &amp;&amp; is-&gt;show_mode == SHOW_MODE_VIDEO &amp;&amp; is-&gt;pictq.rindex_shown)\n            video_display(is);<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684 if \u6761\u4ef6\uff0c\u6700\u91cd\u8981\u7684\u662f force_refresh\uff0c\u662f\u5426\u9700\u8981\u6e32\u67d3\u3002force_refresh \u6709\u51e0\u4e2a\u573a\u666f\u7684\u8d4b\u503c\u53d8\u5316\uff0c\u5982\u4e0b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>video_reflesh \u91cc\u9762 \u987a\u5229\u62ff\u5230 \u4e0b\u4e00\u5e27\uff0cforce_reflesh \u7f6e\u4e3a1\u3002<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffplay.c 1680\u884c\nframe_queue_next(&amp;is-&gt;pictq);\nis-&gt;force_refresh = 1;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7a97\u53e3\u7f29\u653e\u4e8b\u4ef6\uff0c\u9700\u8981\u91cd\u65b0\u6e32\u67d3\u3002<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >case SDL_WINDOWEVENT_EXPOSED:\n     cur_stream-&gt;force_refresh = 1;<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u5728 video_display() \u4e4b\u540e\uff0c\u8fd8\u4f1a\u628a force_refresh \u6539\u56de\u53bb\u62100\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\u3002\u5728\u6682\u505c\u72b6\u6001\u4e0b\uff0c\u7a97\u53e3\u5927\u5c0f\u6ca1\u53d8\uff0c\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b event_loop \u662f\u4e0d\u4f1a\u6bcf\u96940.01s \u5c31\u53d6\u4e0a\u4e00\u5e27\u6e32\u67d3SDL\u7684\uff0c\u56e0\u4e3a\u6ca1\u5fc5\u8981\u3002\u8fd9\u4e5f\u5c31\u662f\u4e4b\u524d\u6587\u7ae0\u6240\u8bf4\u7684\uff0cFrameQueue \u91cc\u9762\u7684 keep_last \u8ddf index_shown \u7684\u4f5c\u7528\uff0c\u4fdd\u7559\u4e0a\u4e00\u5e27\u5728\u961f\u5217\u4e0d\u9500\u6bc1\u3002<\/p>\n\n\n\n<p>2\uff0c<strong>compute_target_delay()<\/strong>\uff0c\u8ba1\u7b97\u51fa\u7a97\u53e3\u6b63\u5728\u663e\u793a\u7684\u5e27\u9700\u8981\u6301\u7eed\u663e\u793a\u591a\u4e45\u3002<\/p>\n\n\n\n<p><strong>compute_target_delay<\/strong> \u662f video_refresh() \u91cc\u9762\u6700\u91cd\u8981\u7684\u51fd\u6570\uff0c\u89c6\u9891\u5411\u97f3\u9891\u540c\u6b65\u7684\u7b97\u6cd5\uff0c\u5c31\u662f\u5728\u8fd9\u91cc\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u547d\u4ee4\u662f\u4ee5\u97f3\u9891\u4e3a\u4e3b\u65f6\u949f\u7684\uff0ccompute_target_delay \u7684\u4ee3\u7801\u4e0d\u8fc7\u51e0\u5341\u884c\uff0c\u4f46\u6bcf\u4e00\u884c\u4ee3\u7801\u90fd\u6bd4\u8f83\u590d\u6742\u3002\u4e0b\u9762\u5f00\u59cb\u8bb2\u89e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >diff = get_clock(&amp;is-&gt;vidclk) - get_master_clock(is);<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u884c\u4ee3\u7801 \u662f\u8ba1\u7b97 \u89c6\u9891\u65f6\u949f \u4e0e \u97f3\u9891\u65f6\u949f\u7684\u5dee\u5f02\uff0c diff \u5927\u4e8e 0 \u4ee3\u8868 \u89c6\u9891 \u6bd4 \u97f3\u9891 \u64ad\u653e\u5feb\u4e86\uff0c diff \u5c0f\u4e8e 0 \u4ee3\u8868 \u89c6\u9891 \u6bd4 \u97f3\u9891 \u64ad\u653e\u6162\u4e86\uff0cdiff \u7684\u5355\u4f4d\u662f\u79d2\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8fd9\u4e24\u4e2a\u65f6\u949f\u76f8\u51cf\u5c31\u80fd\u5f97\u51fa\uff0c\u89c6\u9891\u6bd4\u97f3\u9891\u5feb\u591a\u5c11\uff0c\u6216\u8005\u6162\u591a\u5c11\u5462\uff1f\u8fd9\u4e2a\u95ee\u9898\u9700\u8981\u4ed4\u7ec6\u7814\u7a76\u4e00\u4e0b struct Clock \u7684\u7ed3\u6784\u4ee5\u53ca\u8d4b\u503c\u573a\u666f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >static void set_clock(Clock *c, double pts, int serial)\n{\n    double time = av_gettime_relative() \/ 1000000.0; \/\/\u6ce8\u610f\u8fd9\u91cc\n    set_clock_at(c, pts, serial, time);\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >typedef struct Clock {\n    double pts;           \/* clock base *\/\n    double pts_drift;     \/* clock base minus time at which we updated the clock *\/\n    double last_updated;\n    double speed;\n    int serial;           \/* clock is based on a packet with this serial *\/\n    int paused;\n    int *queue_serial;    \/* pointer to the current packet queue serial, used for obsolete clock detection *\/\n} Clock;<\/code><\/pre>\n\n\n\n<p>struct Clock \u91cc\u9762\u6700\u91cd\u8981\u7684\u5b57\u6bb5\u5c31\u662f pts \u8ddf pts_drift\uff0c\u4ed6\u4eec\u7684\u5355\u4f4d\u90fd\u662f\u79d2\uff0cpts_drift = pts - last_updated\u3002<\/p>\n\n\n\n<p>pts \u5b58\u7684\u662f\u89c6\u9891\u5e27AVFrame\u7684pts\uff0clast_updated \u662f\u901a\u8fc7 av_gettime_relative() \u5f97\u5230\u7684\uff0c\u6240\u4ee5 pts_drift \u8ba1\u7b97\u51fa\u6765\u7684\u503c\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u8d1f\u6570\u3002<\/p>\n\n\n\n<p>\u4e00\u4e2a\u5f88\u5927\u7684\u8d1f\u6570\uff0c\u5176\u5b9e\u770b\u4e0d\u51fa pts_drift \u8981\u5b9e\u73b0\u7684\u529f\u80fd\u3002\u6211\u6539\u52a8\u4e00\u4e0b pts_drift \u7684\u5b9e\u73b0\uff0c\u8ba9\u4ed6\u7684\u529f\u80fd\u66f4\u5bb9\u6613\u660e\u767d\u3002<\/p>\n\n\n\n<p>\u5728main() \u5165\u53e3\u7684\u65f6\u5019\uff0c\u52a0\u4e00\u53e5\u4ee3\u7801 strat_time = av_gettime_relative() \uff0c\u7528 av_gettime_relative() \u83b7\u53d6\u4e00\u4e2a\u7a0b\u5e8f\u542f\u52a8\u7684\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u7136\u540e <strong>pts_drift = pts - last_updated - strat_time<\/strong> \uff0c\u56e0\u4e3a last_updated \u662f\u7528 av_gettime_relative() \u83b7\u53d6\u7684\u6700\u65b0\u7684\u65f6\u95f4\u3002\u6240\u4ee5\u8fd8\u53ef\u4ee5\u7b80\u5199\u6210\u8fd9\u6837\u3002<\/p>\n\n\n\n<p><strong>pts_drift = pts - (av_gettime_relative() - strat_time)<\/strong> \uff0c \u4e5f\u5c31\u662f pts_drift = pts - \u7cfb\u7edf\u6d88\u901d\u7684\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u6ca1\u9519\uff0c pts_drift \u7684\u5b9e\u9645\u610f\u4e49\u5c31\u662f \u89c6\u9891\u5e27\u7684 pts \u4e0e\u5f53\u524d\u7cfb\u7edf\u6d88\u901d\u65f6\u95f4\u7684\u5dee\u8ddd\u3002\u89c6\u9891\u4e2d\u7684pts\u7684\u5355\u4f4d\u662f\u79d2\u3002<\/p>\n\n\n\n<p>\u4ec0\u4e48\u662f\u7cfb\u7edf\u6d88\u901d\u65f6\u95f4\uff0c\u8fd8\u662f\u7528 a.mp4 \u4e3e\u4f8b\uff0ca.mp4 \u662f24\u5e27\u7684\u89c6\u9891\uff0c\u4e5f\u5c31\u662f\u6bcf\u9694 0.04 \u79d2\u64ad\u653e\u4e00\u5e27\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728main()\u5f00\u59cb\u6267\u884c\u540e\uff0c\u8fc7\u4e860.04s \u5c31\u5e94\u8be5\u64ad\u653e\u7b2c\u4e00\u5e27\u89c6\u9891\uff0c\u8fc7\u4e86 0.08s \u5c31\u5e94\u8be5\u64ad\u653e\u7b2c\u4e8c\u5e27\u89c6\u9891\u30020.04 \u8ddf 0.08 \u5c31\u662f av_gettime_relative() - strat_time \u5f97\u5230\u7684\u3002\u89c6\u9891\u5e27\u7684AVFrame\u7684pts\u80af\u5b9a\u662f 0.04s\uff0c0.08s\u7684\u503c\uff0c\u4f46\u662f\uff0c\u4f46\u662f av_gettime_relative() - strat_time \u4e0d\u4e00\u5b9a\u5c31\u662f 0.04 \u6216\u8005 0.08 \u4e4b\u7c7b\u7684\uff0c\u56e0\u4e3a\u7cfb\u7edf\u5361\u987f\u7b49\u7b49\u56e0\u7d20\uff0c\u53ef\u80fd \u57280.05\u79d2\u7684\u65f6\u5019\u624d\u64ad\u653e\u7b2c\u4e00\u5e27\uff0c\u4e5f\u5c31\u662f av_gettime_relative() - strat_time = 0.05s \u7684\u65f6\u5019\u64ad\u653e\u7b2c\u4e00\u5e27\uff0c\u6b64\u65f6\u6b64\u523b\uff0c\u89c6\u9891\u7684 pts_drift \u662f\u4e0d\u662f\u7b49\u4e8e <strong>0.04 -0.05 = -0.01<\/strong>\uff0c\u4e5f\u5c31\u662f\u8bf4\u89c6\u9891\u64ad\u653e\u6bd4\u7cfb\u7edf\u65f6\u95f4\u6162\u4e86 0.01s \u79d2\u3002\u6ca1\u9519\uff0c\u97f3\u89c6\u9891\u540c\u6b65\u91cc\u9762 \u7cfb\u7edf\u65f6\u95f4\u662f\u4e00\u4e2a\u57fa\u51c6\u3002<\/p>\n\n\n\n<p>\u97f3\u9891\u7684 pts_drift \u540c\u7406\uff0c\u4e5f\u662f\u4ee3\u8868\u97f3\u9891\u5e27pts\u8ddf\u7cfb\u7edf\u65f6\u95f4\u7684\u5dee\u8ddd\uff0c\u5f53\u524d\u64ad\u653e\u7684\u97f3\u9891\u5e27\u6bd4\u7cfb\u7edf\u65f6\u95f4\u6162\u591a\u5c11\u6216\u8005\u5feb\u591a\u5c11\u3002<\/p>\n\n\n\n<p>\u5982\u679c \u97f3\u9891\u7684 pts_drift \u662f 0.03s\uff0c\u97f3\u9891\u5e27pts\u6bd4\u7cfb\u7edf\u65f6\u95f4\u5feb0.03s\u79d2\u3002<\/p>\n\n\n\n<p>\u5982\u679c \u89c6\u9891\u7684 pts_drift \u662f -0.01s\uff0c\u89c6\u9891\u5e27pts\u6bd4\u7cfb\u7edf\u65f6\u95f4\u61620.01s\u79d2\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >diff = get_clock(&amp;is-&gt;vidclk) - get_master_clock(is);<\/code><\/pre>\n\n\n\n<p>\u90a3\u6b64\u65f6 compute_target_delay() \u91cc\u9762\u8ba1\u7b97\u7684 diff \u5c31\u662f -0.04s\uff0c\u89c6\u9891\u6bd4\u97f3\u9891\u6162 0.04s \u79d2\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u518d\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u8fd8\u662f \u64ad\u653e a.mp4\uff0c\u97f3\u9891\u6bcf\u9694 0.02s \u64ad\u653e\u4e00\u5e27\uff0c\u89c6\u9891\u6bcf\u9694 0.04s \u64ad\u653e\u4e00\u5e27\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><\/th><th>\u97f3\u9891<\/th><th>\u89c6\u9891<\/th><\/tr><\/thead><tbody><tr><td>\u7b2c\u4e00\u5e27<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>\u7b2c\u4e8c\u5e27<\/td><td>0.02<\/td><td>0.04 (14:00:00:09)<\/td><\/tr><tr><td>\u7b2c\u4e09\u5e27<\/td><td>0.04<\/td><td>0.08<\/td><\/tr><tr><td>\u7b2c\u56db\u5e27<\/td><td>0.06<\/td><td>0.12<\/td><\/tr><tr><td>\u7b2c\u4e94\u5e27<\/td><td>0.08 (14:00:00:10)<\/td><td>0.16<\/td><\/tr><tr><td>\u7b2c\u516d\u5e27<\/td><td>0.10<\/td><td>0.20<\/td><\/tr><tr><td>\u7b2c\u4e03\u5e27<\/td><td>0.12(14:00:00:14)<\/td><td>0.24<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5728 14:00:00 \uff08\u4e0b\u53482\u70b9\uff09\u7684\u65f6\u5019\u5f00\u59cb\u6267\u884cmain()\u51fd\u6570\uff0c\u8fc7\u4e860.1s \u5230 14:00:00:10 \u7684\u65f6\u5019\uff0c\u97f3\u9891\u5df2\u7ecf\u64ad\u653e\u5230\u7b2c5\u5e27\uff0c\u97f3\u9891\u7684\u7b2c5\u5e27\u7684pts\u662f0.08s\uff0c\u6240\u4ee5\u97f3\u9891\u6bd4\u7cfb\u7edf\u65f6\u95f4\u6162\u4e860.02s\uff0c\u4e3a\u4ec0\u4e48\u6162\u662f\u56e0\u4e3a\u7cfb\u7edf\u5361\u987f\u3002\u7136\u540e\u89c6\u9891\u7684\u7b2c3\u5e27\u7684pts\u4e5f\u662f0.08\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u97f3\u89c6\u9891\u5b8c\u5168\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\uff0c\u64ad\u653e\u5b8c\u97f3\u9891\u7684\u7b2c5\u5e27\u4e4b\u540e\uff0c\u9700\u8981\u7acb\u5373\u64ad\u653e\u89c6\u9891\u7684\u7b2c\u4e09\u5e27\uff0c\u8fd9\u6837\u624d\u662f\u5b8c\u5168\u540c\u6b65\uff0c\u4f46\u662f \u89c6\u9891\u7684\u7b2c\u4e8c\u5e27\u662f\u5728 14:00:00:09 \u7684\u65f6\u5019\u624d\u64ad\u653e\u7684\uff0c\u6309\u5e27\u7387\u64ad\u653e\uff0c\u89c6\u9891\u7b2c\u4e8c\u5e27\u672c\u6765\u5e94\u8be5\u5728 14:00:00:04 \u7684\u65f6\u5019\u64ad\u653e\u7684\uff0c\u5728 00:09 \u624d\u64ad\u653e\u7b2c\u4e8c\u5e27\uff0c\u8bf4\u660e\u89c6\u9891\u7684\u64ad\u653e\u6162\u4e8e\u7cfb\u7edf\u65f6\u95f4 0.05s\uff0c<\/p>\n\n\n\n<p>\u89c6\u9891\u7684\u64ad\u653e\u6162\u4e8e\u7cfb\u7edf\u65f6\u95f4 0.05s\uff0c\u97f3\u9891\u6bd4\u7cfb\u7edf\u65f6\u95f4\u6162\u4e860.02s\uff0c\u90a3\u5c31\u662f \u89c6\u9891\u6bd4\u97f3\u9891\u6162 0.03s\u79d2\uff0c\u6240\u4ee5\u5728 14:00:00:09 \u64ad\u653e\u7b2c\u4e8c\u5e27\u89c6\u9891\u7684\u65f6\u5019\uff0c\u7b2c\u4e8c\u5e27\u89c6\u9891\u672c\u6765\u5e94\u8be5\u6301\u7eed\u663e\u793a 0.04s \u7684\uff0c\u56e0\u4e3a\u6309\u5e27\u7387\u7b97\u561b\uff0c\u4e00\u5e27\u89c6\u9891\u663e\u793a 0.04s\u79d2\u518d\u663e\u793a\u4e0b\u4e00\u5e27\u3002\u4f46\u662f\u56e0\u4e3a\u89c6\u9891\u6bd4\u97f3\u9891\u6162\u4e860.03s\uff0c\u7b2c\u4e8c\u5e27\u89c6\u9891\u4e0d\u80fd\u663e\u793a 0.04s\u8fd9\u4e48\u957f\u65f6\u95f4\uff0c\u4ed6\u53ea\u80fd\u663e\u793a 0.01s\u79d2\uff0c\u56e0\u4e3a\u5230 14:00:00:10 \u7684\u65f6\u5019\u5df2\u7ecf\u5f00\u59cb\u64ad\u653e\u7b2c\u4e94\u5e27\u97f3\u9891\u4e86\uff0c\u6240\u4ee5\u9700\u8981\u7acb\u5373\u663e\u793a\u7b2c\u4e09\u5e27\u89c6\u9891\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u5c31\u662f compute_target_delay() \u51fd\u6570\u505a\u7684\u4e8b\u60c5\uff0c\u4f20\u8fdb\u53bb\u7684\u53c2\u6570 delay \u662f 0.04s\uff0cdelay\u662f\u4e0a\u4e00\u5e27\u5e94\u8be5\u6301\u7eed\u663e\u793a\u7684\u65f6\u957f\uff0c\u7136\u540e\u8ba1\u7b97\u51fa\u89c6\u9891\u6162\u4e8e\u97f3\u9891\u591a\u5c11\uff0c\u5c31\u662f diff \u7b49\u4e8e\u8d1f\u591a\u5c11\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u89c6\u9891\u6bd4\u97f3\u9891\u6162\uff0cdiff \u5c31\u4f1a\u662f\u8d1f\u6570\uff0cdelay +diff \u5c31\u4f1a\u5bfc\u81f4delay\u51cf\u5c11\uff0c\u4f8b\u5982\u4e0a\u9762\u7684\u4f8b\u5b50\u4ece 0.04s \u51cf\u5c11\u5230 0.01s\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u89c6\u9891\u6bd4\u97f3\u9891\u5feb\uff0cdiff \u5c31\u4f1a\u662f\u6b63\u6570\uff0cdelay +diff \u5c31\u4f1a\u5bfc\u81f4delay\u62c9\u957f\uff0c\u62c9\u957f\u4f1a\u5bfc\u81f4\u91cd\u590d\u64ad\u653e\u4e0a\u4e00\u5e27\u89c6\u9891\u3002<\/p>\n\n\n\n<p>\u6211\u4e0a\u9762\u5728 main() \u52a0\u7684 start_time\uff0c\u5728 diff = get_clock(&amp;is-&gt;vidclk) - get_master_clock(is); \u7684\u65f6\u5019\u5176\u5b9e\u662f\u53ef\u4ee5\u5bf9\u6d88\u6389\u7684\uff0c\u5b9e\u9645\u4e0a\u7b49\u4e8e\u4ec0\u4e48\u90fd\u6ca1\u6539\uff0c\u53ea\u662f\u65b9\u4fbf\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u5df2\u7ecf\u77e5\u9053\u600e\u4e48\u8ba1\u7b97\u51fadiff\uff0c\u7136\u540e\u4e5f\u77e5\u9053diff\u7684\u4f5c\u7528\uff0c\u4f46\u662f compute_target_delay \u7528 diff\u7684\u65b9\u5f0f\u6709\u70b9\u590d\u6742\uff0c\u8fd8\u662f\u9700\u8981\u7ee7\u7eed\u8bb2\u89e3\u4e00\u4e0b\uff0c\u8bf7\u770b\u4e0b\u9762\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >sync_threshold = FFMAX(AV_SYNC_THRESHOLD_MIN, FFMIN(AV_SYNC_THRESHOLD_MAX, delay));\nif (!isnan(diff) &amp;&amp; fabs(diff) &lt; is-&gt;max_frame_duration) {\n     if (diff &lt;= -sync_threshold)\n          delay = FFMAX(0, delay + diff);\n     else if (diff &gt;= sync_threshold &amp;&amp; delay &gt; AV_SYNC_FRAMEDUP_THRESHOLD)\n          delay = delay + diff;\n     else if (diff &gt;= sync_threshold)\n          delay = 2 * delay;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e9b\u903b\u8f91\u5224\u65ad\u7684\u610f\u601d\u662f\u3002<\/p>\n\n\n\n<p>1\uff0c\u5982\u679c\u97f3\u89c6\u9891\u5dee\u8ddd\u5927\u4e8e max_frame_duration \u4e0d\u8fdb\u884c\u540c\u6b65\uff0c\u4e0d\u7ba1\u3002<\/p>\n\n\n\n<p>2\uff0c<strong>sync_threshold = FFMAX(AV_SYNC_THRESHOLD_MIN, FFMIN(AV_SYNC_THRESHOLD_MAX, delay));<\/strong><\/p>\n\n\n\n<p>\u8fd9\u6bb5\u4ee3\u7801\u7684\u610f\u601d\u662f\uff0c\u8ba9 sync_threshold \u5728 0.04 ~ 0.1 \u4e4b\u95f4\u53d6\u503c\uff0c\u5177\u4f53\u770bdelay\u7684\u503c\u3002<\/p>\n\n\n\n<p>3\uff0c\u5728\u672c\u6587\u7684\u547d\u4ee4\u91cc\uff0csync_threshold \u7684\u503c\u662f 0.04166\uff0c\u4e5f\u5c31\u662f\u4e00\u5e27\u89c6\u9891\u7684\u65f6\u95f4\u3002\u5982\u679c\u89c6\u9891\u6162\u4e8e\u97f3\u9891 0.03s \uff0cdiff = -0.03\uff0c\u90a3 diff &lt;= -sync_threshold \u5c31\u662f\u5047\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u89c6\u9891\u6162\u4e8e\u97f3\u9891 0.03s \uff0c\u90a3\u4e0a\u9762\u7684\u4efb\u4f55 if \u6761\u4ef6\u90fd\u4e0d\u4f1a\u8dd1\u8fdb\u53bb\uff0c\u5c31\u662f\u4e0d\u8fdb\u884c\u540c\u6b65\u3002\u8fd9\u91cc\u540c\u6b65\u903b\u8f91\u5c31\u662f\uff0c\u5982\u679c\u89c6\u9891\u6162\u4e8e\u97f3\u9891\u7684\u65f6\u95f4\uff0c\u6bd4\u4e00\u5e27\u7684\u65f6\u95f4\u8fd8\u77ed\uff0c\u4e0d\u8fdb\u884c\u540c\u6b65\u3002\u6240\u4ee5\u6211\u4e0a\u9762\u7684\u90a3\u4e2a14:00:00 \uff08\u4e0b\u53482\u70b9\uff09 0.03s\uff0c\u51cf\u5c11\u5230 0.01s\u7684\u90a3\u4e2a\u4f8b\u5b50\u7684\u65f6\u95f4\u5047\u8bbe\u6709\u70b9\u95ee\u9898\uff0c\u4e0d\u8981\u4ecb\u610f\uff0c\u539f\u7406\u5c31\u662f\u90a3\u6837\u3002<\/p>\n\n\n\n<p>4\uff0c\u5982\u679c\u89c6\u9891\u6162\u4e8e\u97f3\u9891 0.05s\uff0c\u90a3 diff &lt;= -sync_threshold \u5c31\u662f\u771f\uff0c\u5c31\u4f1a\u8dd1\u8fdb\u53bb delay = FFMAX(0, delay + diff)\uff0c\u8fd9\u6837delay \u5c31\u7b49\u4e8e 0\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u89c6\u9891\u6162\u4e8e\u97f3\u9891\u7684\u65f6\u95f4\uff0c\u6bd4\u4e00\u5e27\u7684\u65f6\u95f4\u957f\uff0c\u5c31\u8bbe\u7f6edelay\u4e3a0\uff0c\u6b63\u5728\u663e\u793a\u7684\u5e27\u9a6c\u4e0a\u6d88\u5931\uff0c\u7acb\u5373\u663e\u793a\u4e0b\u4e00\u5e27\u89c6\u9891\u3002<\/p>\n\n\n\n<p>5\uff0c\u5982\u679c\u89c6\u9891\u5feb\u4e8e\u97f3\u9891 0.03s\uff0c\u4e0a\u9762\u7684\u4efb\u4f55 if \u6761\u4ef6\u90fd\u4e0d\u4f1a\u8dd1\u8fdb\u53bb\u3002\u4e0d\u8fdb\u884c\u540c\u6b65\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u89c6\u9891\u5feb\u4e8e\u97f3\u9891\u7684\u65f6\u95f4\uff0c\u6bd4\u4e00\u5e27\u89c6\u9891\u7684\u65f6\u95f4\u8fd8\u77ed\uff0c\u4e0d\u8fdb\u884c\u540c\u6b65\u3002<\/p>\n\n\n\n<p>6\uff0c\u5982\u679c\u89c6\u9891\u5feb\u4e8e\u97f3\u9891 0.05s\uff0c\u5c31\u4f1a\u8dd1\u8fdb\u53bb delay = delay + diff;\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u89c6\u9891\u5feb\u4e8e\u97f3\u9891\u7684\u65f6\u95f4\uff0c\u6bd4\u4e00\u5e27\u89c6\u9891\u7684\u65f6\u95f4\u957f\uff0c\u957f\u591a\u5c11\u65f6\u95f4\u5c31\u5ef6\u957f\u591a\u5c11\u4e0a\u4e00\u5e27\u7684\u663e\u793a\u65f6\u95f4\u3002\u8fd9\u4e2a\u5224\u65ad\u8fd8\u6709\u4e2a AV_SYNC_FRAMEDUP_THRESHOLD \u9650\u5236\uff0cAV_SYNC_FRAMEDUP_THRESHOLD \u7b49\u4e8e 0.1\uff0c1\u79d210\u5e27\uff0c\u4e5f\u5c31\u662f\u4f4e\u5e27\u7387\u8fd9\u4e2a\u6761\u4ef6\u4e0d\u751f\u6548\u3002<\/p>\n\n\n\n<p>6\uff0c\u5982\u679c\u89c6\u9891\u5feb\u4e8e\u97f3\u9891 0.05s\uff0c\u540c\u65f6\uff0c\u89c6\u9891\u6d41\u53c8\u662f1\u79d25\u5e27\u90a3\u79cd\u4f4e\u5e27\u7387\u89c6\u9891\uff0c\u5c31\u4f1a\u8dd1\u8fdb\u53bb delay = 2 * delay\uff0c\u76f4\u63a5double\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u5df2\u7ecf\u4e3e\u4f8b\u628a\u89c6\u9891\u540c\u6b65\u7684\u6240\u6709\u60c5\u51b5\u90fd\u5217\u4e3e\u5b8c\u4e86\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>\u89c6\u9891\u540c\u6b65\uff0c\u8ba1\u7b97\u51fa delay \u7684\u503c\u4e4b\u540e\uff0c\u8fd8\u6709\u4e24\u4e2a\u903b\u8f91\uff0c\u51b3\u5b9a\u662f\u91cd\u590d\u663e\u793a\u4e0a\u4e00\u5e27\uff0c\u8fd8\u662f\u64ad\u653e\u521a\u521a\u53d6\u51fa\u6765\u7684\u5f53\u524d\u5e27\uff0c\u8fd8\u662f\u4e22\u5f03\u521a\u521a\u53d6\u51fa\u6765\u7684\u5f53\u524d\u5e27\u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"974\" height=\"611\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-9-3.png\" alt=\"\" class=\"wp-image-480\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffplay.c 1622\u884c\nif (time &lt; is-&gt;frame_timer + delay) {\n    *remaining_time = FFMIN(is-&gt;frame_timer + delay - time, *remaining_time);\n    goto display;\n}<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u4e0a\u4e00\u5e27\u8fd8\u6ca1\u663e\u793a\u5b8c\uff0c\u4e0d\u9700\u8981\u53d6\u4e0b\u4e00\u5e27\u6765\u64ad\u653e\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u7ee7\u7eed\u8dd1\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >if (frame_queue_nb_remaining(&amp;is-&gt;pictq) &gt; 1) {\n    Frame *nextvp = frame_queue_peek_next(&amp;is-&gt;pictq);\n    duration = vp_duration(is, vp, nextvp);\n    if(!is-&gt;step &amp;&amp; (framedrop&gt;0 || (framedrop &amp;&amp; get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) &amp;&amp; time &gt; is-&gt;frame_timer + duration){\n        is-&gt;frame_drops_late++;\n        frame_queue_next(&amp;is-&gt;pictq);\n        goto retry;\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u7684\u903b\u8f91\u9700\u8981\u6ce8\u610f\uff0c\u56e0\u4e3a\u4e4b\u524d\u8ba1\u7b97\u51fa\u6765\u7684 delay \u662f\u4e00\u4e2a \u5927\u4e8e\u7b49\u4e8e 0 \u7684\u6570\uff0c\u4f46\u662f\u6709\u53ef\u80fd\u89c6\u9891\u5df2\u7ecf\u843d\u540e\u4e8e\u97f3\u98912\u4e2a\u89c6\u9891\u5e27\u7684\u65f6\u95f4\u4e86\uff0c<\/p>\n\n\n\n<p>\u4f8b\u5982 \u97f3\u9891\u64ad\u653e\u7ebf\u7a0b \u5df2\u7ecf\u64ad\u653e\u5230 \u7b2c\u4e03\u5e27 0.12(14:00:00:14) \u4e86\uff0c\u4f46\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\u56e0\u4e3a\u4e00\u4e9b\u539f\u56e0\u5361\u4f4f\u4e86\uff0c\u624d\u64ad\u653e\u5230 \u7b2c\u4e8c\u5e27 0.04 (14:00:00:14)\uff0c\u89c6\u9891\u6bd4\u97f3\u9891\u6162\u4e860.08s\uff0c2\u4e2a\u5e27\u7684\u65f6\u95f4\uff0c\u4f46\u662fdelay\u53ea\u80fd\u8fd4\u56de 0\uff0cdelay\u4e0d\u80fd\u662f\u8d1f\u6570\u3002\u6240\u4ee5\u9700\u8981\u4e0a\u9762\u90a3\u6bb5\u4ee3\u7801\u5224\u65ad\u3002<\/p>\n\n\n\n<p>\u5224\u65ad\u5982\u679c\u961f\u5217\u91cc\u9762\u6709\u8d85\u8fc7 2 \u4e2a\u5e27\uff0c\u800c\u4e14\u89c6\u9891\u6bd4\u97f3\u9891\u6162 2 \u4e2a\u5e27\u65f6\u95f4\u4ee5\u4e0a\uff0c\u4e3a\u4ec0\u4e48\u662f2\u4e2a\u5e27\uff0c\u662f\u56e0\u4e3a frame_timer \u5df2\u7ecf\u91cd\u65b0\u8d4b\u503c\u4e86\uff0c\u90a3\u521a\u521a\u53d6\u51fa\u6765\u7684\u5f53\u524d\u5e27\u4e0d\u7528\u53bb\u64ad\u653e\uff0c\u76f4\u63a5\u4e22\u5f03\uff0c\u7ee7\u7eed\u53d6\u961f\u5217\u7684\u4e0b\u4e00\u5e27\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u903b\u8f91\u662f\u4e3a\u4e86\u5904\u7406\u89c6\u9891\u6162\u4e8e\u97f3\u9891\u592a\u591a\u65f6\u95f4\uff0c\u7528\u6765\u4e22\u89c6\u9891\u5e27\u7684\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 video_reflesh() \u91cc\u9762\u7684\u89c6\u9891\u540c\u6b65\u903b\u8f91\u91cd\u70b9\u603b\u7ed3\u5982\u4e0b\u3002<\/p>\n\n\n\n<p>1\uff0c\u89c6\u9891\u5982\u679c\u6162\u4e8e\u97f3\u9891\u4e00\u4e2a\u89c6\u9891\u5e27\u4ee5\u5185\u7684\u65f6\u95f4\uff0c\u4e0d\u8fdb\u884c\u540c\u6b65\u3002\u4e3a\u4ec0\u4e48\u5dee\u8ddd\u4e00\u4e2a\u89c6\u9891\u5e27\u4e4b\u5185\u4e0d\u540c\u6b65\uff1f\u4e5f\u662f\u975e\u5e38\u5bb9\u6613\u63a8\u7406\u5230\u7684\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982 14:00:00:10 \u7684\u65f6\u5019\u64ad\u653e\u7b2c\u4e94\u5e27\u97f3\u9891\uff0c\u4f46\u662f\u5230 14:00:00:12 \u7684\u65f6\u5019\u624d\u64ad\u653e\u7b2c\u4e09\u5e27\u89c6\u9891\uff0c\u7b2c\u4e09\u5e27\u89c6\u9891\u8ddf\u7b2c\u4e94\u5e27\u97f3\u9891\u5e94\u8be5\u540c\u65f6\u95f4\u64ad\u653e\uff0c\u4f46\u662f\u89c6\u9891\u6162\u4e86 0.02s\u79d2\uff0c\u90a3 0.02\u79d2\u7684\u65f6\u95f4\u5dee\u8ddd\u9700\u8981\u540c\u6b65\u5417\uff1f\u89c6\u9891\u4e00\u5e27\u7684\u65f6\u95f4\u90fd\u9700\u8981\u663e\u793a0.04s\u79d2\uff0c\u8fd9\u4e2a0.02s\u8fde\u4e00\u5e27\u90fd\u4e0d\u591f\uff0c\u592a\u5c0f\u4e86\uff0c\u5bdf\u89c9\u4e0d\u51fa\u6765\u3002\u6240\u4ee5\u4e0d\u540c\u6b65\u662f\u60c5\u6709\u53ef\u539f\u7684\u3002<\/p>\n\n\n\n<p>2\uff0c\u89c6\u9891\u5982\u679c\u6162\u4e8e\u97f3\u98911\u4e2a\u89c6\u9891\u5e27\u7684\u65f6\u95f4\uff0c\u4f46\u662f\u4e0d\u6162\u4e8e2\u4e2a\u89c6\u9891\u5e27\u7684\u65f6\u95f4\uff0cdelay \u7f6e\u4e3a 0\uff0c\u7a97\u53e3\u73b0\u5728\u64ad\u653e\u7684\u5e27\u7acb\u5373\u6d88\u5931\u3002\u4e0b\u4e00\u5e27\u663e\u793a\u3002<\/p>\n\n\n\n<p>3\uff0c\u89c6\u9891\u5982\u679c\u6162\u4e8e\u97f3\u98912\u4e2a\u89c6\u9891\u5e27\u7684\u65f6\u95f4\uff0cdelay \u7f6e\u4e3a 0\uff0c\u7a97\u53e3\u73b0\u5728\u64ad\u653e\u7684\u5e27\u7acb\u5373\u6d88\u5931\u3002\u4e0b\u4e00\u5e27\u4e22\u5f03\uff0c\u53d6\u4e0b\u4e0b\u4e00\u5e27\u663e\u793a\u3002\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>4\uff0c\u89c6\u9891\u5982\u679c\u5feb\u4e8e\u97f3\u9891\uff0c\u62c9\u957f\u4e0a\u4e00\u5e27\u7684\u663e\u793a\u65f6\u95f4\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u8fd8\u6709\u4e00\u4e2a\u51fd\u6570\u6ca1\u6709\u8bb2\u89e3\uff0c\u5c31\u662f video_display() \u91cc\u9762\u7684video_image_display()\u3002<\/p>\n\n\n\n<p>video_image_display() \u7684\u5185\u90e8\u903b\u8f91\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>frame_queue_peek_last()\uff0c \u62ff\u5230\u4e0a\u4e00\u5e27\u89c6\u9891\u3002<\/li><li>calculate_display_rect()\uff0c\u8ba1\u7b97 SDL_Rect\uff0c\u91cc\u9762\u4f7f\u7528\u4e86 sar \u8fd9\u4e2a\u53c2\u6570\uff0csar \u7684\u542b\u4e49\u7b80\u5355\u6765\u8bf4\u5c31\u662f \u628a\u5bbd\u9ad8\u6309 sar \u7684\u6bd4\u4f8b\u62c9\u4f38\u64ad\u653e\uff0c\u8fd9\u4e2a\u662f\u663e\u793a\u8bbe\u5907\u50cf\u7d20\u8bbe\u8ba1\u4e0d\u540c\u5bfc\u81f4\u7684\uff0c\u63a8\u8350\u9605\u8bfb\uff1a<a href=\"https:\/\/link.juejin.cn\/?target=https%3A%2F%2Fblog.csdn.net%2Fzhizhuodewo6%2Farticle%2Fdetails%2F105247557\">ffmpeg\u89e3\u6790\u51fa\u7684\u89c6\u9891\u53c2\u6570PAR\uff0cDAR\uff0cSAR\u7684\u610f\u4e49<\/a> \u8ddf <a href=\"https:\/\/link.juejin.cn\/?target=https%3A%2F%2Fwww.animemusicvideos.org%2Fguides%2Favtech3%2Ftheory-videoaspectratios.html\">theory-videoaspectratios<\/a><\/li><li>upload_texture()\uff0c\u628a \u89c6\u9891\u5e27\u6570\u636e\u66f4\u65b0\u5230 is-&gt;vid_texture\uff0c\u66f4\u65b0\u5230 SDL texture\u91cc\u9762\u3002<\/li><li>SDL_RenderCopyEx() \uff0c\u628a SDL texture \u7eb9\u7406 \u62f7\u8d1d\u5230 SDL render \u6e32\u67d3\u5668\u91cc\u9762<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>ffplay \u6e90\u7801\u5206\u6790\uff0cevent_loop() \u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\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\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 FFplay \u6e90\u7801\u5206\u6790\u7cfb [&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-479","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-\u97f3\u89c6\u9891\u540c\u6b652 - \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\" 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