{"id":484,"date":"2022-01-31T19:14:39","date_gmt":"2022-01-31T11:14:39","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=484"},"modified":"2022-06-11T03:04:38","modified_gmt":"2022-06-10T19:04:38","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%a53","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=484","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-\u97f3\u89c6\u9891\u540c\u6b653"},"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\u5b8c\u4e86\u89c6\u9891\u64ad\u653e\u7ebf\u7a0b\u7684\u5185\u90e8\u903b\u8f91\uff0c\u89c6\u9891\u540c\u6b65\u7b97\u6cd5\u4e5f\u8fdb\u884c\u4e86\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u5f00\u59cb\u8bb2\u97f3\u9891\u540c\u6b65\u7b97\u6cd5\uff0c\u4e5f\u5c31\u662f\u7528<strong>-sync video<\/strong> \u628a\u540c\u6b65\u65b9\u5f0f \u8bbe\u7f6e\u4e3a AV_SYNC_VIDEO_MASTER\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u89c6\u9891\u662f\u4e3b\u65f6\u949f\uff0c\u6240\u4ee5video_reflesh() \u64ad\u653e\u89c6\u9891\u7684\u65f6\u5019\uff0ccompute_target_delay() \u4ec0\u4e48\u90fd\u6ca1\u6709\u505a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >last_duration = vp_duration(is, lastvp, vp);\ndelay = compute_target_delay(last_duration, is);<\/code><\/pre>\n\n\n\n<p>delay \u7b49\u4e8e last_duration\uff0c\u89c6\u9891\u6d41\u4f1a\u6309\u7167\u81ea\u8eab\u7684\u5e27\u7387\u64ad\u653e\u3002\u7136\u540e \u97f3\u9891 \u4f1a\u5411\u89c6\u9891\u8fdb\u884c\u540c\u6b65\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8bb2\u89e3\u97f3\u9891 \u662f\u5982\u4f55\u5411\u89c6\u9891\u540c\u6b65\u7684\u3002<\/p>\n\n\n\n<p>\u7b2c8\u7bc7\u6587\u7ae0\u7684\u65f6\u5019\u8bf4\u8fc7\uff0c\u97f3\u9891\u64ad\u653e\u662f\u5728 sdl_audio_callback() \u56de\u8c03\u7ebf\u7a0b\u91cc\u9762\u5904\u7406\u7684\uff0c\u5f53\u65f6\u6211\u6ca1\u6709\u63d0\u53ca\u5230 synchronize_audio() \u8fd9\u4e2a\u51fd\u6570\uff0c\u662f\u56e0\u4e3a\u8fc7\u65e9\u63d0\u53ca\u4f1a\u7ed9\u8bb2\u89e3\u5e26\u6765\u4e0d\u5fc5\u8981\u7684\u590d\u6742\u6027\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>\u73b0\u5728\u53ef\u4ee5\u4ed4\u7ec6\u5206\u6790 synchronize_audio() \u8fd9\u4e2a\u51fd\u6570\u4e86\uff0c\u56e0\u4e3a \u97f3\u9891\u540c\u6b65\u7b97\u6cd5 \u5c31\u662f \u5728 synchronize_audio() \u91cc\u9762\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<p>synchronize_audio() \u7684\u8c03\u7528\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"606\" height=\"48\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-10-1.png\" alt=\"\" class=\"wp-image-487\"\/><\/figure>\n\n\n\n<p>synchronize_audio() \u7684\u4ee3\u7801\u5982\u4e0b\uff0c\u91cd\u70b9\u6211\u5df2\u7ecf\u7ea2\u7b14\u5708\u51fa\u6765\u4e86\u3002\u5176\u5b9e\u5168\u90e8\u90fd\u662f\u91cd\u70b9\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"861\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-10-2.png\" alt=\"\" class=\"wp-image-485\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u8ddf\u89c6\u9891\u540c\u6b65\u4e00\u6837\u7684\u5957\u8def\uff0c\u5148\u8ba1\u7b97\u51fa \u97f3\u9891\u65f6\u949f\u6bd4\u89c6\u9891\u65f6\u949f\u6162\u591a\u5c11\uff0c\u6216\u8005\u5feb\u591a\u5c11\uff0c\u4e5f\u5c31\u662f diff\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >diff = get_clock(&amp;is-&gt;audclk) - get_master_clock(is);<\/code><\/pre>\n\n\n\n<p>\u7136\u540e \u5bf9 diff \u505a\u4e86\u5224\u65ad\uff0c\u5c0f\u4e8e 10s \u79d2\u5185\u7684\u5dee\u5f02\u90fd\u53ef\u4ee5\u8fdb\u884c\u540c\u6b65\u64cd\u4f5c\uff0c\u5927\u4e8e10s\u5c31\u4f1areset A-V filter\u4e86\uff0cAV_NOSYNC_THRESHOLD = 10s\u3002<\/p>\n\n\n\n<p>\u540e\u9762\u7684\u903b\u8f91\u5c31\u6bd4\u8f83\u590d\u6742\u4e86\uff0c\u9700\u8981\u5148\u5206\u6790\u4e00\u4e9b\u53d8\u91cf\u7684\u4f5c\u7528\uff0c<\/p>\n\n\n\n<p>audio_diff_avg_count \u7528\u6765\u7edf\u8ba1\u97f3\u89c6\u9891\u4e0d\u540c\u6b65\u7684\u6b21\u6570\uff0c\u56e0\u4e3acallback\u6bcf0.04s\u624d\u56de\u8c03\u4e00\u6b21\uff0cAUDIO_DIFF_AVG_NB \u8bbe\u7f6e\u4e3a20\uff0c\u4e5f\u5c31\u662f\u81f3\u5c11\u8981\u6709\u5dee\u5f0220\u6b21\u624d\u5f00\u59cb\u6267\u884c\u6837\u672c\u8865\u507f\u7b97\u6cd5\u3002<\/p>\n\n\n\n<p>audio_diff_avg_coef \u7684\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/* init averaging filter *\/\nis-&gt;audio_diff_avg_coef  = exp(log(0.01) \/ AUDIO_DIFF_AVG_NB);<\/code><\/pre>\n\n\n\n<p>\u5b83\u9996\u5148\u7528 log \u6c42 0.01 \u7684\u81ea\u7136\u5bf9\u6570\uff0c\u9664\u4ee5 20\uff0c\u6700\u540e\u53c8\u6c42\u6307\u6570\uff0c\u81ea\u7136\u5bf9\u6570\u7f29\u5199\u7136\u540e\u6c42\u6307\u6570\uff0c\u6211\u4e5f\u4e0d\u592a\u61c2\uff0c\u9700\u8981\u7528\u5230\u8fd9\u4e2a\u7b97\u6cd5\u7167\u6284\u5c31\u884c\uff0c\u54b1\u4eec\u5199\u4ee3\u7801\u7684\uff0c\u6570\u5b66\u516c\u5f0f\u770b\u4e0d\u61c2\uff0c\u53d8\u91cf\u8ddf if \u7b49\u903b\u8f91\u80af\u5b9a\u80fd\u770b\u61c2\uff0c\u6284\u8fd8\u662f\u53ef\u4ee5\u6284\u7684\u3002<\/p>\n\n\n\n<p>audio_diff_avg_coef \u7ffb\u8bd1\u4e00\u4e0b\uff0c\u662f\u6307 \u97f3\u9891 \u5dee\u5f02 \u5e73\u5747 \u7cfb\u6570\uff0cavg \u662f\u5e73\u5747\uff0ccoef \u662f\u7cfb\u6570\uff0c\u8fd9\u662f\u4e00\u4e2a\u7cfb\u6570\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>audio_diff_avg_coef \u7b97\u51fa\u6765\u7684\u503c\u662f 0.79432\u3002<\/p>\n\n\n\n<p>\u5e73\u5747\u7cfb\u6570\u53d8\u91cf\u5982\u4f55\u4f7f\u7528\uff1f\u4ed4\u7ec6\u770b\u4e0b\u9762\u8fd9\u884c\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >is-&gt;audio_diff_cum = diff + is-&gt;audio_diff_avg_coef * is-&gt;audio_diff_cum;<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u884c\u4ee3\u7801\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u8ba9\u524d\u9762\u7684\u5dee\u5f02\u6743\u91cd\u8d8a\u6765\u8d8a\u5c0f\uff0c\u540e\u9762\u7684\u5dee\u5f02\u6743\u91cd\u8d8a\u6765\u8d8a\u5927\u3002\u6211\u628a diff \u5206\u4e3a 3\u6b21\u5dee\u5f02\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>a_diff \u4e3a\u7b2c\u4e00\u6b21\u5dee\u5f02\uff0cb_diff \u4e3a\u7b2c\u4e8c\u6b21\u5dee\u5f02\uff0cc_diff \u4e3a\u7b2c\u4e09\u6b21\u5dee\u5f02\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >is-&gt;audio_diff_cum = (a_diff) + (b_diff + 0.79 * a_diff) + ( c_diff + 0.79 * (b_diff + 0.79 * a_diff) )\u3002<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u6700\u5f00\u59cb\u7684\u5dee\u5f02 a_diff \u4e58\u4e86\u4e24\u6b21 0.79 \uff0c\u6240\u4ee5a_diff \u4f1a\u53d8\u5f97\u8d8a\u6765\u8d8a\u5c0f\uff0cb_diff \u4e58\u4e86\u4e00\u6b21 0.79\uff0cc_diff \u8fd8\u662f\u539f\u6765\u7684 c_diff \uff0cc \u7684\u6743\u91cd\u6700\u5927\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8bf4\uff0caudio_diff_avg_coef \u7cfb\u6570\u662f\u7528\u6765\u8fdb\u884c\u64cd\u4f5c\u6743\u91cd\u7684\u3002\u60f3\u4e00\u4e0b\u4e5f\u5408\u7406\uff0c\u540e\u9762\u7684\u5dee\u5f02\u80af\u5b9a\u6743\u91cd\u5927\u3002<\/p>\n\n\n\n<p>\u6700\u540e \u4f1a\u7b97\u51fa\u4e00\u4e2a \u5e73\u5747 \u5dee\u5f02 avg_diff\u3002\u4e5f\u5c31\u662f\u5982\u4e0b\u4ee3\u7801\uff0cis-&gt;audio_diff_cum \u4e58\u4ee5 0.21\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/* estimate the A-V difference *\/\navg_diff = is-&gt;audio_diff_cum * (1.0 - is-&gt;audio_diff_avg_coef);<\/code><\/pre>\n\n\n\n<p>\u8fd8\u6709\u4e00\u4e2a\u5b57\u6bb5 audio_diff_threshold \uff0caudio_diff_threshold \u7684\u8d4b\u503c\u662f\u5728 audio_open \u6253\u5f00\u97f3\u9891\u8bbe\u5907\u7684\u65f6\u5019\u8d4b\u503c\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/* since we do not have a precise anough audio FIFO fullness, we correct audio sync only if larger than this threshold *\/\nis-&gt;audio_diff_threshold = (double)(is-&gt;audio_hw_buf_size) \/ is-&gt;audio_tgt.bytes_per_sec;<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c audio_diff_threshold \u5b9e\u9645\u4e0a\u7b49\u4e8e0.04s\uff0c\u7b49\u4e8e\u4e00\u4e2a\u97f3\u9891callback\u7684\u56de\u8c03\u95f4\u9694\u3002<\/p>\n\n\n\n<p>\u7136\u540e\u5224\u65ad avg_diff \u5927\u4e8e\u4e00\u4e2acallback\u7684\u65f6\u95f4\u5c31\u8fdb\u884c\u540c\u6b65\uff0c\u5c11\u4e8e\u4e0d\u7ba1\u3002\u8ddf\u89c6\u9891\u540c\u6b65\u4e5f\u5f88\u50cf\uff0c\u89c6\u9891\u662f\u5927\u4e8e\u4e00\u4e2a\u89c6\u9891\u5e27\u7684\u65f6\u95f4\u624d\u540c\u6b65\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u7ee7\u7eed\u8dd1\uff0c\u8dd1\u5230\u4e0b\u9762\u8fd9\u53e5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >wanted_nb_samples = nb_samples + (int)(diff * is-&gt;audio_src.freq);<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u53e5\u4ee3\u7801\u628a diff \u97f3\u9891\u843d\u540e\/\u5feb\u4e8e\u89c6\u9891\u7684\u65f6\u5019\uff0c\u6362\u7b97\u6210\u6837\u672c\u6570\uff0c\u589e\u52a0\u6216\u8005\u51cf\u5c11\u539f\u6765\u7684\u6837\u672c\u6570\uff0c\u8fbe\u5230\u62c9\u957f\u58f0\u97f3\uff0c\u6216\u8005\u7f29\u77ed\u58f0\u97f3\u65f6\u95f4\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<p>\u97f3\u9891\u5982\u679c\u5feb\u4e8e\u89c6\u9891\uff0c\u5c31\u628a\u58f0\u97f3\u62c9\u957f\uff0c\u64ad\u653e\u5f97\u6162\u4e00\u70b9\u3002<\/p>\n\n\n\n<p>\u97f3\u9891\u5982\u679c\u6162\u4e8e\u89c6\u9891\uff0c\u5c31\u628a\u58f0\u97f3\u7f29\u77ed\uff0c\u64ad\u653e\u5f97\u5feb\u4e00\u70b9\uff0c<\/p>\n\n\n\n<p>\u5feb\u6162\u4e0d\u80fd\u8d85\u8fc7\u539f\u672c\u6837\u672c\u7684 10%\u3002\u56e0\u4e3a\u58f0\u97f3\u5982\u679c\u62c9\u5f97\u592a\u957f\uff0c\u6216\u8005\u7f29\u5f97\u592a\u591a\u4f1a\u5f88\u5bb9\u6613\u542c\u51fa\u6765\u3002\u5982\u679c \u7f29\u77ed 10% \u4e0d\u8db3\u4ee5\u8ba9\u97f3\u9891\u8ffd\u4e0a\u89c6\u9891\uff0c\u4e0b\u6b21\u8fd8\u4f1a\u518d\u7f29\u77ed10%\uff0c\u62c9\u957f\u540c\u7406\u3002<\/p>\n\n\n\n<p>\u97f3\u9891\u540c\u6b65\u65b9\u5f0f\u8ddf\u89c6\u9891\u4e0d\u4e00\u6837\uff0c\u4e0d\u662f\u7528\u4e22\u5e27\u6216\u8005\u91cd\u590d\u4e0a\u4e00\u5e27\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3a\u97f3\u9891\u7684\u8fde\u7eed\u6027\u592a\u5f3a\uff0c\u97f3\u98911\u79d2\u64ad\u653e48000\u6837\u672c\uff0c\u89c6\u9891\u4e00\u79d2\u624d\u64ad\u653e24\u5e27\u3002<\/p>\n\n\n\n<p>\u6700\u540e\u5f97\u5230\u7684 wanted_nb_samples \u4f1a\u4f20\u8fdb\u53bb swr_set_compensation() \uff0c\u56e0\u4e3a\u62c9\u957f\u6216\u7f29\u77ed\u97f3\u9891\u662f\u91cd\u91c7\u6837\u51fd\u6570\u505a\u7684\u3002<\/p>\n\n\n\n<p>\u6700\u540e\u8fd8\u6709\u4e00\u4e2a\u77e5\u8bc6\u70b9\u60f3\u8bb2\u89e3\u4e00\u4e0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"50\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-10-3.png\" alt=\"\" class=\"wp-image-486\"\/><\/figure>\n\n\n\n<p>\u97f3\u9891\u540c\u6b65\u4ee3\u7801\u80fd\u62c9\u957f\u6216\u7f29\u77ed\u7684\u6570\u636e\u662f len \u7eff\u8272\u7684\u90e8\u5206\uff0c\u4f46\u6211\u4e2a\u4eba\u611f\u89c9\u5e94\u8be5\u7acb\u5373\u628a\u7ea2\u8272\u90e8\u5206\u7684\u97f3\u9891\u62c9\u957f\u6216\u7f29\u77ed\u624d\u80fd\u66f4\u5b9e\u65f6\uff0c\u4e0d\u8fc7\u53ef\u80fd\u662f\u56e0\u4e3a\u97f3\u9891\u7684\u8fde\u7eed\u6027\u5f88\u5f3a\uff0c\u62c9\u957f\u7eff\u8272\u90e8\u5206\u7684\u97f3\u9891\u6570\u636e\u6548\u679c\u4e5f\u5dee\u4e0d\u591a\u3002<\/p>\n\n\n\n<p>\u6211\u628a\u8fd9\u79cd\u64cd\u4f5c\u79f0\u4e3a\uff0c\u6837\u672c\u8865\u507f\u53f3\u79fb\uff0c\u672c\u6765\u5e94\u8be5\u64cd\u4f5c\u5de6\u8fb9\u7ea2\u8272\u7684\u5185\u5b58\uff0c\u4f46\u662fSDL\u6ca1\u6709\u63a5\u53e3\u53ef\u4ee5\u64cd\u4f5c\uff0c\u53ea\u80fd\u64cd\u4f5c\u53f3\u8fb9\u7eff\u8272\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<hr 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