{"id":1636,"date":"2022-03-20T20:01:59","date_gmt":"2022-03-20T12:01:59","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1636"},"modified":"2022-06-11T02:10:51","modified_gmt":"2022-06-10T18:10:51","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-rtmp%e7%9a%84pts","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1636","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-RTMP\u7684PTS"},"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 -loglevel quiet -fflags nobuffer -i rtmp:\/\/192.168.0.122\/live\/livestream<\/code><\/pre>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<p>\u64ad\u653e\u97f3\u89c6\u9891\u6d41\u6700\u91cd\u8981\u7684\u662f\u540c\u6b65\uff0c\u540c\u6b65\u9700\u8981\u7528\u5230\u5404\u4e2a\u5e27\u7684pts\uff0c\u4e0b\u9762\u5c31\u6765\u5206\u6790\u4e00\u4e0b <code class=\"prettyprint\" >ffplay<\/code> \u4ece RTMP \u5730\u9762\u8bfb\u53d6\u5230\u7684\u5e27\u7684 pts \u662f\u4ece\u54ea\u4e2a\u5b57\u6bb5\u63d0\u53d6\u51fa\u6765\u7684\u3002<\/p>\n\n\n\n<p>\u524d\u9762\u51e0\u7bc7\u6587\u7ae0\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=1507\">FFplay\u6e90\u7801\u5206\u6790-rtmp\u5165\u53e3<\/a>\u300b\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=1524\">FFplay\u6e90\u7801\u5206\u6790-rtmp_open<\/a>\u300b\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=1541\">FFplay\u6e90\u7801\u5206\u6790-avformat_open_input<\/a>\u300b\u5df2\u7ecf\u8bb2\u89e3\u4e86 RTMP 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src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-1.png\" alt=\"\" class=\"wp-image-1643\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-1.png 738w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-1-300x132.png 300w\" sizes=\"auto, (max-width: 738px) 100vw, 738px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u4e2a timestamp \u5b57\u6bb5\u5e94\u8be5\u5c31\u662f\u97f3\u9891\u5e27\u7684pts\uff0c\u65f6\u95f4\u662f\u5fae\u5999\u3002\u53ea\u9700\u8981\u5bf9\u7167\u4e00\u4e2a\u8fd9\u4e2a\u65f6\u95f4\u6233\u8ddf data\u5b57\u6bb5\u7684\u6570\u636e\uff0c\u5c31\u80fd\u77e5\u9053 pts \u662f\u4e0d\u662f\u4ece\u8fd9\u91cc\u53d6\u7684\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u6211\u77e5\u9053 find_stream_info() \u4f1a\u8bfb\u53d6\u4e00\u90e8\u5206\u7684\u89c6\u9891\u6570\u636e\uff0c\u63a2\u6d4b\u4e4b\u540e\u4e22\u5f03\u3002\u6240\u4ee5 <code class=\"prettyprint\" >av_read_frame()<\/code> \u62ff\u5230\u7684\u7b2c\u4e00\u4e2a 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srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-3.png 912w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-3-300x113.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-3-768x288.png 768w\" sizes=\"auto, (max-width: 912px) 100vw, 912px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u6211\u6253\u5370\u4e86\u4e00\u4e0b pts \u8ddf \u5934 4\u4e2a\u5b57\u8282\u7684\u5185\u5b58\uff0c\u7136\u540e\uff0c\u6211\u5728 ffplay.c \u6587\u4ef6\u7684 <code class=\"prettyprint\" >av_read_frame()<\/code> \u540e\u9762\u6253\u4e00\u4e2a\u65ad\u70b9\uff0c\u67e5\u770b AVPacket \u7684\u5185\u5bb9\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"836\" height=\"322\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-4.png\" alt=\"\" class=\"wp-image-1646\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-4.png 836w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-4-300x116.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-4-768x296.png 768w\" sizes=\"auto, (max-width: 836px) 100vw, 836px\" \/><\/figure>\n\n\n\n<p>\u6700\u540e\uff0c\u4e24\u4e2a\u65ad\u70b9\u5904 \u7684 \u53d8\u91cf pkt \u7684 pts \u8ddf timestamp \u5b57\u6bb5\u503c\u90fd\u662f 1696\uff0c\u65f6\u95f4\u6233\u4e00\u76f4\uff0c\u7136\u540e data \u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-7.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-8.png\" alt=\"\" width=\"786\" height=\"408\"\/><\/figure>\n\n\n\n<p>\u6240\u4ee5 AVPacket \u7684 pts \u5c31\u662f\u4ece RTMPPacket \u7684 timestamp \u62ff\u51fa\u6765\u7684\uff0cdata \u4e5f\u662f\u57fa\u672c\u76f8\u540c\uff0c\u53ea\u662f RTMPPacket \u7684data \u5934\u4e24\u4e2a\u5b57\u8282\u662f 0xaf 0x01\u3002\u81f3\u6b64\u6211\u4eec\u5df2\u7ecf\u627e\u5230 AVPacket \u7684 pts \u7684\u6765\u6e90\uff0cRTMPPacket \u7684 timestamp \u5c31\u662f RTMP \u683c\u5f0f\u4e2d\u7684 timestamp\uff0c\u5c01\u88c5 RTMP \u5305\u7684\u65f6\u5019\uff0c\u8981\u628a\u65f6\u95f4\u6233\u5f80\u8fd9\u4e2a\u5b57\u6bb5\u4e0a\u586b\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"735\" height=\"329\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-8-2.png\" alt=\"\" class=\"wp-image-1640\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-8-2.png 735w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-8-2-300x134.png 300w\" sizes=\"auto, (max-width: 735px) 100vw, 735px\" \/><\/figure>\n\n\n\n<p>\u7ea0\u6b63\uff0c\u4e0a\u9762\u90a3\u4e2a\u5e94\u8be5\u662f dts \u4e0d\u662f pts\uff0c\u7136\u540e pts \u5e94\u8be5\u662f\u901a\u8fc7\u8fd9\u4e2a <code class=\"prettyprint\" >CompositionTime<\/code> \u8ba1\u7b97\u51fa\u6765\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"669\" height=\"365\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-9.png\" alt=\"\" class=\"wp-image-1641\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-9.png 669w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/ffplay-25-9-300x164.png 300w\" sizes=\"auto, (max-width: 669px) 100vw, 669px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u4e2a CompositionTime \u5e94\u8be5\u662f\u5728 RTMP body 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