{"id":10815,"date":"2023-05-21T20:36:28","date_gmt":"2023-05-21T12:36:28","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10815"},"modified":"2023-09-20T23:12:14","modified_gmt":"2023-09-20T15:12:14","slug":"mp4-video-api-webcodecs-webm","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/05\/mp4-video-api-webcodecs-webm\/","title":{"rendered":"JS audio\u52a0\u56fe\u7247\u5e8f\u5217\u6216canvas\u8f6cwebM\/MP4\u7684\u5b9e\u73b0"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10815\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10815<\/a> \u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202305-canvas-video.png';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/to-video-cover.png\" width=\"437\" height=\"273\" alt=\"\u89c6\u9891\u5408\u6210\u5c01\u9762\u56fe\" class=\"alignright thumb clip size-medium\" \/><\/p>\n<h3>\u4e00\u3001\u751f\u6210WebM\u89c6\u9891<\/h3>\n<p>Web\u7aef\u57fa\u4e8e\u56fe\u50cf\u7d20\u6750\u751f\u6210webM\u683c\u5f0f\u7684\u89c6\u9891\u7b97\u662f\u6bd4\u8f83\u6210\u719f\u7684\u6280\u672f\u4e86\uff0c\u5b9e\u73b0\u4e5f\u6bd4\u8f83\u7b80\u5355\u3002<\/p>\n<p>\u6211\u4e4b\u524d\u662f\u4f7f\u7528whammy.js\u5b9e\u73b0\u7684\uff1a<a href=\"https:\/\/github.com\/antimatter15\/whammy\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/antimatter15\/whammy<\/a><\/p>\n<p>\u4e0d\u8fc7\u6b64\u9879\u76ee\u5df2\u7ecf\u591a\u5e74\u4e0d\u66f4\u65b0\u4e86\uff0c\u770b\u770b\u65f6\u95f4\uff0c\u4e03\u516b\u5e74\u4e86\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-14_174143.png\" width=\"523\" height=\"174\" alt=\"\u65f6\u95f4\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5bf9\u4e8ewebP\u683c\u5f0f\u7684\u56fe\u7247\u5e8f\u5217\uff0cwhammy\u4f1a\u6709<a href=\"https:\/\/github.com\/antimatter15\/whammy\/issues\/70\" rel=\"noopener\" target=\"_blank\">\u9ed1\u5c4f\u7684\u95ee\u9898<\/a>\uff0c\u56e0\u4e3a21\u5e74\u7684\u65f6\u5019Chrome\u4fee\u6539\u4e86 webp \u56fe\u7247\u7684\u7f16\u7801\u65b9\u6cd5\uff0c\u4ece WEBPVP8 \u6539\u4e3a\u4e86 WEBPVP8X\uff0c\u5176\u5e76\u6ca1\u6709\u8fdb\u884c\u53ca\u65f6\u7684\u66f4\u65b0\u3002<\/p>\n<p>\u4e0d\u8fc7JPG\u6216\u8005PNG\u56fe\u7247\u5e8f\u5217\u529f\u80fd\u4e0d\u53d7\u5f71\u54cd\uff0c\u5927\u5bb6\u5982\u679c\u60f3\u4f7f\u7528\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n<h4>webm-writer<\/h4>\n<p>w3c\u5b98\u65b9\u9879\u76eedemo\u4f7f\u7528\u7684\u662f\u66f4\u65b0\u7684 webm-writer.js\uff0c\u8fd9\u4e2a\u9879\u76ee\u662f\u57fa\u4e8e Whammy \u5b9e\u73b0\u7684\uff0c\u6bd4\u8f83\u65b0\uff0c\u6700\u8fd1\u66f4\u65b0\u662f2\u5e74\u524d\u3002<\/p>\n<p>\u9879\u76ee\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/thenickdude\/webm-writer-js\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/thenickdude\/webm-writer-js<\/a><\/p>\n<p>\u8fd9\u91cc\uff0c\u6211\u5c31\u4f7f\u7528webm-writer\u793a\u610f\u4e0b\u5982\u4f55\u4f7f\u7528\u7eafJS\u5728\u524d\u7aef\u751f\u6210webM\u89c6\u9891\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202305\/webm-writer-js-canvas-demo.php\" rel=\"noopener\" target=\"_blank\">webm-writer.js\u5b9e\u73b0webm\u89c6\u9891\u5408\u6210\u5e76\u4e0b\u8f7ddemo<\/a><\/p>\n<p>\u70b9\u51fb\u9875\u9762\u7684\u201c\u751f\u6210webM\u89c6\u9891\u201d\u6309\u94ae\uff0c\u5c31\u53ef\u4ee5\u5728\u4e0b\u65b9\u770b\u5230\u751f\u6210\u597d\u7684webM\u89c6\u9891\u4e86\uff0c\u70b9\u51fb\u64ad\u653e\uff0c\u53ef\u4ee5\u9884\u89c8\u6548\u679c\uff0c\u70b9\u51fb\u4e0b\u8f7d\uff0c\u53ef\u4ee5\u4e0b\u8f7d\u8be5webM\u89c6\u9891\u3002<\/p>\n<p>\u652f\u6301Chrome\uff0cFirefox\u4ee5\u53caSafari\u6d4f\u89c8\u5668\uff08\u684c\u9762Safari 16+\uff09\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e0b\u9762\u7684MP4\u5f55\u5c4f\u5c31\u662f\u6211Chrome 112\u7248\u672c\u4e0b\u7684\u5b9e\u73b0\u6548\u679c\uff08\u4e0d\u52a8\u70b9\u51fb\u64ad\u653e\uff09\uff1a<\/p>\n<p><video src='\/\/image.zhangxinxu.com\/video\/blog\/202305\/book-webm.mp4' type=\"video\/mp4\" width=\"350\" height=\"562\" preload=\"auto\" muted autoplay autobuffer loop x-webkit-airplay=\"allow\" x5-video-player-type=\"h5\" x5-video-player-fullscreen=\"true\" x5-video-orientation=\"portraint\" webkit-playsinline=\"true\" playsinline=\"true\" \u200b\u200b\u200b\u200bposter=\"\/\/image.zhangxinxu.com\/image\/blog\/201806\/poster.png\"><\/video><\/p>\n<p><strong>\u4ee3\u7801\u793a\u610f<\/strong><\/p>\n<pre>\/\/ \u70b9\u51fb\u6309\u94ae\u7684webM\u751f\u6210\r\nbutton.onclick = function () {\r\n    \/\/ \u6784\u9020webm\u751f\u6210\u5668\r\n    var videoWriter = new WebMWriter({\r\n        \/\/ \u6bcf\u79d230\u5e27\r\n        frameRate: 30\r\n    });\r\n    \/\/ \u521b\u5efa\u5c4f\u5e55\u5916 canvas\r\n    var canvas = document.createElement('canvas');\r\n    \/\/ \u603b\u517150\u5e27canvas\u7ed8\u5236\r\n    var currentFrame = 1;\r\n    var maxFrame = 50;\r\n    for (var index = 1; index &lt;= maxFrame; index++) {\r\n        currentFrame = index;\r\n        \/\/ \u7ed8\u5236\u51fd\u6570\u7565\r\n        draw();\r\n        videoWriter.addFrame(canvas);\r\n        \/\/ \u5982\u679c\u662f\u6700\u540e\u4e00\u5e27\uff0c\u90a3\u5c31\u5b8c\u6210\r\n        if (currentFrame === maxFrame &amp;&amp; complete) {\r\n          videoWriter.complete().then(function(webMBlob) {\r\n            var blobUrl = URL.createObjectURL(webMBlob);\r\n            \/\/ blobUrl\u5c31\u662fwebM\u89c6\u9891\u5730\u5740\u4e86\uff0c\u53ef\u64ad\u653e\uff0c\u53ef\u4e0b\u8f7d\r\n          });     \r\n        }\r\n    }\r\n};<\/pre>\n<p>webM\u89c6\u9891\u5408\u6210\u7684\u5b9e\u73b0\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u4e3b\u8981\u5c31\u662f\u4e0b\u9762\u4e09\u6b65\uff1a<\/p>\n<ol>\n<li>\u6784\u9020\uff1a\n<pre>var videoWriter = new WebMWriter(options);<\/pre>\n<\/li>\n<li>\u6dfb\u52a0\u5e27\uff1a\n<pre>videoWriter.addFrame(canvas);<\/pre>\n<\/li>\n<li>\u7ed3\u675f\u6dfb\u52a0\uff0c\u5b8c\u6210\u751f\u6210\uff1a\n<pre>videoWriter.complete().then(function(webMBlob) {\r\n    video.src = URL.createObjectURL(webMBlob);\r\n})<\/pre>\n<\/li>\n<\/ol>\n<p><strong>\u5176\u4ed6<\/strong><\/p>\n<ul>\n<li>webm-writer\u4f3c\u4e4e\u4e0d\u652f\u6301\u76f4\u63a5\u4f7f\u7528\u56fe\u50cf\u5143\u7d20\u4f5c\u4e3a\u5e27\u5185\u5bb9\u6dfb\u52a0\uff0c\u5177\u4f53\u6211\u6ca1\u6d4b\uff0c\u6211\u662f\u770b\u6e90\u7801\u5f97\u51fa\u7684\u7ed3\u8bba\uff0c\u8fd9\u4e2a\u5c31\u6ca1\u6709 Whammy \u597d\u7528\u3002<\/li>\n<li>webm-writer\u597d\u50cf\u90fd\u662f\u7528\u7684webP\u56fe\u50cf\u8fdb\u884c\u89c6\u9891\u5408\u6210\u7684\uff0c\u6240\u4ee5\uff0c\u56fe\u50cf\u4e00\u5b9a\u4f1a\u6709\u635f\u5931\uff0c\u4e0d\u53ef\u80fd100%\u8fd8\u539f\u3002<\/li>\n<\/ul>\n<p>\u5176\u5b9e\uff0c\u6709\u4e86canvas\u6d41\uff0c\u501f\u52a9MediaRecorder API\uff0c\u6211\u4eec\u65e0\u9700\u4f7f\u7528\u7b2c\u4e09\u65b9\u5f00\u6e90\u7684JS\u7ec4\u4ef6\uff0c\u4e5f\u80fd\u5b9e\u73b0webM\u89c6\u9891\u7684\u5408\u5e76\uff0c\u4e0b\u9762\u662f\u6848\u4f8b\uff0c\u9002\u5408\u6444\u50cf\u5934\u7684\u89c6\u9891\u6d41\u4fdd\u5b58\u4e3a\u89c6\u9891\u7684\u573a\u666f\u3002<\/p>\n<pre>function record(canvas, time) {\r\n    var recordedChunks = [];\r\n    return new Promise(function (res, rej) {\r\n        var stream = canvas.captureStream(25 \/*fps*\/);\r\n        mediaRecorder = new MediaRecorder(stream, {\r\n            mimeType: \"video\/webm; codecs=vp9\"\r\n        });\r\n        \r\n        \/\/\u6570\u636e\u8bb0\u5f55\u7684\u8d77\u59cb\u65f6\u95f4 `time || 4000 ms`\r\n        mediaRecorder.start(time || 4000);\r\n\r\n        mediaRecorder.ondataavailable = function (event) {\r\n            recordedChunks.push(event.data);\r\n             \/\/`dataavilable`\u4e8b\u4ef6\u7ed3\u675f\u540e\u6267\u884c\uff0c\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\r\n            if (mediaRecorder.state === 'recording') {\r\n                mediaRecorder.stop();\r\n            }\r\n        }\r\n\r\n        mediaRecorder.onstop = function (event) {\r\n            var blob = new Blob(recordedChunks, {type: \"video\/webm\" });\r\n            var url = URL.createObjectURL(blob);\r\n            res(url);\r\n        }\r\n    })\r\n}<\/pre>\n<p>\u7136\u800c\uff0c\u65e0\u8bba\u662fwhammy\u8fd8\u662fwebm-writer\uff0c\u867d\u7136\u7528\u6765\u5408\u6210webM\u89c6\u9891\u5f88\u65b9\u4fbf\uff0c\u4f46\u662f\u6709\u4e2a\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u65e0\u6cd5\u6dfb\u52a0\u97f3\u9891\u8fdb\u884c\uff0c\u4e5f\u5c31\u662f\u89c6\u9891\u5408\u6210\u7684\u65f6\u5019\uff0c\u6ca1\u6cd5\u5e26\u58f0\u97f3\u3002<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u5c31\u662f\u6211\u4e4b\u524d\u9047\u5230\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u540e\u6765\u5bfb\u6c42\u4e86\u4f7f\u7528ffmpeg.wasm\u6765\u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u4e4b\u524d\u8fd9\u7bc7\u6587\u7ae0\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2021\/03\/ffmpeg-wasm-audio-video-merge\/\">\u501f\u52a9ffmpeg.wasm\u7eaf\u524d\u7aef\u5b9e\u73b0\u591a\u97f3\u9891\u548c\u89c6\u9891\u7684\u5408\u6210<\/a>\u201d\u7684\u7531\u6765\u3002<\/p>\n<p>\u957f\u4e45\u4ee5\u6765\uff0c\u6211\u4e00\u76f4\u4ee5\u4e3a\u6b64\u4e8b\u65e0\u89e3\uff0c\u4f46\u662f\uff0c\u968f\u7740\u6d4f\u89c8\u5668\u7684\u53d1\u5c55\uff0c\u4e8b\u60c5\u51fa\u73b0\u4e86\u8f6c\u673a\uff0cChrome 94\u5f00\u59cb\u652f\u6301\u4e86WebCodecs API\uff08\u517c\u5bb9\u6027\u89c1\u4e0b\u56fe\uff09\uff0c\u8fd9\u662f\u4e2a\u56fe\u50cf\u3001\u97f3\u9891\u548c\u89c6\u9891\u7f16\u89e3\u7801API\u96c6\u5408\uff0c\u5f88\u5f3a\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-23_221347.png\" width=\"654\" height=\"232\" alt=\"WebCodecs\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6709\u4e86WebCodecs API\uff0c\u7eaf\u524d\u7aef\uff0c\u4e0d\u4f9d\u8d56\u4efb\u4f55\u63d2\u4ef6\uff0c\u8fc5\u901f\u5b9e\u73b0\u5e26\u97f3\u4e50\u7684\u89c6\u9891\u5408\u6210\u6210\u4e3a\u4e86\u53ef\u80fd\uff0c\u8fd9\u662f\u672c\u6587\u8981\u4ecb\u7ecd\u7684\u91cd\u70b9\u3002<\/p>\n<h3>\u4e8c\u3001\u5e26audio\u58f0\u97f3\u7684webM\u5408\u6210<\/h3>\n<p>\u5b9e\u73b0\u539f\u7406\u4e5f\u6bd4\u8f83\u597d\u7406\u89e3\uff0cAudioEncoder\u7f16\u7801\u97f3\u9891\uff0cVideoEncoder\u7f16\u7801\u89c6\u9891\uff0c\u7136\u540e\u8fdb\u884c\u5408\u5e76\u5c01\u88c5\u3002<\/p>\n<p>\u5176\u4e2d\uff0c\u7f16\u7801\u89c6\u9891\u548c\u7f16\u7801\u97f3\u9891\u76f8\u5173\u7684API\u5e76\u4e0d\u5b8c\u5168\u5bf9\u7b49\uff08\u6839\u636e\u6211\u770b\u4e00\u4e9b\u8001\u7684\u8d44\u6599\uff0c\u4e00\u5f00\u59cb\uff0c\u4e5f\u5c31\u662f\u89c4\u8303\u9636\u6bb5\uff0c\u6d4f\u89c8\u5668\u8fd8\u6ca1\u652f\u6301\u7684\u65f6\u5019\uff0c\u662f\u8fd1\u4f3c\u7684\uff0c\u4f8b\u5982\u97f3\u9891\u4e2d\u8fd8\u6709AudioFrame\u7684\u6982\u5ff5\uff0c\u73b0\u5728\u6ca1\u6709\u4e86\uff0c\u53ea\u6709VideoFrame\uff09\u3002<\/p>\n<p>\u539f\u7406\u597d\u61c2\uff0c\u4f46\u662f\u5b9e\u64cd\u7ec6\u8282\u5374\u4e0d\u7b80\u5355\u3002<\/p>\n<p>\u56e0\u4e3a\u6d89\u53ca\u5230\u975e\u5e38\u591a\u7684\u97f3\u89c6\u9891\u6982\u5ff5\uff0c\u548c\u5404\u79cdAPI\u5bf9\u8c61\uff0c\u4f8b\u5982\uff0cWebCodecs API\u4e2d\u7684Audio\u7f16\u7801\u6709\u4e2a\u540d\u53ebAudioData\u7684\u6982\u5ff5\uff0c\u8fd9\u662f\u65b0\u7684\u6982\u5ff5\uff0c\u548cWeb Audio API\u4e2ddecodeAudioData(audioData)\u4e2d\u7684audioData\u53c2\u6570\u4e0d\u662f\u4e00\u4e2a\u4e1c\u897f\u3002<\/p>\n<p>\u60f3\u8981\u5b8c\u5168\u4e86\u89e3\uff0c\u975e\u4e00\u671d\u4e00\u5915\uff0c\u54ea\u6015\u4e00\u5468\u4e00\u6708\uff0c\u90fd\u4e0d\u592a\u53ef\u80fd\uff0c\u4e5f\u6ca1\u6709\u5fc5\u8981\u3002<\/p>\n<p>\u9664\u975e\u4f60\u662f\u4e13\u95e8\u4ece\u4e8b\u97f3\u89c6\u9891\u5f00\u53d1\u7684\u524d\u7aef\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u52a9\u793e\u533a\u7684\u529b\u91cf\u5e2e\u52a9\u6211\u4eec\u4e0a\u624bWebCodecs API\u7684\u4f7f\u7528\u3002<\/p>\n<p>\u4e0d\u8fc7\uff0c\u7531\u4e8eWebCodecs API\u521a\u51fa\u6765\u6ca1\u591a\u4e45\uff0c\u76ee\u524d\u5b66\u4e60\u8d44\u6e90\u6709\u9650\uff0cMDN\u4e0a\u867d\u7136\u6709\u5bf9API\u7684\u4ecb\u7ecd\uff0c\u4f46\u57fa\u672c\u4e0a\u90fd\u770b\u4e0d\u5230example\u6f14\u793a\uff0c\u6240\u4ee5\uff0c\u76f8\u5173\u7684\u5b66\u4e60\u4e0e\u5c1d\u8bd5\uff0c\u8fd8\u662f\u82b1\u4e86\u6211\u4e0d\u5c11\u65f6\u95f4\u7684\u3002<\/p>\n<h4>webm-muxer\u9879\u76ee<\/h4>\n<p>\u627e\u5230\u4e86\u4e00\u4e2a\u57fa\u4e8eWebCodecs API\u5b9e\u73b0\u7684Webm\u89c6\u9891\u5408\u5e76\u9879\u76ee\uff1a<a href=\"https:\/\/github.com\/Vanilagy\/webm-muxer\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/Vanilagy\/webm-muxer<\/a><\/p>\n<p>muxer \u5176\u5b9e\u662f\u8ba1\u7b97\u673a\u4e2d\u7684\u4e00\u4e2a\u672f\u8bed\uff0c\u6307\u5408\u5e76\uff0c\u4f8b\u5982\u5c06\u89c6\u9891\u6587\u4ef6\u3001\u97f3\u9891\u6587\u4ef6\u548c\u5b57\u5e55\u6587\u4ef6\u5408\u5e76\u4e3a\u67d0\u4e00\u4e2a\u89c6\u9891\u683c\u5f0f\u5c31\u662f\u5178\u578b\u7684muxer\uff0c\u8fd8\u6709\u4e2ademuxer\uff0c\u8868\u793a\u62c6\u5206\u3002<\/p>\n<p>\u6b64\u9879\u76ee\u63d0\u4f9b\u4e86<a href=\"https:\/\/vanilagy.github.io\/webm-muxer\/demo\/\" rel=\"noopener\" target=\"_blank\">\u4e24\u4e2ademo<\/a>\uff0c\u53ef\u4ee5\u5c06\u9ea6\u514b\u98ce\u5f55\u97f3\u548ccanvas\u7ed8\u5236\u5408\u5e76\u6210webm\u89c6\u9891\uff0c\u5982\u4e0b\u622a\u56fe\u793a\u610f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-21_161155.png\" width=\"690\" height=\"307\" alt=\"demo\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4e0d\u77e5\u9053\u662f\u4e0d\u662f\u6211\u8bbe\u5907\u7684\u95ee\u9898\uff0c\u6211\u4fdd\u5b58\u7684\u89c6\u9891\u662f\u7eff\u5c4f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-21_161357.png\" width=\"207\" height=\"173\" alt=\"\u89c6\u9891\u7eff\u5c4f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4e0d\u8fc7\u8fd9\u4e2a\u4e0d\u91cd\u8981\uff0c\u91cd\u8981\u7684\u662f\u6b64demo\u4e3a\u6211\u4eec\u7684\u9700\u6c42\u89e3\u51b3\u63d0\u4f9b\u4e86\u91cd\u8981\u7684\u53c2\u8003\u3002<\/p>\n<h4>demo\u4e4bcanvas+mp3=&gt;webm\u89c6\u9891<\/h4>\n<p>\u4f60\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202305\/webm-muxer-canvas-audio-video-demo.php\" rel=\"noopener\" target=\"_blank\">webm-muxer\u5b9e\u73b0\u5e26\u97f3\u4e50\u7684webm\u89c6\u9891demo<\/a><\/p>\n<p>\u5728Chrome\u6d4f\u89c8\u5668\u4e0b\uff0c\u70b9\u51fb\u201c\u751f\u6210webm\u201d\u6309\u94ae\uff0c\u7a0d\u7b49\u6570\u79d2\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u5408\u6210\u7684webm\u89c6\u9891\u4e86\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-21_163418.png\" width=\"507\" height=\"403\" alt=\"\u89c6\u9891\u751f\u6210\u6548\u679c\u622a\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u8fd8\u53ef\u4ee5\u70b9\u51fb\u53f3\u4fa7\u7684\u201c\u4e0b\u8f7d\u201d\u6309\u94ae\u4e0b\u8f7d\u6b64webM\u89c6\u9891\u3002<\/p>\n<h4>\u5b9e\u73b0\u8fc7\u7a0b\u6982\u8ff0<\/h4>\n<p><strong>1. \u6784\u9020<\/strong><\/p>\n<p>\u6784\u9020\u5408\u5e76\u5668muxer\uff0c\u97f3\u89c6\u9891\u89e3\u7801\u5668\uff0c\u4e0b\u9762\u8fd9\u4e9b\u4ee3\u7801\u7ed3\u6784\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u4e00\u4e9b\u53c2\u6570\u503c\uff0c\u4f8b\u5982\u89c6\u9891\u5c3a\u5bf8\u548c\u5e27\u7387\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u81ea\u884c\u8bbe\u7f6e\u3002<\/p>\n<pre>\/\/ \u6784\u9020\u5305\u88c5\u5668\r\nvar muxer = new WebMMuxer.Muxer({\r\n    target: new WebMMuxer.ArrayBufferTarget(),\r\n    video: {\r\n        codec: 'V_VP9',\r\n        width: 600,\r\n        height: 400,\r\n        frameRate: 30\r\n    },\r\n    audio: {\r\n        codec: 'A_OPUS',\r\n        sampleRate: 48000,\r\n        numberOfChannels: 1\r\n    },\r\n    firstTimestampBehavior: 'offset'\r\n});\r\n\r\n\/\/ \u97f3\u89c6\u9891\u7f16\u7801\u5668\uff0c\u8fd9\u91cc\u4f7f\u7528\u7684\u662fWebCodese API\r\nvar videoEncoder = new VideoEncoder({\r\n    output: (chunk, meta) =&gt; muxer.addVideoChunk(chunk, meta),\r\n    error: e =&gt; console.error(e)\r\n});\r\nvideoEncoder.configure({\r\n    codec: 'vp09.00.10.08',\r\n    width: 600,\r\n    height: 400,\r\n    bitrate: 1e6\r\n});\r\n\/\/ \u97f3\u9891\u7684\r\nvar audioEncoder = new AudioEncoder({\r\n    output: (chunk, meta) =&gt; muxer.addAudioChunk(chunk, meta),\r\n    error: e =&gt; console.error(e)\r\n});\r\naudioEncoder.configure({\r\n    codec: 'opus',\r\n    numberOfChannels: 1,\r\n    sampleRate: 22050,\r\n    bitrate: 64000\r\n});<\/pre>\n<p><span class=\"s\">\u63d0\u793a\uff1a\u5982\u679c\u9047\u5230\u4e0d\u517c\u5bb9\u7684\u63d0\u793a\uff08Input audio buffer is incompatible with codec parameters\uff09\uff0c\u4e00\u822c\u90fd\u662fconfigure()\u4e2d\u7684sampleRate\u8bbe\u7f6e\u7684\u4e0d\u5bf9\uff0c\u548c\u97f3\u9891\u6587\u4ef6\u7684\u91c7\u6837\u7387\u4e0d\u5339\u914d\u3002<\/span><\/p>\n<p><strong>2. \u97f3\u9891\u7f16\u7801<\/strong><\/p>\n<p>\u8fd9\u91cc\u662f\u5b9e\u73b0\u7684\u96be\u70b9\uff0c\u6211\u4e00\u5f00\u59cb\u662f\u5c1d\u8bd5\u76f4\u63a5fetch MP3\u97f3\u9891\u6587\u4ef6\u6d41\uff0c\u7136\u540e\u501f\u52a9AudioEncoder\u8fdb\u884c\u7f16\u7801\uff0c\u7ed3\u679c\u53d1\u73b0\u8def\u8d70\u4e0d\u901a\uff0c\u603b\u662f\u63d0\u793a\uff0c\u4e0d\u662f\u9700\u8981\u7684\u97f3\u9891\u6570\u636e\u3002<\/p>\n<p>\u67e5\u4e86\u5f88\u591a\u8d44\u6599\uff0c\u4e5f\u672a\u89c1\u76f8\u5173\u5b9e\u73b0\u6848\u4f8b\uff0c\u9690\u9690\u89c9\u5f97\uff0c\u6280\u672f\u4e0a\u5c31\u4e0d\u901a\uff0c\u4e0d\u7136\u4e0d\u4f1a\u90fd\u662f\u501f\u52a9MediaDevices\u7684getUserMedia()\u65b9\u6cd5\u5b9e\u73b0\u7684\u4f8b\u5b50\uff0c\u4e5f\u5c31\u662f\u9ea6\u514b\u98ce\u6216\u6444\u50cf\u5934\u6355\u6349\u7684\u6570\u636e\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u5c31\u9000\u800c\u6c42\u5176\u6b21\uff0c\u97f3\u9891\u64ad\u653e\u7684\u65f6\u5019\uff0c\u57fa\u4e8e\u64ad\u653e\u7684\u97f3\u9891\u6d41\u8fdb\u884c\u7f16\u7801\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4f55demo\u9875\u9762\u5408\u6210\u65f6\u5019\uff0c\u4f1a\u64ad\u653e\u97f3\u9891\u7684\u539f\u56e0\u3002<\/p>\n<pre>\/\/ \u97f3\u9891\u8d44\u6e90\u83b7\u53d6\r\nconst myAudio = new Audio();\r\nfetch(audio.src).then(res =&gt; {\r\n    var reader = res.body.getReader();\r\n    return reader.read().then(result =&gt; {\r\n        return result;\r\n    });\r\n}).then(data =&gt; {\r\n    var blob = new Blob([data.value], {\r\n        type: 'audio\/mp3'\r\n    });\r\n    var blobUrl = URL.createObjectURL(blob);\r\n\r\n    \/\/ \u521b\u5efa\u97f3\u9891\u5bf9\u8c61\r\n    myAudio.src = blobUrl;\r\n    \/\/ \u9690\u85cf\u4e0d\u53ef\u89c1\r\n    myAudio.hidden = true;\r\n    \/\/ \u9759\u97f3\uff0c\u907f\u514d\u5e72\u6270\uff08\u9759\u97f3\u540e\uff0c\u5408\u6210\u7684\u89c6\u9891\u4e5f\u4f1a\u6ca1\u58f0\u97f3\uff09\r\n    \/\/ myAudio.muted = true;\r\n    \/\/ \u5728\u9875\u9762\u5185\uff0c\u65b9\u4fbf\u64ad\u653e\r\n    document.body.append(myAudio);\r\n});\r\n\r\n\/\/ \u6355\u6349\u64ad\u653e\u7684\u97f3\u8f68\r\nconst audioTrack = myAudio.captureStream().getAudioTracks()[0];\r\n\/\/ MediaStreamTrackProcessor\u53ef\u4ee5\u7528\u6765\u751f\u6210\u5a92\u4f53\u5e27\u6d41\r\nlet trackProcessor = new MediaStreamTrackProcessor({\r\n    track: audioTrack\r\n});\r\n\r\n\/\/ \u97f3\u9891\u64ad\u653e\uff0c\u5e76\u5b9e\u65f6\u6293\u53d6\u89c6\u9891\u6d41\r\n\/\/ \u4ea4\u7ed9webcodecs API\u8fdb\u884c\u7f16\u7801\r\nmyAudio.play();\r\n\/\/ \u7f16\u7801\u97f3\u9891\u6570\u636e\r\nlet consumer = new WritableStream({\r\n    write(audioData) {\r\n        if (!audioEncoder) {\r\n            return;\r\n        }\r\n        audioEncoder.encode(audioData);\r\n        audioData.close();\r\n    }\r\n});\r\ntrackProcessor.readable.pipeTo(consumer);<\/pre>\n<p><span class=\"s\">\u8fd9\u91cc\u53ef\u80fd\u662f\u6211\u7684\u79ef\u7d2f\u8fd8\u4e0d\u591f\uff0c\u5982\u679c\u6709\u8c01\u77e5\u9053\u76f4\u63a5fetch\u97f3\u9891\u5e76encode()\u7684\u65b9\u6cd5\uff0c\u6b22\u8fce\u4e0d\u541d\u8d50\u6559\u3002<\/span><\/p>\n<p><strong>\u66f4\u65b0\u4e8e2023\u5e749\u670820\u65e5<\/strong><\/p>\n<p>\u627e\u5230\u4e86\u76f4\u63a5fetch\u97f3\u9891\u7684\u65b9\u6cd5\u4e86\uff0c\u53ef\u4ee5\u53c2\u89c1\u4e0b\u9762\u7684MP4\u5408\u6210demo\u793a\u610f\u3002<\/p>\n<p><strong>3. \u89c6\u9891\u7f16\u7801<\/strong><\/p>\n<p>\u89c6\u9891\u7f16\u7801\u6848\u4f8b\u6bd4\u8f83\u591a\uff0c\u76f8\u5bf9\u7b80\u5355\u7684\u591a\u3002<\/p>\n<p>\u89c6\u9891\u4e2d\uff0c\u6709\u4e13\u95e8\u7684VideoFrame\uff0c\u53ea\u9700\u8981\u8fdb\u884c\u5236\u5b9a\u6bcf\u4e00\u5e27\u7684\u8d44\u6e90\u3001\u65f6\u95f4\u95f4\u9694\uff0c\u4ee5\u53ca\u5173\u952e\u5e27\u5373\u53ef\u3002<\/p>\n<p>\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528canvas\u4f5c\u4e3a\u8d44\u6e90\uff0cIMG\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n<p>demo\u4e2d\u7684\u5b9e\u73b0\u793a\u610f\uff1a<\/p>\n<pre>\/\/ \u521b\u5efa\u5c4f\u5e55\u5916 canvas\r\nvar canvas = document.createElement('canvas');\r\ncanvas.width = 600;\r\ncanvas.height = 400;\r\n\r\n\/\/ \u7f16\u7801\u89c6\u9891\u6570\u636e\r\nvar startTime = document.timeline.currentTime;\r\nvar frameCounter = 0;\r\n\/\/ handleDraw\u6e90\u7801\u53ef\u53f3\u952e\u9875\u9762\u67e5\u770b\r\n\/\/ \u6bcf\u6b21\u7ed8\u5236\u90fd\u4f1a\u8d70\u4e00\u904d\u540e\u9762\u7684function\u51fd\u6570\r\nhandleDraw(canvas, function () {\r\n    \/\/ \u5b9a\u4e49\u89c6\u9891\u5e27\r\n    let frame = new VideoFrame(canvas, {\r\n        timestamp: (frameCounter * 1000 \/ 30) * 1000\r\n    });\r\n\r\n    frameCounter++;\r\n    \/\/ \u5236\u5b9a\u5173\u952e\u5e27\uff0c\u8fd9\u662f\u89c4\u8303\u8981\u6c42\uff0c\u6700\u591a\u591a\u5c11\u79d2\u4e4b\u5185\u4e00\u5b9a\u8981\u6709\u4e2a\u5173\u952e\u5e27\u7684\r\n    videoEncoder.encode(frame, { \r\n        keyFrame: frameCounter % 30 === 0 \r\n    });\r\n    frame.close();\r\n});<\/pre>\n<p><strong>4. \u7ed3\u675f\u7f16\u7801<\/strong><\/p>\n<p>\u5f53\u89c6\u9891\u5b8c\u5168\u7ed8\u5236\u7ed3\u675f\uff0c\u540c\u65f6\u786e\u4fdd\u97f3\u9891\u64ad\u653e\u5230\u89c6\u9891\u65f6\u957f\uff0c\u53ef\u4ee5\u7ed3\u675f\u3002<\/p>\n<pre>async () =&gt; {\r\n    await videoEncoder?.flush();\r\n    await audioEncoder?.flush();\r\n    muxer.finalize();\r\n};<\/pre>\n<p><strong>5. \u89c6\u9891\u751f\u6210<\/strong><\/p>\n<pre>let { buffer } = muxer.target;\r\n\/\/ buffer\u5c31\u662f\u89c6\u9891\u6570\u636e\r\n\/\/ \u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u4f5c\u4e3ablobURL\u5730\u5740\u8fdb\u884c\u64ad\u653e\u6216\u4e0b\u8f7d\r\nvar blobUrl = URL.createObjectURL(new Blob([buffer]));<\/pre>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5b9e\u73b0\u5168\u90e8\u8fc7\u7a0b\u3002<\/p>\n<h3>\u4e09\u3001MP4\u89c6\u9891\u7684\u5408\u6210<\/h3>\n<p>webm-muxer\u9879\u76ee\u7684\u4f5c\u8005\u8fd8\u5f04\u4e86\u4e2a\u7c7b\u4f3c\u7684\u9879\u76ee\uff0cmp4-muxer\uff0c\u53ef\u4ee5\u8f85\u52a9\u6211\u4eec\u5728Web\u6d4f\u89c8\u5668\u4e2d\u5408\u6210MP4\u89c6\u9891\u3002<\/p>\n<p>\u9879\u76ee\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/Vanilagy\/mp4-muxer\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/Vanilagy\/mp4-muxer<\/a><\/p>\n<p>\u8bed\u6cd5\u548cwebm-muxer\u9879\u76ee\u7c7b\u4f3c\uff0c\u6211\u5c31\u4e0d\u8d58\u8ff0\u4e86\uff0c\u6211\u4eec\u76f4\u63a5\u770bdemo\u5b9e\u73b0\u7684\u6548\u679c\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202305\/mp4-muxer-canvas-audio-video-demo.php\" rel=\"noopener\" target=\"_blank\">mp4-muxer\u5b9e\u73b0\u5e26\u58f0\u97f3\u7684mp4\u89c6\u9891demo<\/a><\/p>\n<p>\u4e0b\u9762\u7684\u89c6\u9891\u5c31\u662f\u751f\u6210\u7684\uff08\u70b9\u51fb\u64ad\u653e\uff0c\u6709\u97f3\u9891\uff0c\u6ce8\u610f\u573a\u5408\uff09\uff1a<\/p>\n<p><video src='\/\/image.zhangxinxu.com\/video\/blog\/202305\/muxer-with-audio.mp4' type=\"video\/mp4\" width=\"300\" height=\"200\" controls x-webkit-airplay=\"allow\" x5-video-player-type=\"h5\" x5-video-player-fullscreen=\"true\" x5-video-orientation=\"portraint\" webkit-playsinline=\"true\" playsinline=\"true\"><\/video><\/p>\n<p>\u867d\u8bf4\u4ee3\u7801\u7c7b\u4f3c\uff0c\u4f46\u4e5f\u5b8c\u5168\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u5176\u4e2d\u4e00\u4e2a\u533a\u522b\u5c31\u662f\uff0cMP4\u89c6\u9891\u5408\u6210\u5bf9\u97f3\u9891\u6587\u4ef6\u7684\u8d28\u91cf\u8981\u6c42\u66f4\u9ad8\u3002<\/p>\n<p>\u91c7\u6837\u7387\u81f3\u5c11\u662f44100\uff0c\u54c1\u8d28\u8f83\u4f4e\u7684\u97f3\u9891\u662f\u4e0d\u884c\u7684\u3002<\/p>\n<p>\u53ef\u80fd\u662fmp4a\u7f16\u7801\u683c\u5f0f\u8981\u6c42\u7684\uff0c\u4e3a\u6b64\uff0c\u6211\u4e13\u95e8\u4e0b\u8f7d\u4e86\u4e2a\u9ad8\u8d28\u91cf\u7684MP3\u80cc\u666f\u97f3\u4e50\uff0c\u8fd9\u662f\u76f8\u5173\u7684\u914d\u7f6e\uff1a<\/p>\n<pre>audioEncoder.configure({\r\n    codec: 'mp4a.40.2',\r\n    numberOfChannels: 2,\r\n    sampleRate: 44100,\r\n    bitrate: 128000\r\n});<\/pre>\n<p>\u4ee3\u7801\u5b9e\u73b0\u903b\u8f91\u548cwebm-muxer\u7c7b\u4f3c\uff0c\u6211\u5c31\u4e0d\u91cd\u590d\u5c55\u793a\u4e86\uff0c\u4ee3\u7801\u90fd\u5728demo\u9875\u9762\u4e0a\uff0c\u90fd\u662f\u539f\u751f\u7684\uff0c\u975e\u5e38\u9002\u5408\u5927\u5bb6\u5b66\u4e60\u4e0a\u624bWebCodecs API\u3002<\/p>\n<p><strong>\u66f4\u65b0\u4e8e2023-09-20<\/strong><\/p>\n<p>\u65e0\u9700\u64ad\u653e\u97f3\u9891\uff0c\u76f4\u63a5\u6839\u636eaudioData\u6570\u636e\u5408\u6210MP4\u7684demo\u5f04\u51fa\u6765\u4e86\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202305\/canvas-audio-to-mp4-video-demo.php\" rel=\"noopener\" target=\"_blank\">canvas\u56fe\u7247\u5e8f\u5217\u52a0\u58f0\u97f3\u5408\u6210mp4\u89c6\u9891demo<\/a><\/p>\n<p>1.67s\u7684\u89c6\u9891\uff0c80ms\u5c31\u5b8c\u6210\u4e86\uff0c\u5f3a\u65e0\u654c\u3002<\/p>\n<p>\u5174\u594b\uff0c\u6fc0\u52a8\uff0cffmpeg\u518d\u89c1\u4e86\u3002<\/p>\n<h4>\u4e0d\u5e26\u97f3\u9891\u7684MP4\u5408\u6210<\/h4>\n<p>\u5982\u679c\u4e0d\u5e26\u97f3\u9891\uff0c\u4f7f\u7528WebCodecs API\u5408\u6210mp4\u89c6\u9891\u7684\u901f\u5ea6\u6781\u5feb\uff0c\u79d2\u751f\u6210\u3002<\/p>\n<p>\u6709\u5174\u8da3\u60f3\u8981\u4f53\u9a8c\u7684\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202305\/mp4-muxer-canvas-to-video-demo.php\" rel=\"noopener\" target=\"_blank\">mp4-muxer\u5b9e\u73b0\u7eaf\u753b\u9762mp4\u89c6\u9891demo<\/a><\/p>\n<p>\u70b9\u51fb\u6309\u94ae\u540e\uff0c\u53ea\u9700\u89810.02\u79d2\u5c31\u53ef\u4ee5\u5f97\u5230\u89c6\u9891\uff0c\u5feb\u5982\u95ea\u7535\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-21_200804.png\" width=\"476\" height=\"424\" alt=\"MP4\u89c6\u9891\u65f6\u95f4\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>MP4\u89c6\u9891\u6240\u6709\u6d4f\u89c8\u5668\uff0c\u6240\u6709\u64cd\u4f5c\u7cfb\u7edf\u90fd\u80fd\u64ad\u653e\uff0c\u56e0\u6b64\uff0c\u4e0a\u9762\u8fd9\u4e2ademo\u53ef\u80fd\u53cd\u800c\u4f1a\u66f4\u52a0\u5b9e\u7528\u3002<\/p>\n<h3>\u4e94\u3001\u7ec8\u4e8e\u7ed3\u8bed\u4e86<\/h3>\n<p>\u7ee7\u4e0a\u4e00\u7bc7\u4f7f\u7528\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/05\/js-imagedecoder-api-gif\/\">WebCodecs API\u4e4bImageDecoder\u89e3\u7801GIF<\/a>\u201d\u5df2\u7ecf\u8fc7\u53bb\u4e24\u5468\u4e86\uff0c\u4e00\u76f4\u5728\u76d8\u8fd9\u7bc7\u6587\u7ae0\uff0c\u4e0d\u5bb9\u6613\uff0c\u7ec8\u4e8e\u8981\u53d1\u5e03\u4e86\u3002<\/p>\n<p>\u7b97\u662f\u76ee\u524d\u5173\u4e8e\u6d4f\u89c8\u5668\u97f3\u89c6\u9891\u5408\u6210\uff0c\u5c24\u5176WebCodecs API\u8fd9\u5757\u6bd4\u8f83\u7a00\u7f3a\u7684\u5185\u5bb9\u4e86\u3002<\/p>\n<p>\u597d\u4e1c\u897f\u5c31\u662f\u8981\u8ba9\u5927\u5bb6\u90fd\u77e5\u9053\u7684\uff0c\u6b22\u8fce<button onclick=\"shareWeixin.click()\" class=\"entry-share-btn\">\u5206\u4eab<\/button>\uff0c\u70b9\u8d5e\u3002<\/p>\n<p>\u5728\u5b66\u4e60\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fd8\u662f\u53d1\u73b0\u81ea\u5df1\u5bf9\u5404\u79cdstream\u3001buffer\uff08\u5982sharedArrayBuffer\u3001ringbuffer\uff09\u3001chunk\u3001track\u7b49\u7406\u89e3\u8fd8\u4e0d\u591f\u6df1\u5165\uff0c\u8fd8\u9700\u8981\u591a\u591a\u79ef\u7d2f\u3002<\/p>\n<p>\u4ee5\u5199\u4f5c\u4e3a\u5951\u673a\uff0c\u903c\u8feb\u81ea\u5df1\u5b66\u6df1\u5165\u81ea\u5df1\u672a\u66fe\u6df1\u5165\u7684\u9886\u57df\uff0c\u662f\u975e\u5e38\u9ad8\u6548\u7684\u4e00\u79cd\u5b66\u4e60\u65b9\u6cd5\uff0c\u63a8\u8350\u7ed9\u5927\u5bb6\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\u3002<\/p>\n<p>\u5982\u679c\u4f60\u89c9\u5f97\u672c\u6587\u7684\u5185\u5bb9\u5bf9\u4f60\u7684\u5b66\u4e60\u5f88\u6709\u5e2e\u52a9\uff0c\u55ef\u2026\u2026\u4e70\u672c\u300aCSS\u65b0\u4e16\u754c\u300b\u652f\u6301\u4e0b\u5427\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201608\/doge.gif\" width=\"22\" height=\"22\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u6b22\u8fce\u5206\u4eab\uff0c\u52ff\u5168\u6587\u8f6c\u8f7d\uff0c\u5982\u679c\u5b9e\u5728\u559c\u6b22\uff0c\u53ef\u6536\u85cf\uff0c\u6c38\u4e0d\u8fc7\u671f\uff0c\u4e14\u4f1a\u53ca\u65f6\u66f4\u65b0\u77e5\u8bc6\u70b9\u53ca\u4fee\u6b63\u9519\u8bef\uff0c\u9605\u8bfb\u4f53\u9a8c\u4e5f\u66f4\u597d\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10815\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10815<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/to-video-cover.png\" width=\"160\" height=\"100\" alt=\"\u89c6\u9891\u5408\u6210\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" \/><\/p>\n<p>\u672c\u6587\u7b97\u662f\u76ee\u524d\u56fd\u5185\u5173\u4e8e\u6d4f\u89c8\u5668\u97f3\u89c6\u9891\u5408\u6210\uff0c\u5c24\u5176WebCodecs API\u8fdb\u884c\u89c6\u9891\u5408\u6210\u8fd9\u5757\u6bd4\u8f83\u7a00\u7f3a\u7684\u5185\u5bb9\u4e86\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[180],"tags":[489,1921,1918,53,1738,1387,1919,1920,1917,218,236,1740,1750],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/10815"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=10815"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/10815\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=10815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=10815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=10815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}