使用 Node.js 将视频文件流式传输到 html5 视频播放器，以便视频控件继续工作? [英] Streaming a video file to an html5 video player with Node.js so that the video controls continue to work?
问题描述
使用 Node.js 将视频文件流式传输到 html5 视频播放器以便视频控件继续工作的正确方法是什么?
我认为这与处理标题的方式有关.无论如何，这是背景信息.该代码有点冗长，但非常简单.
I think it has to do with the way that the headers are handled. Anyway, here's the background information. The code is a little lengthy, however, it's pretty straightforward.
我学会了如何轻松地将小视频文件流式传输到 HTML5 视频播放器. 使用此设置，控件无需我的任何操作即可工作，并且视频流完美无瑕.带有示例视频的完整代码的工作副本在 这里，对于在 Google 文档上下载.
I learned how to stream small video files to an HTML5 video player very easily. With this setup, the controls work without any work on my part, and the video streams flawlessly. A working copy of the fully working code with sample video is here, for download on Google Docs.
客户:
<html>
<title>Welcome</title>
<body>
<video controls>
<source src="movie.mp4" type="video/mp4"/>
<source src="movie.webm" type="video/webm"/>
<source src="movie.ogg" type="video/ogg"/>
<!-- fallback -->
Your browser does not support the <code>video</code> element.
</video>
</body>
</html>
服务器:
// Declare Vars & Read Files
var fs = require('fs'),
http = require('http'),
url = require('url'),
path = require('path');
var movie_webm, movie_mp4, movie_ogg;
// ... [snip] ... (Read index page)
fs.readFile(path.resolve(__dirname,"movie.mp4"), function (err, data) {
if (err) {
throw err;
}
movie_mp4 = data;
});
// ... [snip] ... (Read two other formats for the video)
// Serve & Stream Video
http.createServer(function (req, res) {
// ... [snip] ... (Serve client files)
var total;
if (reqResource == "/movie.mp4") {
total = movie_mp4.length;
}
// ... [snip] ... handle two other formats for the video
var range = req.headers.range;
var positions = range.replace(/bytes=/, "").split("-");
var start = parseInt(positions[0], 10);
var end = positions[1] ? parseInt(positions[1], 10) : total - 1;
var chunksize = (end - start) + 1;
if (reqResource == "/movie.mp4") {
res.writeHead(206, {
"Content-Range": "bytes " + start + "-" + end + "/" + total,
"Accept-Ranges": "bytes",
"Content-Length": chunksize,
"Content-Type": "video/mp4"
});
res.end(movie_mp4.slice(start, end + 1), "binary");
}
// ... [snip] ... handle two other formats for the video
}).listen(8888);
但是这种方法仅限于文件
1GB 大小.
But this method is limited to files < 1GB in size.
通过使用fs.createReadStream()，服务器可以在流中读取文件，而不是一次将其全部读入内存.这听起来是正确的做事方式，而且语法极其简单:
By utilizing fs.createReadStream(), the server can read the file in a stream rather than reading it all into memory at once. This sounds like the right way to do things, and the syntax is extremely simple:
服务器代码段:
movieStream = fs.createReadStream(pathToFile);
movieStream.on('open', function () {
res.writeHead(206, {
"Content-Range": "bytes " + start + "-" + end + "/" + total,
"Accept-Ranges": "bytes",
"Content-Length": chunksize,
"Content-Type": "video/mp4"
});
// This just pipes the read stream to the response object (which goes
//to the client)
movieStream.pipe(res);
});
movieStream.on('error', function (err) {
res.end(err);
});
这可以很好地流式传输视频！但视频控件不再起作用.
This streams the video just fine! But the video controls no longer work.
推荐答案
Accept Ranges 标头(writeHead() 中的位)是 HTML5 视频控件所必需的上班.
The Accept Ranges header (the bit in writeHead()) is required for the HTML5 video controls to work.
我认为不是盲目地发送完整文件，您应该首先检查 REQUEST 中的 Accept Ranges 标头，然后读入并发送该位.fs.createReadStream 支持 start 和 end 选项.
I think instead of just blindly send the full file, you should first check the Accept Ranges header in the REQUEST, then read in and send just that bit. fs.createReadStream support start, and end option for that.
所以我尝试了一个例子并且它有效.代码并不漂亮，但很容易理解.首先我们处理范围标题以获得开始/结束位置.然后我们使用 fs.stat 来获取文件的大小，而无需将整个文件读入内存.最后，使用 fs.createReadStream 将请求的部分发送给客户端.
So I tried an example and it works. The code is not pretty but it is easy to understand. First we process the range header to get the start/end position. Then we use fs.stat to get the size of the file without reading the whole file into memory. Finally, use fs.createReadStream to send the requested part to the client.
var fs = require("fs"),
http = require("http"),
url = require("url"),
path = require("path");
http.createServer(function (req, res) {
if (req.url != "/movie.mp4") {
res.writeHead(200, { "Content-Type": "text/html" });
res.end('<video src="http://localhost:8888/movie.mp4" controls></video>');
} else {
var file = path.resolve(__dirname,"movie.mp4");
fs.stat(file, function(err, stats) {
if (err) {
if (err.code === 'ENOENT') {
// 404 Error if file not found
return res.sendStatus(404);
}
res.end(err);
}
var range = req.headers.range;
if (!range) {
// 416 Wrong range
return res.sendStatus(416);
}
var positions = range.replace(/bytes=/, "").split("-");
var start = parseInt(positions[0], 10);
var total = stats.size;
var end = positions[1] ? parseInt(positions[1], 10) : total - 1;
var chunksize = (end - start) + 1;
res.writeHead(206, {
"Content-Range": "bytes " + start + "-" + end + "/" + total,
"Accept-Ranges": "bytes",
"Content-Length": chunksize,
"Content-Type": "video/mp4"
});
var stream = fs.createReadStream(file, { start: start, end: end })
.on("open", function() {
stream.pipe(res);
}).on("error", function(err) {
res.end(err);
});
});
}
}).listen(8888);
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