blocks|key|559234|text|我不认为当涉及到使用网络摄像头时，Node.js有任何特定的东西，无论你使用什么语言或服务器，概念通常都是相同的。所涉及的硬件和该硬件的接口应该是您的解决方案的定义。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|559235|最简单的情况是提供单个快照，这些快照由摄像头附带的软件定期保存到磁盘，或者您可以创建调用local+process或program的a+system+call来按需保存快照。然后，您可以使用定期刷新最新快照的Node.js来提供页面。|offset|length|559236|或者，您也可以使用为操作系统量身定做的控制器(DirectShow、Windows+Image+Acquisition和live+video+stream+)直接与网络摄像头硬件连接，并使用Node.js作为传输机制来创建一个摄像头。|559237|如果你的摄像头有一个网络接口，并且已经提供了一个流媒体服务器，你可能想要研究一个反向代理解决方案，例如使用nginx或Apache。Here+is+a+solution，其中nginx用于代理由VLC格式化的网络摄像头流。|559238|Here+is+a+creative+solution+that+captures+a+video+stream+by+taking+individual+frames,+encoding+the+image+data,+and+using+websockets+to+push+the+image+data+to+a+canvas+element+on+a+client+page，使用Node.js作为中间服务器。|559239|entityMap|0|LINK|mutability|MUTABLE|url|http://tldp.org/HOWTO/html_single/Webcam-HOWTO/#COMMAND|1|http://batchloaf.wordpress.com/commandcam/|2|http://nodejs.org/docs/latest/api/child_process.html#child_process_child_process_exec_command_options_callback|3|http://msdn.microsoft.com/en-us/library/windows/desktop/dd375454(v=vs.85).aspx)|4|http://msdn.microsoft.com/en-us/library/ms630368(VS.85%2529.aspx),%2520[IKPictureTaker](https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/IKImagePicker_Class/IKImagePicker_Reference.html),%2520[V4L2](http://v4l2spec.bytesex.org/spec/),%2520etc.|5|http://en.wikipedia.org/wiki/HTTP_Live_Streaming|6|http://www.kutukupret.com/2011/04/15/nginx-vlc-streaming-cheap-webcam/|7|http://francisshanahan.com/index.php/2011/stream-a-webcam-using-javascript-nodejs-android-opera-mobile-web-sockets-and-html5/^0|0|18|D|0|1M|7|1|1U|D|2|0|N|A|3|Y|P|4|1O|H|5|0|1U|I|6|0|0|5B|7|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]|$D|1C|E|1D|1|1E]|$D|1F|E|1G|1|1H]]|A|$]]|$1|F|3|G|5|6|7|1I|8|@]|9|@$D|1J|E|1K|1|1L]|$D|1M|E|1N|1|1O]|$D|1P|E|1Q|1|1R]]|A|$]]|$1|H|3|I|5|6|7|1S|8|@]|9|@$D|1T|E|1U|1|1V]]|A|$]]|$1|J|3|K|5|6|7|1W|8|@]|9|@$D|1X|E|1Y|1|1Z]]|A|$]]|$1|L|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]|V|$5|O|P|Q|A|$R|W]]|X|$5|O|P|Q|A|$R|Y]]|Z|$5|O|P|Q|A|$R|10]]|11|$5|O|P|Q|A|$R|12]]|13|$5|O|P|Q|A|$R|14]]|15|$5|O|P|Q|A|$R|16]]]]

I don't think there's anything specific to Node.js when it comes to working with webcams, the concepts are generally the same no matter what language or server you're using. The hardware involved and the interfaces to that hardware is what should define your solution.

The simplest case would be to serve individual snapshots that are periodically saved to disk by the webcam's included software, or you can make <a href="http://nodejs.org/docs/latest/api/child_process.html#child_process_child_process_exec_command_options_callback" rel="noreferrer">a system call</a> that invokes a <a href="http://tldp.org/HOWTO/html_single/Webcam-HOWTO/#COMMAND" rel="noreferrer">local process</a> or <a href="http://batchloaf.wordpress.com/commandcam/" rel="noreferrer">program</a> to save a snapshot on demand. You can then serve a page using Node.js that periodically refreshes the latest snapshot.

Alternatively, you can interface directly with the webcam hardware using a controller tailored to the operating system (<a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd375454(v=vs.85).aspx" rel="noreferrer">DirectShow</a>, <a href="http://msdn.microsoft.com/en-us/library/ms630368(VS.85).aspx" rel="noreferrer">Windows Image Acquisition</a>, <a href="https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/IKImagePicker_Class/IKImagePicker_Reference.html" rel="noreferrer">IKPictureTaker</a>, <a href="http://v4l2spec.bytesex.org/spec/" rel="noreferrer">V4L2</a>, etc.) and create a <a href="http://en.wikipedia.org/wiki/HTTP_Live_Streaming" rel="noreferrer">live video stream</a> using Node.js as the transport mechanism.

If your webcam has a network interface and already offers a streaming server, you might want to look into a reverse proxy solution instead, using nginx or Apache for example. <a href="http://www.kutukupret.com/2011/04/15/nginx-vlc-streaming-cheap-webcam/" rel="noreferrer">Here is a solution</a> where nginx is being used to proxy a webcam stream formatted by VLC.

<a href="http://francisshanahan.com/index.php/2011/stream-a-webcam-using-javascript-nodejs-android-opera-mobile-web-sockets-and-html5/" rel="noreferrer">Here is a creative solution that captures a video stream by taking individual frames, encoding the image data, and using websockets to push the image data to a canvas element on a client page</a>, using Node.js as the intermediate server.

blocks|key|559264|text|也可以使用node.js库node-webcam|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|559265|Webcam.capture(+"test_picture",+function(+err,+data+)+{}+);|code-block|syntax|javascript|559266|但我认为它是fswebcam的简单包装器。|559267|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/node-webcam^0|D|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

It is also possible to use node.js library <a href="https://www.npmjs.com/package/node-webcam" rel="nofollow noreferrer">node-webcam</a>

<pre><code>Webcam.capture( "test_picture", function( err, data ) {} );
</code></pre>

But I suppose it is simple wrapper of fswebcam.

blocks|key|559337|text|我正在开发我自己的基于puppeteer+(chrome+headless+browser)的库，所以它是100%25便携的，并且可以接受(在我的机器中，视频大小为480x320，每秒40fps)：https://www.npmjs.com/package/camera-capture。有不同的方式使用视频流和命令行API。非常新的项目，所以反馈是非常欢迎的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|559338|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/camera-capture^0|2P|18|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I'm working on my own library based on puppeteer (chrome headless browser) and so is 100% portable and works acceptably fine (40fps in my machine for video size 480x320) : <a href="https://www.npmjs.com/package/camera-capture" rel="nofollow noreferrer">https://www.npmjs.com/package/camera-capture</a>. Has different ways of consuming the video stream and a command line API too. Very new project so feedback is very welcome.

Does anyone have any experience with trying to access a webcam through node? I can't seem to find any prior attempts at this.

To expand a bit - I have a nodeJS server running, and I want to be able to access the webcam on the same box Node is running (so really, I'm using node more as a client implementation). Some things I wanted to do - get an image from the webcam, or, it'd be awesome if I could get a stream to the webcam that I pipe to another server and stream to other clients ;)

Does anyone know how this can be done?

Thanks

Accessing WebCam with NodeJS

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有没有通过node访问摄像头的经验？我似乎找不到任何以前的尝试。扩展一点--我有一个nodeJS服务器在运行，我希望能够访问Node正在运行的同一个机器上的摄像头(所以实际上，我使用node more作为客户端实现)。我想做的一些事情--从网络摄像头获取图像，或者，如果我可以将一个流传输到网络摄像头，然后通过管道传输到...

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