Flash大师

有一个Flash视频问题? Let 斯特凡•里希特, the Flash guru, help you out. In this monthly series, Richter will answer Flash questions sent in by StreamingMedia.Com阅读器或来自流媒体论坛.

斯特凡•里希特
里希特是 Muchosmedia, a UK-based software firm specializing in rich Internet applications. The company works for an international client base that includes ITV, 联合利华, 泰特现代美术馆, 最近推出了它的第一款产品, Scribblar, an online collaboration tool which is proving popular in the eLearning community. Richter also maintains his personal blog, the popular FlashComGuru.

Stefan's first question this month was e-mailed from Anders:

Do you know if the Flash player supports the new Apple HTTP流媒体 protocol? 或者Adobe是否有计划支持它?

如果以上都不是, do you know if someone has made a Flash playerplug-in for the HTTP Streaming protocol?

I think the HTTP Streaming protocol looks very promising. 你认为有哪些缺点?

很好的问题. 斯特凡对Adobe的计划并不熟悉, but did some digging 和 turned up this is the company's release notes for Flash Player 10.1:

HTTP流媒体
HTTP流媒体 enables delivery of video-on-dem和和 live streaming using st和ard HTTP servers, 或从cdn的HTTP服务器, leveraging st和ard HTTP infrastructure 和 SWF-level playback components. The addition of HTTP流媒体 will enable exp和ed protocol options to deliver live 和 recorded media to Flash Player, including full content protection for HTTP streamed video with Flash Access 2.0.

It's not much, but it does sound like Adobe plans to implement it sometime in the near future. 这里有一个 article on the same subject from Contentinople, also saying that it's coming.

Until that time, however, no, there's no plug-in that would work. "The only thing you can do now is HTTP progressive downloading," 斯蒂芬说. This is a pseudo-streaming solution that uses PHP to deliver video over HTTP. "It's a bit like streaming," he says, in that it lets you jump to any point in a video at any time. To the end-user, it looks just like an HTTP stream. 这是一个列斯特凡写的关于这个话题的文章.

Stefan isn't aware of any major drawbacks to HTTP流媒体, but he suggests it may be harder to secure the delivery of content. 好处是很明显的, as it offers the characteristics of streaming with the advantage of HTTP delivery.

Stefan's second question was e-mailed from Dan:

Is there a way to get Skype video on Flash Media Live Encoder 3? We're looking at doing remote live video from the team while they're on the road, 而使用Skype似乎是最简单的. 你的想法?

There's no plug-和-play solution to do what you ask, 斯蒂芬说, but he can imagine a workaround to take care of it. Anything you want to broadcast with FMLE has to show up as a video source. You need something to bridge the gap between FMLE 和 Skype, 和, 而斯特凡还没试过, 他想象Camtasia可能会起作用. Use Camtasia's live mode to make a live screen recording of the Skype video. That should give you the video source you need for FMLE. "It sounds like a bit of a hack to me, but it might work," 斯蒂芬说.

斯特凡的第三个问题是 posted to a 流媒体 forum by "abouldin":

We are looking into building a Flash server that will provide live 和 on-dem和 streaming. How complicated is this going to be 和 what are the pluses 和 minuses on doing such an endeavor? This server will be just for small traffic. If we have the need for large capacity, I will use a CDN.

This is pretty straightforward, 斯蒂芬说, 和 not all that complicated. On a Windows computer you can use any Windows operating system, although he recommends Windows Server 2008. 购买Flash Media Server的副本, 如果你想用这个的话, 然后完成安装步骤. You won't need any detailed knowledge, 和 you can go with the default settings. 一旦你安装了它, the one tricky thing is that you need to allow the server to talk to the outside world through the computer's firewall. The Windows firewall will block your connection, so you need to go into the firewall settings 和 tell it to allow the program. The FMS installation directory has three files that you need to add: fmsedge, fmscore, 和 fmsmaster. 启用所有这三个. Once you're done, your server will be able to reach the outside world.

If you're more comfortable with Linux or Java, you can look at the Wowza Media Server or Red5. That last is an open source alternative to FMS, 和斯蒂芬说 it's the most challenging to set up.

提交您的Flash视频问题到流媒体’s Formats, Codecs, 和 Players forum，或直接寄给作者 tdreier@nkgx.net