Video: The Case for Satellite Streaming Over IP for Large-Scale Live Events
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Read the complete transcript of this clip:
凯西•布: There are two main workflows that we use with satellite. One is taking a feed over a Ku satellite. Book a transponder, and you get the truck out there. And this is sort of the traditional broadcast workflow.
克里斯·诺尔顿: So this is where you have a truck that comes with a dish that folds up and starts beaming into the sky?
凯西•布: 是的. And you know transponder time is something like $600/hour for a slot on a transponder that will get you roughly 17 megabits up.
克里斯·诺尔顿: So that's basically buying a time slice on the satellite when you say that, right?
凯西•布: 完全. And then you have to downlink that to a facility, and there are many different facilities. We have gear placed at one of these downlink facilities. So we just call up or send an email to traffic control. Tell them the satellite coordinates and the time. 他们预订了. And then the signal magically appears in my encoder the day of the event.
这是一个很好的工作流程, because if the budget allows you have a really reserved connection and you can get these pretty much anywhere in the world. 有全球卫星覆盖.
克里斯·诺尔顿: So, basically, you bought the bandwidth, so you don't have to worry about any congestion. How many other cellular users are in the area? 所有这些问题都消失了吗?
凯西•布: 这是正确的. And this is sort of borrowing from the traditional broadcast infrastructure and twisting it to use it for our live streaming purposes. 但有一种更现代的方法, and we actually started using this before we started doing Ku stuff, 这就是结果吗. 这是利用数据卫星. So there are companies like Viasat that run the Exede broadband service, and some of you may know this from residential broadband, if you live out in the boonies you can still get broadband internet. You set up this little 90 centimeter dish, 看起来像个DirectTV碟子, and you get about 12-18 Megabits down and 5-8 up. So it’s definitely enough to do an HD stream.
Without really getting into their business model, I'll just talk about the workflow. So we can put an IP encoder on site. Set up this little dish, it takes about 10 minutes to point it if you practice with it. And you can get upstream bandwidth for a live stream, practically anywhere. 这是没有保留的. 这不是KU的事. The traffic will be prioritized because of their service packaging. But it is, and it is a shared medium.
But they do have a good bit of capacity and they launched a second satellite, 哪一个会启动并运行, 我认为, 在春天. So there is considerable amount of this satellite IP available. It's describing the spectrum that the satellite uses, it's KA band as opposed to KU. And that's kinda neat because it's a straight IP workflow. Once you go into an encoder it never touches baseband video again.
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