Behind the Scenes: How to Produce a Live-Switched Webcast
Go behind the scenes at 流媒体 East 2013's 4-track, 为期3天, live-switched conference and 1-day webcast with producer and crew chief 肖恩林 and see the process and the gear and how it all fits together in live-switched webcast production.
At 流媒体 East 2013 in New York last week, I assembled a crew to shoot and switch and record all four conference tracks, plus the 2-track Content Delivery Summit that took place the day before the 流媒体 East program began. 周二, 演出的第一天, we also live-switched and live-streamed the keynotes and the entire day’s sessions from the keynote room. 图1(下面) shows me working here behind the video production table in the keynote room, one of the four that we're taking care of.
图1. 肖恩林 switching and producing video at 流媒体 East 2013.
HD Video Switcher: The Roland V40 HD
At the center of our production workflow was the new Roland V40 HD video switcher (下面的图2). It's an entry-level professional video switcher that has HDMI inputs. We used it with two video cameras that are connected via HDMI. We also connecting a VGA input, coming from the presenter's laptop.
图2. 罗兰V40高清切换器.
One of the nice features of this video switcher is the fact you can mix both high-definition HDMI video as well as analog VGA. A lot of video switchers lack that capability, 不幸的是, much of the AV presentation world is still stuck on the VGA standard, so having the ability to put VGA inputs on an HDMI video switcher is excellent. It also has built-in video 定标器s on each input, which is advantageous because the VGA signal often isn't the same size, so I do have the ability in the menu to scale the signal up to fill the frame if it's a bit undersized as well.
图3(下面) 显示多视图监视器. It's coming straight out of the V40 HD video switcher, and it's an HDMI output. It allows me to see the live feed--the program feed--as well as the preview and any additional inputs that are available to me. I can change the live camera by pressing the A-bus program line, 我可以换乘b路车, which is the next video feed on deck. And, then using the T-bar, I can also cut between them.
图3. V40高清多视图监视器.
The signal from the V40 HD feeds out into a variety of different things, but the most important for the live webcast is the Teradek Cube (下面的图4)，它接受HD-SDI输入. In our setup at 流媒体 East we had an Ether网 Inter网 input coming in, and we live-streamed it to Ustream.
图4. Teradek立方体
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