2019年6月11日
By 1月时特约编辑
专题文章

如何用便携式编码器流到Facebook直播

In this tutorial, you’ll learn how to stream an event to Facebook Live using the LiveU独奏编码器. 尽管本教程是针对产品和服务的, I’ll do what I can to generalize operation for other services and for other 编码器s.

选择编码器

Portable 编码器s input the HDMI or HD-SDI feed from your camcorder or live mixer, 将其编码为可管理的带宽, 然后将其传输到目标流媒体服务, or a proprietary cloud service that will route it to your target. 例如, 独奏, 你可以流到LiveU的Solo云服务, 将流重定向到Facebook.

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有许多编码器选项, from cigarette-pack-sized 编码器s that attach via your camera’s cold shoe to the deli-sandwich-sized LiveU独奏 (图1)，你可以把它挂在三脚架或皮带上. 大多数编码器支持无线网络和/或以太网, 哪一个 is convenient when broadcasting events from locations with these signals. 接入3G/4G, you’ll need an 编码器 that comes with either dedicated internal modem slots or USB slots for third-party modems.

图1. The LiveU独奏 fits comfortably in your hand and can hang on a belt or tripod.

The LiveU独奏 has two USB slots, allowing two connections to one or two different 4G services. 我们有Verizon和T-Mobile的调制解调器. Using two services is nice because it provides a measure of signal redundancy, 如果两个信号都是活的, 调制解调器可以在两者之间传输数据, 提高出站信号带宽和视频质量. 如果你所在的地方有以太网和无线网络, Solo也可以使用这些信号, 启用绑定, 高带宽信号，确保高视频质量.

Solo云服务

像大多数大型编码器公司一样, LiveU提供云服务, 或门户, 用于连接到不同的直播服务. 幕后故事, job number one for the service is to reassemble the bits transmitted over the different internet connections into a cohesive stream to be routed to the target streaming service. 明显的好处是你可以把两个4G信号结合起来, 无线网络, and Ethernet from the modem into a high-bandwidth stream delivered to your service of choice.

在操作上，Solo在5左右达到峰值.5Mbps，它将从可用信号中平均分配. Pushing the signal through the cloud adds about 5 seconds of latency, 哪一个 you can halve via a low-latency mode that LiveU makes available in the broadcast interface. This reduces forward error correction, however, 哪一个 may reduce video quality. 除非延迟是一个问题，否则我会在正常模式下广播.

对于像Facebook这样的大多数服务来说, you’ll use a preset that automatically routes the signal through the cloud service. Note that you can configure the generic RTMP preset to disable bonding and transport directly to Facebook (or any service), 把云从画面中去掉, but this limits your transport to a single connection since Facebook can’t reassemble packets from disparate connections. 如果延迟是一个问题, 而且你的以太网连接很稳定, this might be worthwhile; but if you’re transmitting via 4G with two modems, you’ll definitely want to transport over both signals and aggregate the bandwidth.

是通过特定服务还是通用预设进行传输, 您将首先通过云服务设置您的事件. You can start and stop the 编码器 remotely via the cloud service, 所以如果你派个摄像师跟小组一起去, 他或她所要做的就是打开Solo, 连接到互联网, and plug in the camera; you can do the rest from the comfort of your office or studio. If you’re working solo without on-site connectivity for your computer, 你可以在办公室举办活动, 现场手动启动Solo硬件, 它将广播到最后配置的事件. Or, you can set up the event and control operation via a smartphone or tablet with connectivity.

设置硬件

Solo的硬件尺寸大约是5 x 4 x 2英寸. Our unit has both HDMI and HD-SDI input connectors and costs $1,495; you can also buy an HDMI-only unit for $995. 输入连接器在右侧, 还有一个耳机插孔, 当前未使用的microSD插槽, 和一个USB接口. On the left is the AC power connection, Ethernet port, and the other USB port. The Solo has an internal battery that should enable up to 2 hours of broadcasting.

On the front is a small color LCD panel you’ll use to configure the system and also as a confidence monitor to preview the video during the event, 当远程广播时，这总是好的. You configure and control the unit via a joystick and the On/Off switch for powering the unit up and starting and stopping the stream, 哪一个, 正如前面提到的, 你也可以通过云服务来做.

The LCD panel uses color coding to designate connection status (图2). If the bars for the service are yellow, the service is not transmitting. 绿色表示业务已连通. 我住在一个乡村地区，Verizon的服务很好, 但没有T-Mobile发射塔, 所以对我来说, Verizon是绿色的，T-Mobile是黄色的. 注意图中, 我调亮了图像，以便更好地显示黑色的开/关按钮, 哪一个 lightened the green bars on the Verizon service to almost yellow, T-Mobile连接的黄色条接近白色. The Solo display shows them as more clearly green and yellow in person, 你可以毫不费力地将它们区分开来.

图2. The Verizon signal (in green) was working, T-Mobile (in yellow) wasn’t. Note the joystick control beside the LCD panel and the On/Off switch below.

设置软件

如前所述，您通过其门户(图3)，它可以控制多个单人单位. 买了Solo之后, 您向门户注册, 把硬件连接到互联网上, 然后在云服务中输入设备的序列号, 是什么把硬件和你的账户连接起来的. 基本门户是免费的, and there’s a graphics package you can use to add graphics to your videos with pricing starting at $75/month for up to 10 hours of graphics.