Webcasting for the Masses

This article 第一个 appeared in the December 2009/January 2010 issue of 流媒体 杂志. 点击 在这里 for your free subscription.

Webcasting live events used to be complicated and expensive, but a range of products and services—some new, others that have been around for a while—have simplified live event streaming and made it much more affordable. 在本文中, I’ll identify the relevant live marketplaces and outline key companies and technologies to consider in each market.

Let me say up front that this is a fast-moving market with lots of service providers moving in and out alongside long-established players. I tried to mention the most prominent companies in each space along with some decision-making criteria for your consideration. 然而, my company listings are by no means exhaustive, and if I mention that a particular product or service has a certain feature, it does not mean that other products or service providers don’t offer the same feature.

概述
After starting my research, I quickly discovered that the live event market is actually composed of (at least) two submarkets: rich media communications, which involves streaming PowerPoint slides and other graphics with the video, 以及视频活动.

(Note that this article does not address services such as WebEx, ON24, BrightTalk, and others that combine audio-only streaming with slide presentations, nor does it examine the technology choices associated with a "roll your own" approach to webcasting.)

While t在这里’s some crossover between the two markets, the decision tree is very different. 具体地说, with rich media communications you almost never want to piece together the system yourself; it’s simply too complicated. Rather, you choose a system from a vendor such as Accordent Technologies, 公司. 或Sonic Foundry, 公司. 第一个, and this decision largely directs your ancillary decisions, 比如玩家, 传输协议, and distribution technique.

In live video-only streaming, the decision tree 第一个 works through the target of your webcast—internal or external— particularly if LANs and WANs within your organization are multicast-enabled. If so, your best option is to use internal multicast-compatible servers, not an external service. Since my focus is primarily external broadcasts, I won’t address multicast distribution any further.

If you’re targeting an external audience and/or your internal WAN structure is not reliably multicast-compatible, you can adapt an a la carte approach, choosing your player (Flash, Silverlight, Windows媒体, iPhone), 传输协议, RTSP, RTMP), 编码器(或多个编码器), and distribution partner separately. 然而, a better approach for most organizations would be choosing a live streaming service provider (LSSP) such as Livestream; Multicast Media Technologies, 公司.; or Ustream.tv. 在过去的几年里, companies in this category have started working with an impressive list of client companies and brands. 例如, Multicast claims Delta Air Lines, SAP, and Sotheby’s as clients; Livestream mentions IBM, 《百家乐软件app最新版下载》, and C-SPAN on its website; and Ustream.tv serves Disney, Duke University, and Sun Microsystems, 公司. 如果这些很大, tech-savvy organizations think it’s best to hire out this functionality, perhaps it’s right for your organization as well.