Time Warner (NYSE: TWX) movie network HBO will begin testing an online video service. The new project would allow network subscribers to watch programming on their PCs or download them to watch later. According to The Wall Street Journal, "HBO is starting a trial of the service, called HBO Broadband, in Green Bay, Wis., the network says, and could roll it out more widely later this year."

While HBO's brand is well-known among cable subscribers, it is difficult to predict whether this will translate into a large audience online. The amount of premium content available over the internet is growing rapidly as companies like Netflix (NASDAQ: NFLX), Amazon (NASDAQ: AMZN), and Apple (NASDAQ: AAPL) enter the industry. In a field this crowded, newer competitors may have trouble finding audiences.

HBO does have one distinct advantage. Many of the programs on the network are produced for its viewers and are not available elsewhere. This large amount of original content may draw a substantial audience for the new distribution channel.

But the field is getting crowded.

Douglas A. McIntyre is an editor at 247wallst.com.