The denizens of Hollywood and Silicon Valley have, by and large, vastly different value systems, role models, even tastes in cars, food and clothing.

But they increasingly agree on one thing: a standard for online video called Adobe Flash.

Flash was once known primarily as the technology behind those niggling Web ads in the 1990s that gyrated and flickered on the screen. Today, it is a ubiquitous but behind-the-scenes Web format used to display Facebook applications, interactive ads and, most notably, the video on sites like YouTube and Hulu.com.

Now Adobe Systems, which owns the technology and sells the tools to create and distribute it, wants to extend Flash’s reach even further. On Monday, Adobe’s chief executive, Shantanu Narayen, will announce at the annual National Association of Broadcasters convention in Las Vegas that Adobe is extending Flash to the television screen. He expects TVs and set-top boxes that support the Flash format to start selling later this year.

For consumers, what sounds like a bit of inconsequential Internet plumbing actually means that a long overhyped notion is a step closer to reality: viewing a video clip or Internet application on a TV or mobile phone.