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* Broadcast TV uses some of the available RF spectrum to broadcast video signals as far as they will go. This used to be completely analog transmissions, but more recently digital transmissions started beeing used. This is a heavily regulated distribution channel, you cannot simply set up your own.
== Video on the Web ==
A few years ago it became possible to put videos on the web by using a Flash container, which worked great because almost everyone had a recent version of the flash plugin installed.
More recently with development of HTML5 it became possible to embed non-flash videos on webpages using the <video> tag. Unfortunately that specification does not mandate use of a particular container and codec, so support for the tag varies with different browsers.
= Links =
* http://en.wikipedia.org/wiki/Comparison_of_container_formats
* http://en.wikipedia.org/wiki/Container_format_%28digital%29
* http://en.wikipedia.org/wiki/Flash_video
* http://en.wikipedia.org/wiki/HTML5_video