They’re listed here in order of increasing sophistication: Techniques for delivering video vary quite a bit in the amount of control the player has over playback. Live streams can also be recorded for later access as VOD. In contrast to VOD, with live streaming the content provider determines when users view the video (as with broadcast television). Pay-per-view sporting events are examples of live streaming. In this case, the media server delivers content as it is generated in real time (or with only a slight delay). Live streaming is another increasingly popular use of media-streaming servers. As discussed further below, there are several techniques for VOD, and a media server needs to support some or all of them depending on the kinds of video players it supports. But perhaps the most common use case for VOD is subscription services like Netflix, Amazon, and Hulu, where media servers located all over the world deliver video to millions of customers from content delivery networks (CDNs). In the simplest case, the video file is embedded in a web page and stored on the same host as the other components of the page. The most common use of media servers is probably to deliver video on demand (VOD), in which the media server retrieves prerecorded video content from storage and delivers it across the Internet. The term is used to refer both to a software application that performs this function and a host that’s running the media server software. A media server delivers video and audio content to clients who request it.
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