progressive download

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progressive download

A method for streaming non-live video to the user for immediate playback. Supported in the user's media player, progressive download employs HTTP, the protocol used to download everything from the Web. Unlike a regular download, progressive download lets users view the video as soon as a small amount of content has been received. The video is stored in a temporary folder and can be played again within the same user session but cannot be saved unless the media player offers that option. See HTTP.

A huge number of websites favor progressive downloads, including YouTube. These sites use free, open source Web server software, rather than proprietary streaming servers, such as Windows Media Services and Flash Media Server.

As long as the video describes its content structure in the front of the file (see metadata), modern content delivery networks (CDNs) enable fast forwarding into the middle of the video without downloading the preceding content.

Progressive Download Vs. Real-Time Streaming
Although most users cannot tell the difference, progressive download stores the entire file, while "real-time streaming," sometimes called "true streaming," is analogous to broadcast radio and TV. Although there are always more video frames in the memory buffer at each moment, real-time streaming content essentially passes through the computer.

In addition, real-time streaming uses the UDP protocol, which may ignore lost packets and accept packets with errors. Progressive download uses TCP to ensure that each network packet arrives intact and will request retransmission if not. This can temporarily stop the video when only a momentary blip in viewing might have been observed. See streaming video and TCP/IP.

Filling the Buffer
The message means 70% of a reserved area in memory is filled. When it reaches 100%, the software (Windows Media Player in this example) will start "playing" the video.
References in periodicals archive ?
Even if you disable the save-as function on your progressive download QuickTime, the whole clip is still downloaded to the viewer's computer, allowing the audience to extract the video file from their Internet cache (depending on which Internet browser they use).
The whole infrastructure behind the progressive download is completely separate from the broadcast element and, therefore, requires a completely new headend," explains Patel.
Progressive download is one of the easier features to support.
264, as well as any of the other formats they already supported for progressive download.
Using NDS set-top box software and end-to-end progressive download technology to power its on demand service, Sky is able to deliver VOD content over Sky's own broadband network direct to the customer's set-top box.
There is no caching, no progressive download, and any interruptions between the origin and destination of a live stream will be noticeable to the viewer.
To help with extending battery life, the free GoFlex Media[TM] app provides a progressive download feature, which temporarily loads the video on to the iOS device it is being streamed to, allowing the drive to go into stand-by mode.
We are no longer required to build separate mechanisms to handle all the permutations of HTTP and non-HTTP streaming technologies, as well as progressive download, pseudo-streaming, and many other formats.
AuthenTec's solution works seamlessly in Android- and iOS-based devices with minimal to no action required from end users and supports file based PlayReady protection including progressive download as well as streaming media including PlayReady protected adaptive video streaming both with Smooth Streaming and HTTP Live Streaming.
Of course, as it turns out, it's been a combination of streaming and progressive download in the form of adaptive bitrate delivery that's won out, at least when it comes to online video content that can be played on multiple devices.
By combining their solutions, SoftAtHome and Vestel ported all the features usually available on an IPTV STB directly on to a Connected TV including Live IPTV, PVR, Time Shifting, VoD, progressive download, premium content delivery and content sharing.
Stereo audio dominated over mono, as you can see, as did progressive download over RTMP.

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