How does a youtube embed suppress the buffering of a video file?

Posted by usingtechnology on Stack Overflow See other posts from Stack Overflow or by usingtechnology
Published on 2009-06-11T15:37:17Z Indexed on 2010/05/28 12:01 UTC
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flash

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swf

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youtube

When a youtube video is displayed within an external site, a poster image is displayed but the actual video is not loaded until the user clicks the play button. At that point, the video file begins to buffer and the video plays.

This seems to be different than many sites, where a flash video is embedded and the video begins to buffer automatically in the background on page load, regardless of whether the video is set to autoplay or not.

How would you set up a flash video (non-youtube) to have the same behavior as youtube, where buffering does not occur at pageload? Is it an output setting that is selected during the flash video rendering process, or is it accomplished using a different method?

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