When using progressive video download, the media infrastructure determines how much vid-eo it needs to cache before it can start playing back the video.
当使用视频连续下载的时候，媒体环境决定在视频播放之前多少视频数据需要被缓冲。
When using progressive video download, the media infrastructure determines how much vid-eo it needs to cache before it can start playing back the video.
当使用视频连续下载的时候，媒体环境决定在视频播放之前多少视频数据需要被缓冲。
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