With VAST complaint video ads, you may get a "nested" VAST (VAST Wrappers), which will eventually yield a MediaFile that is a media that you could preload (e.g. MP4/WebM/flv, etc.). With VAST complaint video ads, you may get a "n
阅读背景：
预加载VPAID Flash广告 - 不可能/不允许？为什么？
来源：互联网
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