视频播放,格式上有一定的要求，在windows media play 中能播放的就能播放！-Video playback, the format has certain requirements, in windows media play can play can play!

此应用的的主要功能是帮助我们顺利播放媒体文件，包括媒体文件的呈现，快进快退声音大小之类的。-This file is a source file that it can tell us how to play media file.