完成视频文件的播放、暂停、停止功能；支持进度条显示功能；实现视频图像的全屏、最小化、

并能够在该软件界面上调节音量大小

-Complete video file playback, pause, stop function　support for the progress bar display　to achieve full-screen video image, minimize,

The software interface and the ability to adjust the volume on