媒体播放器主要实现了显示媒体文件的播放进度、播放时间等，并控制播放进度、音量大小、以及调用字幕叠加、视频设置等子窗口。-Main achieved the media player displays the progress of media file playback, play time, etc., and control the playback progress, the volume size, and call the subtitle overlay, video setting