调用start开始播放，drain等待播放完成，close释放音频线路。
Call start to begin playback and drain to wait until the playback is complete, and close to release the audio line.
短片播放完毕，这对夫妇低头再看哈维，只见它已把行李箱收拾好，蹲坐着等待他们把自己领回家。
When the film ends, the couple look down to see that Harvey is sitting waiting for them, suitcase already packed.
当用户第一次试图允许该软件时，会被告知等待媒体播放器寻找视频库。
When the user first tries to run the app, he will be told to wait for the media player to find the video library.
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