java后端的图片、视频处理工具jar包 1.获取视频信息 2.生成视频封面图 3.异步压缩视频（生成输出文件名后，调用异步压缩视频方法，且同一时间只会处理一个视频，多个请求的视频会进行排队处理） 4.异步压缩视频完成时回调通知 5.图片裁切 6.图片压缩
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