利用超取样原理向原影片添加覆盖，主要用来加ASS字幕。
利用超取样原理向原影片覆盖内容
由于使用了超采样，可以对覆盖的内容施加模糊效果、更高的采样点可以减少锯齿，以达到更好的覆盖效果。
示例：
SSOverlay("""
TextSub("伸懒腰旅行.悉尼.班花--已翻译--已轴.ass")
""", dar_fit=16.0/9, ss_rate=1.2, blur=0.7)
Author : Mikey
E-mail : [email protected]
项目网址 : https://github.com/qiangbro/SupersamplingOverlay
新版下载 : https://github.com/qiangbro/SupersamplingOverlay/releases
所在团队 : 有村花纯字幕组
感谢您的使用与测试，如果遇到bug，欢迎反馈。
再次感谢，祝您生活愉快！
Mikey 2016.8
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