用记事本打开SSA,找到[v4 Styles],把里面的最后一个数字改成1
例
[v4 Styles]
Format: Name,Fontname,Fontsize,PrimaryColour,SecondaryColour,TertiaryColour,BackColour,Bold,Italic,BorderStyle,Outline,Shadow,Alignment,MarginL,MarginR,MarginV,Encoding
Style: Default,Fixedsys,16,16777215,65535,65280,0,0,0,3,0,0,2,30,30,30,1 <-这个