我最近在学字幕特效，但一开始就有问题了，在字幕边缘叠加的地方总出现马赛克，效果好差啊！好难看，要怎么去掉啊！
[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: 2,Courier New,0,&H001C77FC,&HF0000000,&H281C77FC,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,38,0,2,30,30,30,134
Style: 5,Courier New,0,&H001C77FC,&HF0000000,&H501C77FC,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,40,0,2,30,30,30,134
Style: 6,Courier New,0,&H001C77FC,&HF0000000,&H781C77FC,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,42,0,2,30,30,30,134
Style: 7,Courier New,0,&H001C77FC,&HF0000000,&HA01C77FC,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,44,0,2,30,30,30,134
Style: 8,Courier New,0,&H001C77FC,&HF0000000,&HC81C77FC,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,46,0,2,30,30,30,134
Style: 9,Courier New,0,&H001C77FC,&HF0000000,&H28FFFFFF,&H00FFFFFF,-1,0,0,0,100,100,0,0.00,1,45,0,2,30,30,30,134
Style: 3,BatangChe,14,&H0041F6F8,&HF0000000,&H00000000,&HF0000000,-1,0,0,0,100,100,0,0.00,1,0,0,2,30,30,10,1
Style: 4,方正粗圆简体,24,&H00FFFFFF,&HF0000000,&H001C77FC,&HF0000000,-1,0,0,0,100,100,0,0.00,1,1,0,2,30,30,30,1
[Events]
Format: Layer, Start, End, Style, Actor, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:29.00,0:00:37.00,9,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:29.00,0:00:37.00,8,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:29.00,0:00:37.00,7,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:29.00,0:00:37.00,6,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:29.00,0:00:37.00,5,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:29.00,0:00:37.00,2,NTP,0000,0000,0000,,{\move(-48,-48,187,48,0,4000)}{\pos(187,48)}○
Dialogue: 0,0:00:33.00,0:00:33.70,4,NTP,0000,0000,0000,,{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:33.70,0:00:34.20,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:34.20,0:00:35.00,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:35.00,0:00:35.80,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:35.20,0:00:35.80,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:35.80,0:00:37.00,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(187,48)}{\frz15}酢浆草
Dialogue: 0,0:00:33.00,0:00:33.70,4,NTP,0000,0000,0000,,{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:33.70,0:00:34.20,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:34.20,0:00:35.00,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:35.00,0:00:35.80,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:35.20,0:00:35.80,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:35.80,0:00:37.00,4,NTP,0000,0000,0000,,{\t(0,150,,\fscx120\fscy120)}{\fad(500,0)}{\pos(194,78)}{\fs20}{\frz15}字幕组
Dialogue: 0,0:00:33.00,0:00:37.00,3,NTP,0000,0000,0000,,{\fad(500,0)}{\pos(187,54)}{\frz15}{\fscy50}oxalisc-sub
效果如下：
圆形是一层层叠加的，边缘有马赛克，字与园的边缘也有马赛克！
为什么边缘叠加的地方会有马赛克啊！
求解决方法或改进我的特效使其没马赛克
