要對照Format裡的Blod來改。
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding

所以粗體是&H000000後面的0改為-1,
&H000000,-1

改SSA用作字幕的軟體吃進去改比較好。可以試一下這個
http://cysub.7am-online.com/wiki/doku.php?id=zhtw:index