Length	Type	Description
For each subtitle...
4	String	« CHID »
4	LongInt	Length of Char ID
8	String	Char ID
4	LongInt	Length of subtitle text + null bytes + 8
	String	Subtitle text
Depend	Byte	Null bytes
4	String	« EXTD » (if present)
4	LongInt	Length of EXTD section
	Byte	Data
4	String	« CLIP » (if present)
4	LongInt	Length of CLIP section
	Byte	Data
4	String	« ENDC »
	Byte	See notes	--->	Subtitles are grouped in block of 2048 bytes. By default, there's 4 null bytes after a subtitle. When there's no more room in a block for a subtitle, the remaining space is filled with null bytes to equal 2048 bytes.