Here you have the sepecification of the subpicture file format created by VobEdit.
|2 bytes Identifier: 'SP'||8 bytes PTS of this subpicture||The raw subpicture frame data.|
For each presented subpicture, VobEdit creates a 10 bytes
The first 2 bytes are used as identifier and simply contain the characters: 'SP'.
The next 8 bytes contain the true PTS value (Prestentation Time Stamp) when this subpicture will be presented.
Finally the raw subpicture frame data of the VOB file gets appended to the header.
Then follows the next header and subpicture and so forth...