.mpg (SVCD) to a subtitled .mpg (SVCD)?

[KeepWalking]

I have an archive .mpg that has been extracted from a (bin/.cue) SVCD.

I need to add to permanent subtitles to this archive mpg for later write it to a SVCD again.

Not necessary convert it to another format, only need to add the subtitles.

Please, I kwnow the basic mode to do that, (Framserving with virtual dub and reencode with tmpegnc) but with this mode (reencode), the quality of the movie is very low.

Input:
.mpg - SVCD movie without subs
.ssa - subtitles my movie

Output
.mpg - SVCD movie with subs.

Which would be the most easy way to do this? What software I need?

[hoozdapimp]

what does this has to do with DVD-RB? :)

There is a program called SubMux (Command Line) or WinSubMux (Windows GUI) that will let you multiplex mpg files with .sub files, but I'm not sure if .sub is the same as .ssa