1.Download and install TMPGEnc.

2.File --> MPEG Tools --> Cut and Merge

3.Change the type to "MPEG-1 Video-CD" for standard VCDs or "MPEG-1 　Video-CD (non-standard) for XVCDs

4.Add the clip that you want to have sequence headers inserted into.

5.Browse for a new output save file

6.Run.