VSFilter

VSFilter / DirectVobSub is a directShow subtitle filter, it integrates automatically with any directshow player like the Windows Media Player, Media Player Classic, Zoom Player, etc.

It can also be used as a plugin for AviSynth and Virtualdub(use the VSFilter.dll). Install the plugin manually by extract it to a folder and Start->Run and type regsvr32 "C:Program FilesVSSplitter.dll".