What is the difference between MPC embeded VOBSUB filter and external VOBSUB Filter

[lol_123]

Does anyone know about the difference between mpc internal Vobsub filter and external Vobsub ?
It seems to me, the external one can support blend the subtitle at VMR 7 windowed mode, but the internal one only supports subtitle function at VMR 7 renderless mode, and renderless mode consumed more CPU resource.
If it is ture, why not use the external one to replace the MPC internal one?

Do i make sense here?:helpful:

[clsid]

The external one draws the subtitles onto the video BEFORE the video gets send to the renderer. The advantage of this method is that it will work with all renderers.

The internal one sends the subtitle image data to the renderer. The renderer then places them onto the video. This method requires a compatible renderer (like VMR-7/9 renderless, EVR custom presenter). The advantage of this method is that it also works with DXVA.

[lol_123]

thanks clsid, i got it, let me repeat what you are saying here, the external one is a transform filter so that it can work with all renders, the internal one is not a transform filter, it just takes advantage of some of VMR 7/9 renderless characteristics. So you can add subtitle to video at any time without re-connecting the DS filters.