How to convert 16:9 dvd to 4:3 dvd?

[acerRI]

Hi to everyone on this forum. Like i said in the subject does anyone knows how to do that? It´s not important is it pal or ntsc dvd,just how to convert.
Thanks for answers

[thecoalman]

Depends on what format you have the video in now and how you want to go about it.

If you just want to change the aspect that info is contained in the ifo file on the disc or the video header. The ifo file can be edited with ifoedit, not sure about the video file but this info can be changed (depending on your software) during the capture, edit or author stage. This of course is going to stretch the video vertically.

If you want it to display with the correct aspect you need to crop it. This is a feature of of higher end editing software..... You can use avisynth too but I'm unfamiliar with that app.