non anamorphic dvd to anamorphic dvd?

[iThinkYouBrokeIt]

Is it possible to convert a non-anamorphic dvd to an anamorphic dvd and keep the menu system?

if so, how do i do this?

[guns1inger]

Possibly, but there is nothing to be gained by the exercise except heartache and misery. You would have to extract the movie from the DVD structure, demux the video and audio, load the audio into an editor that can accept mpeg-2, crop the top and bottom of the image (60 pixels for NTSC, 72 for PAL, from both the top and the bottom), resize back to full resolution, re-encode back to mpeg-2 with the 16:9 flag set, remux the audio, replace the original movie with your new one, re-write the ifo files to accept the new movie settings (16:9) and rebuild the vobs.

The problem with this ? There are at least 2 points in this process where you will lose image quality. When you crop and resize, and when you re-encode. Depending on the software you use, you could lose a little, or a lot. And for this you gain nothing. Anamorphic discs are (usually) higher quality because the source was encoded with the extra data. You don't have this data, and you cannot recreate it by stretching the image. All you can do is make it worse.

This is absolute best case scenario. You may find you cannot put the movie back into the original disk, and will be forced to author a new disk from scratch.