how to merge 2 DVDs to 1 DVD-R?

[neutralidea]

I have 2 set of files under .IFO and .VOB for 2 DVDs. I can turn on/off the subtitle of these movies when playing each of them separatedly.

Is there a way to burn these 2 movies to 1 single DVD-R, without loosing the subtitles?

I've tried using the TMPGenc Author to merge these movies in 1 DVD-R. The audio and video part seems working fine. However, the subtitles are gone when I play back with PowerDVD. Any help please?

[Baldrick]

dvd shrink(<--click for guides), but you wont get any menus.

[poncho]

DVD Shrink is the answer.......

Create a DVD with both movies...

I recommend use DVD lab pro for create menu to choice wich movie play....

Good look

[neutralidea]

Thanks for your inputs. I tested and it worked fine. The subtitles are fine..
The quality seems so so. I'm afraid that I'm loosing the sharpness after several conversion steps...

In fact, I'm getting the 2 sets of DVD from 2 separate sets of (m2v, mp2 and sup). I converted them to DVD format (ifo and vob) and use the dvd shrink as you said. Is there a nother way to merge the 2 sets of type m2v-mp2-sup together, without going through the mechanism of converting to dvd format?