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found an easy way to convert PAL dvd to NTSC dvd without loosing quality.
Here goes -
You will need the following:
SmartRipper
ac3decgui
DVDX 1.7 or above
Some kind of dvd authoring software
(I use dvdit pe)
and ofcourse burning software
(I use Nero 5.5.99)

OK, now using smartripper, you will need to strip the movie VOB files, the video_ts.ifo and VTS_01_0.IFO to the hard drive, you will also need to Demux the audio 6ch to a separate file, this file will be saved as a .AC3 file. Once you have these files you will then convert your .AC3 to wave using ac3decgui. Now that you have your VOB files and your wav file you can begin to convert from PAL to ntsc.

Here is where you open dvdx 1.7 or above, select file / open ifo, then go to where your VOB files are and select the VTS_01_0.IFO for input, now select only the following:
use aspi
demacrovision
dolby surround
(from the drop down) select english AC3 6ch
(from the drop down) select 29.97 (NTSC)
Detect progr. 24HZ
Audio / Video synchronization
Select OK
If you get an error auth.dll, ignore and select OK

From here go to your output settings, select Super Vidio CD (mpeg2)
change your resolution size to 720x480 click the whole button
select the custom button
change the max output size to 4300mb
click apply
change your audio bitrate kbits to 384
Click Apply

Select your Ouput folder, save your file with the name of the movie and save as a .mpg file.

Then select Encode, sit back and wait. Usually takes about 4 - 8 hours. When this is complete, you can watch the converted movie as normal. To convert to dvd playable, you would use your authoring software, and if you know how to do that you will have a recreated disc with minimal loss of quality in no time. I've done this with the Back to the future movies, and have been extremely happy with the outcome, no choppy picture, no flashes, just normal movie.

Good Luck!!!!! Worked for me, Hope it works for you!!!

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