ConvertxtoDVD help!




I just installed this and wanted to convert this Pal version Video mode to NTSC. I ripped the DVD into video files and add the files into ConvertxtoDVD.
all files such as bup, multiple vob, ifo files into the new project. the previews and details shows 121mins length of movie but when it got converted it only converted 15mins of the movie. Why is that? HELP!! am I doing something wrong here? do i have into the vob files one at a time or convert it one at a time? please help me. thanks