it's usually good to use an ivtc function like telecide even if DGindex reports a high amount of film. sometimes an edit can jump up and bite you, then force film becomes less than ideal. but a sample would be good. you can cut samples out of vobs with chopperXP or neuron's DGindex (DVD2AVI "remastered" essentially). it has a "save projects and demux video" feature, with the ability to set in and out points.