I have recorded stuff onto my hard drive using WinFast PVR and these files are in DVD MPEG-2 format. They are approx 90min long and are 4-5GB in size. I would like to store these files on DVD-Rs. First prize would be compressing the files to a size closer to 1GB and then burning them to DVD-Rs. Would I need to convert them to MPEG-4 or the like? If I use DVD authoring software to make the programs into a DVD, could I achieve this compression by using DVD Shrink?