Can't burn DVDs over 700 mb

hi all.
i am having problems burning movies i have downloaded. I can’t get any movie to burn properly if its over 700Mb on Nero. Do I need a shrink program? If so any suggestions. If not what am I doing wrong.
Thank You

Get a DVD-9 Disc, compress those movies to one disc

Professional DVD Copy-Compress DVD-9 to DVD-5, Copy Region DVDs.
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DVD Burner-Burn various video formats to DVD Disc/ISO File/DVD Folder.

Just like sanjun said, you can burn your video on DVD-9 Disc.

video to DVD
AVI to DVD
MKV to DVD