DVD Disc's

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Hi,I am trying to convert dvix movie to a DVD.I am using WinAVI to do so.The size of the original file size is 702MB(.AVI Format).I converted that into DVD and then the file size was 3.36GB.However while trying to convert i am getting a prompt saying that i there isnt enough space in the disc wheresas, the disc space is 4.7GB.Hence i am here discssing this with you all....When the file size is less of what has to be burned why is it not taking it inspite that being a new disc ..any one help........