Why is one hour of video 12 gb????

I have never experienced this before. I import one hour of video and idvd complains that it won't fit (even on a dl dvd). I look at the clip info- 12 gb!!!.
I have never had a problem making idvd projects on this imac g5. Is there something suddenly wrong with the compression?

Hi theresaa:
The file size for uncompressed DV material is 12 GB for one hour of video so that seems correct..
And, a DVD holds a maximum of 120 min of video regardless of the original file size.
Use File / Share / iDVD and it will automatically compress it to fit.
Sue

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