Huge disc space used when creating a movie

I have made movies of old projected cine film clips and stored these on my extra hard drive. So that I can re arrange and make amanded movies organised under different headings to be made into a DVD, I have tried to create these by dragging various clips into new movies on my desktop.
To my surprise even a small number of imported clips in a new movie take up many gigabytes of space and I get the message that there is not enough memory to continue. The new desktop movie with a few clips takes up much more space that the original much longer movie?
Another thing I cannot understand is that when I create a DVD that includes various movies the completed DVD takes up less disc space that the original movies? Can you help please?
Anthony Philpott

a video contains 30 "frames" per seconds; every frame has 720x480 pixels with 8bit color info... a video contains a lot of data...-
to make such an amount manageable, some programmers invented "compressors" = mathematical algorithms, which try to reduce the amount of data, without losing too much pic quality... more or less..
miniDV uses DV as codec; same does iM (which is for miniDV editing...); this codec is made for editing purposes... 1h DV = 13Gb of data...
DVD uses a different codec, mpeg2, which is for playback only... you can trick the eye, therefor use a more effective compression, 2h videoDVD = 4.7GB of data...
there are much more codecs (~4000), each for a specific need or purpose...
to fullfill the credo simplicity&convenience, Apple "hides" that codecs; iM is working lossless (...mostly) with imports from miniDV; any <120min iM project, containing more then 30GB, does fit on a 4.7 SL-dvd-r... because iDVD encodes automatically with the right settings...
in case, you import OTHER encoded material to iM (mpeg4, divx, h264...) than DV, it gets converted first >> changes its size, in most cases gets much larger...

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