12GB per hour of HD footage instead of 29GB?

Hi,
I recently switched over to HD camera (Sony HDR-HC1E). This is a DV tape cam.
Im editing in imovie 6.0.4.
I always back up my files by exporting via imovie "full quality" when i used to do this with SD content i would get a DV file as result, now on HD i get a .mov file.
I used to get a 12GB file for a 60min movie. Now with HD i am getting 29GB per hour.
I hear other people talking about 12GB per hour for HD content.
Can anyone please tell me how this is possible?
I am going through external hard drives at lightning speed!
Thanks
Dave

Hi Dave
There's actually a big difference between a DV stream (whether recorded to tape or file) and a .mov file.
DV or HDV footage is recorded at 25Mbps - megabits per second. This translates to 90000Mb per hour, divide by 8 to convert bits to bytes, and you get 11.2GB/hour. That's constant, whether on the tape or saved as a DV file. Note that DV is pretty compressed.
Now, when iMovie (or any other video conversion program) saves a .mov file, it's no longer a DV stream. It can be any of the codecs (video formats) that your program supports, and there are a wide range of codecs for both SD and HD. These different codecs will use different file sizes depending on their level of compression. (Just like mp3, a compressed audio codec, vs AIFF, an uncompressed codec.)
You can choose to optimize video on import or choose a smaller format on export (large, rather than full size) which will reduce the frame size of your footage, which may be a good solution for you, depending on what you ultimately plan to do with the material. (Edit: actually, not with iMovie 6 - thanks, Karsten Newer versions of iMovie will help you there. )
Matt
Message was edited by: Matt Clifton

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