Quicktime doubles file size - Why?

In Quicktime Pro I open up a dv video file that is one hour, 12 GB. I select Save As and it tells me that to save the file as an .mov will take 24 GB.
Q1: Why is this the case?
Q2: My properties window lists a video track, a sound track, and a track that appears to be the original DV file. Why the redundancy?
Q3: Can I reduce the file size without exporting or using the Save as Reference Movie option?

As a test, I chose SAVE AS on the original 25gb videot, the SAVE AS window told me that the new SAVE AS file would be 50gb!! I'm new to all this, so I have no idea what I'm doing wrong!
To some extent it is a numbers game. In an MOV file the DV audio and DV video are counted separately and added together in both the "Inspector" window and the Finder "Info" window. In the DV file container the "Inspector" window still doubles the file size but the Finder "Info" window only counts a single DV stream. If it Bothers you, either do your trimming in MPEG Streamclip (free) or, if you've already saved some files in MOV containers, then open them in MPEG Streamclip and use the "Save As..." option to re-save them but select the "DV" file container this time. When done, compare the DV file with the MOV file using the Finder "Info" window.

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Quicktime save doubles file size!

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As a test, I chose SAVE AS on the original 25gb videot, the SAVE AS window told me that the new SAVE AS file would be 50gb!! I'm new to all this, so I have no idea what I'm doing wrong!
To some extent it is a numbers game. In an MOV file the DV audio and DV video are counted separately and added together in both the "Inspector" window and the Finder "Info" window. In the DV file container the "Inspector" window still doubles the file size but the Finder "Info" window only counts a single DV stream. If it Bothers you, either do your trimming in MPEG Streamclip (free) or, if you've already saved some files in MOV containers, then open them in MPEG Streamclip and use the "Save As..." option to re-save them but select the "DV" file container this time. When done, compare the DV file with the MOV file using the Finder "Info" window.

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Per Berntsen wrote:
My view on this is somewhat different ...
Jpgs should never be edited, except as a last resort. And it defeats the purpose of working with raw files if you export a jpg, and then edit it.
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JPEG QUALITY SETTINGS
Photoshop
Description
Lightroom
0
Low
0-7%
1
Low
8-15%
2
Low
16-23%
3
Low
24-30%
4
Low
31-38%
5
Med
39-46%
6
Med
47-53%
7
Med
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8
High
62-69%
9
High
70-76%
10
Max
77-84%
11
Max
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12
Max
93-100%
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Is there any way I can get the Dimensions back to 640x480 and can the necessary data reference be resolved.
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closed

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Yes, I am looking at an older project to see if it was just the new video I was using in my newer project that was increasing the size. It seems this is not the case.
a. I'm not sure where to locate the bitrate of all of the video on the time line. If you are talking about the original video and not the edited versions, the properties state that the bit rate for each video is about 17200kbps. I do have photos as well as video on the timeline.
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Frame Rate: 29.97
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b. No I am not customizing the preset at all.
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Sure thing!
And thank you for your help!
Shou

Quicktime doubles file size - Why?

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