QuickTimePro - Export vs Save - Different File sizes

Hi,
with the trim to selection command I selected a bigger part of an AVI-video (Video track format: MPEG-4 DivX v.5 + Audio: Mpeg-1 layer 3 (mp3)).
Although I did not change the video or audio settings I got different file sizes:
The exported video has double the size than the saved file.
Therfore my questions:
What is the reason?
What should I prefer - export or save - trying to get smaller files with the same quality?
Thanks for a tip.Greetings from the heart of Germany
Herbert

HI mrfibuli
I think you are seeing a general housecleaning of things that
were formerly in your library. For example, lets say you took a
fairly large project. Perhaps 80 slides. Then you delete 60 slides.
This would leave many items in the library. They would be there,
but be unused. So you save as, and after a couple of times of doing
this, the unused objects are purged from the file. This is why you
are seeing a difference in size.
Sincerely... Rick

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