Reduced video quality when slowed down

Is it normal for the video quality of slowed down footage to be less than the original file.
I think the orignal copied file format was MOV (JVC Camcorder seems to generate .MOV and .MOI files) which imports to iMovie09 fine and good quality.
When I move a clip into the Project Viewer and then want to change the speed of the clip, iMovie converts the clip (not sure what format it converts into). When I slow the clip down (to 25%) the quality is reduced.
Is this something I'm doing wrong or is it the original file type? Also, will my original clip be permanently converted into this other form or will it still be intact (therefore just what is in the Project Viewer is the converted format)?
Any help would be appreciated.
Regards

emlelrirsi wrote:
.. Source is SD
bad news..
could be, that adding effect (=any) drops quality by halve..
often discussed here:
when source is DV, iM09 processes interlaced video only single-field.
I have no source files of SD from non-tape-based devices.. perhaps here, the same quality-drop happens..
if you don't mind, would you like to send me a PM? mail adress down below in green..- you can participate in some.. 'tests'.. no, you don't get hurt, just your camera.. kiddin'!!
there's a simple workaround to avoid this, and there's a free 3rd party tool which - maybe - offers a much better slowmo than iMovie..
send me a mail.. I'd like to see, how non-tape SD behaves..

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HSTompson
It was not until Mary Lou Frost posted in your thread today that I realized that I did not see and reply to your questions in post 4 of your thread (dated December 15, 2014). Sorry about that.
If you want to match up the properties of the export file with the properties of the Timeline source media, often you need to direct your attention to
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Message was edited by: Sheryl Kingstone

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Reduced video quality when slowed down

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