Quicktime X - Save As "Movie" - Is it transcoding free?

Hi!
I tried searching the forums, but were unable to come to a conclusive answer...
Background:
I have a bunch of (very long) video clips. Some of them are .avi clips from my old DV video camera, other are just long clips from my new digital camera, and some of them are from my iPhone.
I'd like to "trim" these into more manageable sizes, some of them are GBs in size....
Quicktime X "trim" feature is excellent for doing this, and i can then choose "Save As" and select "Movie" to "Save a movie file that contains media in the same format as the original movie.".
However, what i am wondering is:
__Does Quicktime X transcode the video during the process, or is it completely "passthrough"/"lossless"__ (i.e. It doesn't decode/encode the frames, it simple copies the old frames in the new file).
I understand the the first few frames/last few frames will require lossy "encode/decode" due to the nature of many video formats, but i'm curious how Quicktime X handles the rest of the frames.
Thanks in advance to anyone who has the answer!

However, what i am wondering is: __Does Quicktime X transcode the video during the process, or is it completely "passthrough"/"lossless"__ (i.e. It doesn't decode/encode the frames, it simple copies the old frames in the new file).
No, the "Save As... Movie" option does not transcode the content. It merely copies the range of designated frames from its current file container to an MOV file container.

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