Can I trim without doing ANY transcoding?

I have video files in MOV and M4V which are H264. Those files play beautifully from a website but they are too long. I have QuickTime Player Pro 7.6.9 so I'm intending using it to edit them (by which I mean just trim them - no fiddling with anything else).
These MOV and M4V files have already been transcoded. When I "Export" them from QTP the quality seems to degrade. I've read that transcoding more than once may degrade the video quality. It looks as if every option available to Export them from QTP involves more transcoding of some sort.
Is there a way that I can edit (ie just trim) them in QTP but have it export the files exactly as they are now, without touching the coding at all?

Currently the file sizes are large. I was hoping that trimming to the few minutes I want would reduce the file size.
If you trim the clip properly before copying the trimmed portion to a new file container, only the desired content will be contained in the new MOV file making the file size smaller. How much smaller, of course, depends on how much of the clip you trim and remove.
If I'm understanding you correctly, QTP will mark the In and Out points but when I use 'Save as.." it will leave the full file size intact (??) and still upload to the server the full 15 minutes worth of file (??) and visitors to the website who are using mobiles may view the full 15 minutes still???
No. What I said was that if you "mark" the content you wish to keep and then use the "Trim to Selection" option to create a "timeline" only containing the segment of the file you wish to keep, the, when you use the "Save As..." command, only the trimmed content will be copied to the new MOV file.
On the other hand, if you just mark the content without physically trimming it, then the entire movie will be copied to the new file along with the markers which only the QT Player, iTunes, etc. will then play correctly while apps like VLC will continue to play the whole file. In addition. If you use the "Save" command to keep the data in its original file container, then only the markers are saved and the file still contains all of the original data plus the newly added markers.
I repeat, to create a "smaller" file with only the trimmed data in it, you must mark, trim, and write the desired data to a new MOV file container. Thereafter you simply replace the current online files with the new one(s) you've created. You can then decide whether or not you want to keep or delete the original file and simply keep the new file.

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0 down vote favorite I would like to ask the following question. I am using mac os x 10.9 maverics me quicktime player version 10.3. Can I trim a video recording without having to press the pause or save it as a file? Or can I add a new recording t

0 down vote favorite
I would like to ask the following question. I am using mac os x 10.9 maverics me quicktime player version 10.3. Can I trim a video recording without having to press the pause or save it as a file? Or can I add a new recording to a video file? Thanks in advance

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Can I trim without doing ANY transcoding?

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