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Does iMovie change MP4 files at all when importing them?

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oxband


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I have some archival footage I downloaded off the internet for an audio project. I'm working with someone who wants to make them short clips and only knows how to use iMovie.

If a person imports an MP4 file to iMovie and plays with it there, does iMovie change the file at all when it imports it? Is there any loss of audio quality?
 
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I've done this several times. As for the sound - I did not see any changes, the quality remains the same.
But with the image quality is not so clear. For the first time everything was great for me, the quality remained the same. But all the following cases are not as successful. Unintelligible noises appeared on the video (
 
stelli

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Same happened with me. The quality of image was not that of original image. It had some changes which led the image quality go bad.
 
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