Save as Using Passthrough?

When using "Save as" with the self-contained movie option, does QuickTime simply passthrough the audio and video tracks to a mov container or is it re-encoding the tracks while moving them to the mov container?
I have an mkv video with an h.264 video track and ac-3 audio track. When I use "Save as" self-contained movie, it works perfectly. The mov file it produces has the h.264 and ac-3 tracks like the mkv did.
I would like to know if it passed through the original tracks from the mkv unaltered or did it re-encode them?
Thanks
P.S. - Yes, I'm using Perian to handle mkv files in QuickTime.

I would like to know if it passed through the original tracks from the mkv unaltered or did it re-encode them
The data tracks are simply copied from one container to the other. No re-compression is performed.

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