Re-importing shared full-quality QT “lossless”?

Is there any loss of quality that would accumulate when sharing a project as a full-quality QT, then importing it back into iMovie, editing it a little, then repeating? I’m thinking of using this workflow as a way of merging lots of little clips and shifted-around audio extractions to a single clip and will probably want to do this a couple of times per project, before compressing it in final form. It’ll eventually wind up as a QT on CD, if that has any bearing on the question.

Is there any loss of quality that would accumulate when sharing a project as a full-quality QT, then importing it back into iMovie, editing it a little, then repeating?
No, IF you take care to use the same DV codec AND you do not edit the clips (i.e. decompress-recompress the DV codec). Straight cuts are OK because no recompression is involved.
...and even editing the clips (adding titles etc) should not produce any visible difference unless the editing app produces its own artifacts. ...and iMovie HD DOES produce its own artifacts to PAL titles (NTSC is OK):
http://www.sjoki.uta.fi/~shmhav/iMovieHD_bugs.html#titlesPAL
BTW, iMovie 4 had a bug where it used the wrong DV codec for PAL. If you didn't notice it, you lost some quality when converting to the correct codec.
http://www.sjoki.uta.fi/~shmhav/iMovie4bugs.html#PAL-DVCPRO

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