Can a video clip lose quality with ,multiple rerendering???

Question

I have a question, can rerender a video file, say I rendered and found I forgot to add chapter markers to sequence, rendered it to a Quicktime DV clip, I deleted all render files after export. Now all I have is the DV clip that needs to have chapter markers added, When I open it in FCP 5, and add chapter markers and then export to a new updated Quicktime DV movie. Will I be sacrificing the quality of the this DV clip, if I now go in yet again, and add some Motion graphics, to it? Once again all render files are deleted. I guess what I am asking is if you open edit, several times using new render files each time you make changes with this compromise the quality of the final video?
As always thanks in advance for your reply to my Post,
Sebastian

Answer 1

Well... every time you make a change to a clip or sequence that requires a re-render, the old files are chucked and FCP starts all over again with the render process. So, yes and no. A clip with no effects is a simple file transfer, if you will, while adding something that requires a render will make a new render clip that, in the timeline, replaces the original media.
Remember that FCP does non-destructive editing, your original clips reside unchanged on your drive(s.)