Use of/effect of compression markers in Compressor 4...

I have a question about the effect of compression markers in Compressor 4. I know they are used to mark areas where you want compression lessened so that the video looks better (like action scenes or fast camera movement).
I just worked through a Compressor 4 tutorials. The tutorial says using them forces the encoding engine to add more video data for the location vs. other locations in the video stream, thus improving the video quality (at the expense of greater file size, of course).
What I don't understand is how the period for which lesser compression is applied is determined. In other words, if you place a single compression marker, which marks a single frame, how long before and after that marker in the timeline is compression reduced? For instance, if you have a 5 second scene of sports play vs. a 2-minutes of the same action, how does Compressor know how long you want to reduce the video compression around the marker?
I know it can't apply only to the frame the marker marks. But does it apply for a second before and after? Ten seconds? Or does the marker cause compressor to analyze the action around the marker and somehow determine a period for which compression should be lessened?
Thanks!

Here's the in's and out's about using compression markers in Compressor. (The article is using Compressor 3.5, same holds true with Compressor 4.)
http://www.kenstone.net/fcp_homepage/compression_chapter_markers_stone.html
I added compression markers to a video. I missed the part that compression markers only work with MPEG-2 compressing.

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Convert the footage to ProRes LT before editing.
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My main sequence contains 14 nested sequences (chapters and credits).
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Thanks both of you.
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Bkent:
Any experts with Ideas?
Some ideas from a no-expert.
Did you exported your movie from FCP with Chapter Markers? File > Export > QuickTime Movie and select Markers > DVD Studio Pro Markers
If you did, you'll see the markers in Compressor preview. Those Markers must be in your final MPEG2 encoded video and DVDSP must see them.
Post your workflow if that don't that way for you.

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I would take a step back here before going further. William's suggestion might very well clean up the library but something obviously did not go right and to start mucking about in the library might make things worst.
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regards
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I'm not an Adoby guy, hence you may ignore my reply, but Adobe Dynamic Link is obviously not just one way ticket and in most cases works just fine.
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Use of/effect of compression markers in Compressor 4...

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