Why is the quality of my mpeg-4 video degrading when I publish them through IMovie?

The vids are in mpeg-4 format to start off with.  I import them into IM and add some introduction screens and crossfades then Share/YouTube. Should I follow some other methodology to maintain quality?

This is the iPhoto forum - I will request that your quesion be moved to the iMovie forum where Movie experts hang out
LN

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