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Hi w4yne and welcome to the forum.
Adding titles etc should be less of a problem than cutting out unwated sections of video. The reason for the problems is that MPEC compression only updates each frame of video with the bits that have changed. Therefore if you cut out frames that are partal then it causes problems for those that follow it, until there is a full frame refresh (about every 20-30 frames I think). This can cause pixelation and jumpy movement.
As I say adding titles should be fine as you are adding aditional information rather than removeing it. Although I must confess that this is just an educated guess as I have never done any editing with compressed footage other than the authoring in Movie Factory.
Mark.
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