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David - I think Christopher may have wanted to pan and scan around his HD file in SD (which is a different workflow to what you were suggesting). I can confirm this is an issue with the Avid processing architecture for HD.
Unfortunately the only way around this (until Avid address it) may be to go to After Effects to pan and scan your material. I've tried BCC/3D PIP (High and low quality)/and Reformat - Pan and Scan. None of these solutions appears to correctly subsample the original media and upscale. Instead I thinkthe DVE "window" in SD is limited to 720x576, so Avid downscales the HD into it's SD timeline (using RT) then samples back up that reduced image.
A resolution independent architecture like AvidFX/BorisRED plug in may solve this but I suspect you won't be able to use the clips in the Avid timeline but instead will have to reload it into the plug ins. I say this because BCC which uses the same architecture didn't work.
This is true of HDV (which looks terrible in an SD project anyway or at least 720P does) and DnxHD transcoded material, which at least looks good downconverted on the fly to SD.
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