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up converting in timeline
hi. I am editing a project in Final Cut pro that mixes upgraded HD 1080i50 files (1080i to full HD1920 via Pro res422 HQ) with After Effects files. Each digital Quicktime file is high in gegabites and MacBook pro 6.6 (4geg ram) is unable to play the files smoothly from the timeline. My question is: if I down convert all the files to low res quicktimes and edit with these in the timeline, is there a way that I can use the same timeline information and up convert back to full HD for rendering to a FCPro movie file? Any experience with this query would be much appreciated.