What would happen if I edit in ProRes422, 1920x1080i 16:9, square and put a .png along the timeline that defines a 4:3 ratio as a guide. After all the editing, delete the graphic, switch to Safe RT, render and export as QT movie using current settings. Then create a 640×480 4:3 sequence, bring the 16:9 .mov into the 4:3 timeline and export again as QT movie. Finally, bring the 4:3 .mov into Adobe Media Encoder and reformat to .flv. Is this dumb? Would anything blow up? I tried it this morning and it seems to work…