I have been using imovie for awhile. I usually take video at 2k. When I upload to youtube or Vimeo the highest res choice I have is 1080. Is it possible to render a video higher for either youtube or vimeo.
Is your iMovie output stuck at 720p, even though you fed it a higher resolution video? While trying to record a screencast from a 27-inch Retina iMac, Josh Centers discovered the fix.