Thanks for your attention. I have a perplexing issue when exporting finished files to MP4. My Projects have in each of them a 'Custom' colour and on that a shape mask to make the effect of highlighting with a spotlight a subject (map) on a darkened background. All fine until I export to MP4 the spotlight is smaller than what it was in the project, blackening out half of the subject.
Thanks for your help.
Gary Caganoff, Lysis Films.
Editing on FCX, shooting on Sony A7s + Atomos Shogun and Sony Z7 HDV.