I have finished editing a movie shot on a GoPro Hero in 1080p HD and I want to export it in HD, but it will not give me that option. The options only go up to "Large" on exporting. I tried re-exporting other movies I have made with my GoPro and they all present the HD exporting option, while the movie I want to export still will not allow me to do so in HD. I imported the movie "original size" so I am very confused. Any ideas?