I cant get rid of the black plain at the begining on a video

Hi, i cant seem to get rid of this black plain at the beginning of my video. it is not the overall exported video, but rather i imported a video i had made. It works all well and good with an alfa background, however its before the video even starts to play, dose this pesky black void show up. Iv tried un looping the video, but to no avail. i cant fine how to fix this. could someone please help me?