user14060: was wondering if any of you knew how to fix this issue. When I render my comp in After Effects, I see these weird glitches in the render (like black triangular spots of missing video).
I have uploaded an example of the issue here: 



user14292: Had the same problem. Put a black solid in the background. It worked for me.

14060: <p>was wondering if any of you knew how to fix this issue. When I render my comp in After Effects, I see these weird glitches in the render (like black triangular spots of missing video).</p>

<p>I have uploaded an example of the issue here: <div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/U6JlYaAqJQg?start=0"></iframe>
            </div></div></p>
 14292: <p>Had the same problem. Put a black solid in the background. It worked for me.</p>
