Animation of two videos in Blender I am attempting to run one video over the top of another.  In the base video, I have a guy running down a street.  This video is on a plane.  I have a second video that I created with some pain to render a cheetah running with an alpha layer using WebM codec. I have inserted this video on a smaller plane and constrained the plane to the street of the first video using keyframes so that it appears that the cheetah is chasing the guy.  I am unable to get rid of the black background on the cheetah video. Any help would be grateful.  Running Blender 2.91
Check the alpha blend method on the cheetah clip material settings. I recommend “hashed.” If that is correct, check that in the material the alpha of the image is connected to the shader’s alpha somehow (using a mix shader node with the alpha connected to the factor, and a transparent shader node on one input, works good).