Requirements for the overlay file
Set up the image files that you want to insert over your video as follows:
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File type: Use .png or .tga.
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Aspect ratio: Use any aspect ratio; it doesn't need to match the aspect ratio of the underlying video.
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Size in pixels: Use any size. If the overlaid image is larger than the output video frame, the service crops the image at the edge of the frame.
Note
In jobs that scale the video resolution, whether your overlay scales with your video depends on where you specify the image overlay. For more information, see Sizing overlays.