public MotionImageInserter withPlayback(String playback) {
        setPlayback(playback);
        return this;
    }
Specify whether your motion graphic overlay repeats on a loop or plays only once.

@param playback
       Specify whether your motion graphic overlay repeats on a loop or plays only once.
@return Returns a reference to this object so that method calls can be chained together.
@see MotionImagePlayback
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/MotionImageInserter.java