@Override
    public String toString() {
        return this.value;
    }
Optional. Use Quality tuning level to choose how you want to trade off encoding speed for output video quality. The
default behavior is faster, lower quality, multi-pass encoding.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/Vp9QualityTuningLevel.java