@Override
    public String toString() {
        return this.value;
    }
The cadence MediaConvert follows for generating thumbnails. If set to FOLLOW_IFRAME, MediaConvert generates
thumbnails for each IDR frame in the output (matching the GOP cadence). If set to FOLLOW_CUSTOM, MediaConvert
generates thumbnails according to the interval you specify in thumbnailInterval.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/HlsIntervalCadence.java