@Override
    public String toString() {
        return this.value;
    }
Optional. Specify how the service determines the pixel aspect ratio (PAR) for this output. The default behavior,
Follow source, uses the PAR from your input video for your output. To specify a different PAR in the console, choose
any value other than Follow source. When you choose SPECIFIED for this setting, you must also specify values for the
parNumerator and parDenominator settings.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/Vp8ParControl.java