@Override
    public String toString() {
        return this.value;
    }
There are two types of input sources, static and dynamic. If an input source is dynamic you can change the source url
of the input dynamically using an input switch action. Currently, two input types support a dynamic url at this time,
MP4_FILE and TS_FILE. By default all input sources are static.
aws-java-sdk-medialive/src/main/java/com/amazonaws/services/medialive/model/InputSourceType.java