public void setKey(String key) {
        this.key = key;
    }
<p>
The name of the sidecar caption file that you want Elastic Transcoder to include in the output file.
</p>

@param key
       The name of the sidecar caption file that you want Elastic Transcoder to include in the output file.
aws-java-sdk-elastictranscoder/src/main/java/com/amazonaws/services/elastictranscoder/model/CaptionSource.java