public void setFormat(String format) {
        this.format = format;
    }
<p>
The format of thumbnails, if any. Valid values are <code>jpg</code> and <code>png</code>.
</p>
<p>
You specify whether you want Elastic Transcoder to create thumbnails when you create a job.
</p>

@param format
       The format of thumbnails, if any. Valid values are <code>jpg</code> and <code>png</code>. </p>
       <p>
       You specify whether you want Elastic Transcoder to create thumbnails when you create a job.
aws-java-sdk-elastictranscoder/src/main/java/com/amazonaws/services/elastictranscoder/model/Thumbnails.java