public String getAspectRatio() {
        return this.aspectRatio;
    }
<important>
<p>
To better control resolution and aspect ratio of thumbnails, we recommend that you use the values
<code>MaxWidth</code>, <code>MaxHeight</code>, <code>SizingPolicy</code>, and <code>PaddingPolicy</code> instead
of <code>Resolution</code> and <code>AspectRatio</code>. The two groups of settings are mutually exclusive. Do
not use them together.
</p>
</important>
<p>
The aspect ratio of thumbnails. Valid values include:
</p>
<p>
<code>auto</code>, <code>1:1</code>, <code>4:3</code>, <code>3:2</code>, <code>16:9</code>
</p>
<p>
If you specify <code>auto</code>, Elastic Transcoder tries to preserve the aspect ratio of the video in the
output file.
</p>

@return <p>
        To better control resolution and aspect ratio of thumbnails, we recommend that you use the values
        <code>MaxWidth</code>, <code>MaxHeight</code>, <code>SizingPolicy</code>, and <code>PaddingPolicy</code>
        instead of <code>Resolution</code> and <code>AspectRatio</code>. The two groups of settings are mutually
        exclusive. Do not use them together.
        </p>
        </important>
        <p>
        The aspect ratio of thumbnails. Valid values include:
        </p>
        <p>
        <code>auto</code>, <code>1:1</code>, <code>4:3</code>, <code>3:2</code>, <code>16:9</code>
        </p>
        <p>
        If you specify <code>auto</code>, Elastic Transcoder tries to preserve the aspect ratio of the video in
        the output file.
aws-java-sdk-elastictranscoder/src/main/java/com/amazonaws/services/elastictranscoder/model/Thumbnails.java