ace in java.lang" class="externalLink" target="_top">Object</a> trackSelectionData</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div>
<div class="block">Optional data associated with the selection of the track to which the data belongs. Null if the
 data does not belong to a track.</div>
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<h4>mediaStartTimeMs</h4>
<pre>public final&nbsp;long mediaStartTimeMs</pre>
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