ly passed <a href="../trackselection/ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection"><code>TrackSelections</code></a> are no longer valid,
 and any references to them must be updated to point to the new selections.

 <p>This method is only called after the period has been prepared.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="MediaPeriod.html#selectTracks(com.google.android.exoplayer2.trackselection.ExoTrackSelection