he same ExoPlayer code). See <a href="https://developer.android.com/guide/topics/media/media3/getting-started/migration-guide">the
     migration guide</a> for more details, including a script to help with the migration.</div>
</div>
<div class="block">Identifies a specific playback of a <a href="../Timeline.Period.html" title="class in com.google.android.exoplayer2"><code>Timeline.Period</code></a>.

 <p>A <a href="../Timeline.Period.html" title="class in com.google.android.exoplayer2"><code>Timeline.Perio