Fix comments for pull request

- Extract duplicated microsecond duration calculation
- Update JavaDoc for CustomRenderersFactory

app/src/main/java/org/schabi/newpipe/player/Player.java

@@ -306,10 +306,11 @@ public final class Player implements PlaybackListener, Listener {
         final int maxSilenceDurationMillis = prefs.getInt(
                 context.getString(R.string.max_silence_duration_key),
                 Integer.parseInt(context.getString(R.string.max_silence_duration_value)));
+        final long maxSilenceDurationMicros = MILLISECONDS.toMicros(maxSilenceDurationMillis);
         final SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
                 new SilenceSkippingAudioProcessor(
-                        MILLISECONDS.toMicros(maxSilenceDurationMillis),
-                        MILLISECONDS.toMicros(maxSilenceDurationMillis),
+                        maxSilenceDurationMicros,
+                        maxSilenceDurationMicros,
                         SilenceSkippingAudioProcessor.DEFAULT_SILENCE_THRESHOLD_LEVEL);
         renderFactory = new CustomRenderersFactory(
                 context, alwaysUseExoplayerSetOutputSurfaceWorkaround,

app/src/main/java/org/schabi/newpipe/player/helper/CustomRenderersFactory.java

@@ -17,8 +17,9 @@ import com.google.android.exoplayer2.video.VideoRendererEventListener;
 import java.util.ArrayList;
 
 /**
- * A {@link DefaultRenderersFactory} which only uses {@link CustomMediaCodecVideoRenderer} as an
- * implementation of video codec renders.
+ * A {@link DefaultRenderersFactory} which uses {@link CustomMediaCodecVideoRenderer} as an
+ * implementation of video codec renders and uses a provided {@link SilenceSkippingAudioProcessor}
+ * to control silence skipping behavior more precisely.
  *
  * <p>
  * As no ExoPlayer extension is currently used, the reflection code used by ExoPlayer to try to