Use the right overload of createAudioFormat in Ac3Util.

library/src/main/java/com/google/android/exoplayer/util/Ac3Util.java

@@ -51,7 +51,7 @@ public final class Ac3Util {
       channelCount++;
     }
     return MediaFormat.createAudioFormat(MimeTypes.AUDIO_AC3, MediaFormat.NO_VALUE,
-        MediaFormat.NO_VALUE, channelCount, sampleRate, Collections.<byte[]>emptyList());
+        channelCount, sampleRate, Collections.<byte[]>emptyList());
   }
 
   /**
@@ -102,7 +102,7 @@ public final class Ac3Util {
     }
     boolean lfeon = data.readBit();
     return MediaFormat.createAudioFormat(MimeTypes.AUDIO_AC3, MediaFormat.NO_VALUE,
-        MediaFormat.NO_VALUE, CHANNEL_COUNTS[acmod] + (lfeon ? 1 : 0), SAMPLE_RATES[fscod],
+        CHANNEL_COUNTS[acmod] + (lfeon ? 1 : 0), SAMPLE_RATES[fscod],
         Collections.<byte[]>emptyList());
   }