Don't invoke adaptiveTrack with 0 or 1 representations.

0 will crash. 1 is pointless.

library/src/main/java/com/google/android/exoplayer/dash/DefaultDashTrackSelector.java

@@ -84,8 +84,11 @@ public final class DefaultDashTrackSelector implements DashTrackSelector {
           } else {
           } else {
             representations = Util.firstIntegersArray(adaptationSet.representations.size());
             representations = Util.firstIntegersArray(adaptationSet.representations.size());
           }
           }
-          output.adaptiveTrack(manifest, periodIndex, i, representations);
-          for (int j = 0; j < representations.length; j++) {
+          int representationCount = representations.length;
+          if (representationCount > 1) {
+            output.adaptiveTrack(manifest, periodIndex, i, representations);
+          }
+          for (int j = 0; j < representationCount; j++) {
             output.fixedTrack(manifest, periodIndex, i, representations[j]);
             output.fixedTrack(manifest, periodIndex, i, representations[j]);
           }
           }
         } else {
         } else {

library/src/main/java/com/google/android/exoplayer/smoothstreaming/DefaultSmoothStreamingTrackSelector.java

@@ -50,8 +50,11 @@ public final class DefaultSmoothStreamingTrackSelector implements SmoothStreamin
         if (streamElementType == StreamElement.TYPE_VIDEO) {
         if (streamElementType == StreamElement.TYPE_VIDEO) {
           int[] trackIndices = VideoFormatSelectorUtil.selectVideoFormatsForDefaultDisplay(
           int[] trackIndices = VideoFormatSelectorUtil.selectVideoFormatsForDefaultDisplay(
               context, Arrays.asList(manifest.streamElements[i].tracks), null, false);
               context, Arrays.asList(manifest.streamElements[i].tracks), null, false);
-          output.adaptiveTrack(manifest, i, trackIndices);
-          for (int j = 0; j < trackIndices.length; j++) {
+          int trackCount = trackIndices.length;
+          if (trackCount > 1) {
+            output.adaptiveTrack(manifest, i, trackIndices);
+          }
+          for (int j = 0; j < trackCount; j++) {
             output.fixedTrack(manifest, i, trackIndices[j]);
             output.fixedTrack(manifest, i, trackIndices[j]);
           }
           }
         } else {
         } else {