filter audio streams that don't have any channels

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -227,6 +227,12 @@ namespace MediaBrowser.Api.Playback
                 }
             }
 
+            if (returnFirstIfNoIndex && type == MediaStreamType.Audio)
+            {
+                return streams.FirstOrDefault(i => i.Channels.HasValue && i.Channels.Value > 0) ??
+                       streams.FirstOrDefault();
+            }
+
             // Just return the first one
             return returnFirstIfNoIndex ? streams.FirstOrDefault() : null;
         }