Fix error with weirdly formatted audioChannelPositions on MediaInfo.

src/NzbDrone.Core.Test/MediaFiles/MediaInfo/VideoFileInfoReaderFixture.cs

@@ -100,5 +100,23 @@ namespace NzbDrone.Core.Test.MediaFiles.MediaInfo
 
             stream.Close();
         }
+
+		[Test]
+		[TestCase("/ Front: L R", 2.0)]
+		public void should_correctly_read_audio_channels(string ChannelPositions, decimal formattedChannels)
+		{
+			var info = new MediaInfoModel()
+			{
+				VideoCodec = "AVC",
+				AudioFormat = "DTS",
+				AudioLanguages = "English",
+				Subtitles = "English",
+				AudioChannels = 2,
+				AudioChannelPositions = ChannelPositions,
+				SchemaRevision = 3,
+			};
+
+			info.FormattedAudioChannels.Should().Be(formattedChannels);
+		}
     }
 }

src/NzbDrone.Core/MediaFiles/MediaInfo/MediaInfoModel.cs

@@ -34,8 +34,18 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
         {
             get
             {
-                if (AudioChannelPositions.IsNullOrWhiteSpace())
+				try
 				{
+					return
+					AudioChannelPositions.Replace("Object Based /", "").Replace(" / ", "$")
+						.Split('$')
+						.First()
+						.Split('/')
+						.Sum(s => decimal.Parse(s, CultureInfo.InvariantCulture));
+				}
+				catch
+				{
+
 						if (AudioChannelPositionsText.IsNullOrWhiteSpace())
 						{
 							if (SchemaRevision >= 3)
@@ -47,14 +57,10 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
 						}
 
 						return AudioChannelPositionsText.ContainsIgnoreCase("LFE") ? AudioChannels - 1 + 0.1m : AudioChannels;
+
+
 				}
 
-                return
-                    AudioChannelPositions.Replace("Object Based /", "").Replace(" / ", "$")
-                        .Split('$')
-                        .First()
-                        .Split('/')
-                        .Sum(s => decimal.Parse(s, CultureInfo.InvariantCulture));
             }
         }
     }