Fixed: Format Errors from AudioChannel formatter

Fixes RADARR-8

src/NzbDrone.Core.Test/MediaFiles/MediaInfo/MediaInfoFormatterTests/FormatAudioChannelsFixture.cs

@@ -1,3 +1,5 @@
+using System.Globalization;
+using System.Threading;
 using FluentAssertions;
 using NUnit.Framework;
 using NzbDrone.Core.MediaFiles.MediaInfo;
@@ -90,6 +92,22 @@ namespace NzbDrone.Core.Test.MediaFiles.MediaInfo.MediaInfoFormatterTests
             MediaInfoFormatter.FormatAudioChannels(mediaInfoModel).Should().Be(5.1m);
         }
 
+        [Test]
+        public void should_ignore_culture_on_channel_summary()
+        {
+            Thread.CurrentThread.CurrentCulture = new CultureInfo("fr-FR");
+
+            var mediaInfoModel = new MediaInfoModel
+            {
+                AudioChannels = 2,
+                AudioChannelPositions = "3/2/0.1",
+                AudioChannelPositionsText = null,
+                SchemaRevision = 3
+            };
+
+            MediaInfoFormatter.FormatAudioChannels(mediaInfoModel).Should().Be(5.1m);
+        }
+
         [Test]
         public void should_handle_AudioChannelPositions_three_digits()
         {

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

@@ -494,11 +494,11 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
 
                         if (channelSplit.Count() == 3)
                         {
-                            positions += decimal.Parse(string.Format("{0}.{1}", channelSplit[1], channelSplit[2]));
+                            positions += decimal.Parse(string.Format("{0}.{1}", channelSplit[1], channelSplit[2]), CultureInfo.InvariantCulture);
                         }
                         else
                         {
-                            positions += decimal.Parse(channel);
+                            positions += decimal.Parse(channel, CultureInfo.InvariantCulture);
                         }
                     }