adjust bitrate in h264/h265 conversions

1 files changed, 20 insertions, 0 deletions

diff --git a/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs b/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs
index 8a412ac2c..ed18fed65 100644
--- a/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs
+++ b/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs
@@ -56,5 +56,25 @@ namespace MediaBrowser.Model.Dlna
                 MaxHeight = maxHeight
             };
         }
+
+        private static double GetVideoBitrateScaleFactor(string codec)
+        {
+            if (string.Equals(codec, "h265", StringComparison.OrdinalIgnoreCase) ||
+                string.Equals(codec, "hevc", StringComparison.OrdinalIgnoreCase))
+            {
+                return .5;
+            }
+            return 1;
+        }
+
+        public static int ScaleBitrate(int bitrate, string inputVideoCodec, string outputVideoCodec)
+        {
+            var inputScaleFactor = GetVideoBitrateScaleFactor(inputVideoCodec);
+            var outputScaleFactor = GetVideoBitrateScaleFactor(outputVideoCodec);
+            var scaleFactor = outputScaleFactor/inputScaleFactor;
+            var newBitrate = scaleFactor*bitrate;
+
+            return Convert.ToInt32(newBitrate);
+        }
     }
 }