fix bt470bg color normalization using qsv (#1230)

CHANGELOG.md

@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix bug where local libraries would merge with media server libraries when the same file was added to both libraries
 - Fix transcoding some 10-bit content from media servers using VAAPI acceleration
 - Fix decoding of MPEG-4 Part 2 (e.g. DivX) content using NVIDIA acceleration
+- Fix color normalization from `bt470bg` to `bt709` using QSV acceleration
 
 ### Changed
 - Use Poster artwork for XMLTV if available

ErsatzTV.FFmpeg/Filter/ColorspaceFilter.cs

@@ -72,8 +72,8 @@ public class ColorspaceFilter : BaseFilter
             {
                 return _desiredPixelFormat.BitDepth switch
                 {
-                    10 => $"{hwdownload}colormatrix=dst=bt709,format=yuv420p10",
-                    8 => $"{hwdownload}colormatrix=dst=bt709,format=yuv420p",
+                    10 => $"{hwdownload}colormatrix=src=bt470bg:dst=bt709,format=yuv420p10",
+                    8 => $"{hwdownload}colormatrix=src=bt470bg:dst=bt709,format=yuv420p",
                     _ => string.Empty
                 };
             }