fix nvidia color normalization (#1314)

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Skip checking for subtitles to extract when subtitles are not enabled on a channel/schedule item
 - Properly scale subtitles when using hardware acceleration
+- Fix color normalization of content with missing color metadata when using NVIDIA acceleration
 
 ### Changed
 - `HLS Direct` streaming mode

ErsatzTV.FFmpeg/ColorParams.cs

@@ -12,7 +12,8 @@ public record ColorParams(string ColorRange, string ColorSpace, string ColorTran
                              string.IsNullOrWhiteSpace(ColorTransfer) &&
                              string.IsNullOrWhiteSpace(ColorPrimaries);
 
-    public bool IsMixed => ColorSpace != ColorTransfer || ColorTransfer != ColorPrimaries;
+    public bool IsMixed => ColorSpace != ColorTransfer || ColorTransfer != ColorPrimaries ||
+                           string.IsNullOrWhiteSpace(ColorRange);
 
     public bool IsBt709
     {