From 7f72625eacd3efb6e53605e9b3471402edc77850 Mon Sep 17 00:00:00 2001
From: Thodoris Koskinopoulos <me@koskit.me>
Date: Sun, 27 Nov 2022 05:54:29 +0200
Subject: [PATCH] Added blackdetect and blackframe arguments

---
 FFMpegCore/FFMpeg/Arguments/BlackDetectArgument.cs | 14 ++++++++++++++
 FFMpegCore/FFMpeg/Arguments/BlackFrameArgument.cs  | 14 ++++++++++++++
 .../FFMpeg/Arguments/VideoFiltersArgument.cs       |  2 ++
 3 files changed, 30 insertions(+)
 create mode 100644 FFMpegCore/FFMpeg/Arguments/BlackDetectArgument.cs
 create mode 100644 FFMpegCore/FFMpeg/Arguments/BlackFrameArgument.cs

diff --git a/FFMpegCore/FFMpeg/Arguments/BlackDetectArgument.cs b/FFMpegCore/FFMpeg/Arguments/BlackDetectArgument.cs
new file mode 100644
index 0000000..ee088be
--- /dev/null
+++ b/FFMpegCore/FFMpeg/Arguments/BlackDetectArgument.cs
@@ -0,0 +1,14 @@
+namespace FFMpegCore.Arguments
+{
+    public class BlackDetectArgument : IVideoFilterArgument
+    {
+        public string Key => "blackdetect";
+
+        public string Value { get; }
+
+        public BlackDetectArgument(double minimumDuration = 2.0, double pictureBlackRatioThreshold = 0.98, double pixelBlackThreshold = 0.1)
+        {
+            Value = $"d={minimumDuration}:pic_th={pictureBlackRatioThreshold}:pix_th={pixelBlackThreshold}";
+        }
+    }
+}
diff --git a/FFMpegCore/FFMpeg/Arguments/BlackFrameArgument.cs b/FFMpegCore/FFMpeg/Arguments/BlackFrameArgument.cs
new file mode 100644
index 0000000..9d5bad6
--- /dev/null
+++ b/FFMpegCore/FFMpeg/Arguments/BlackFrameArgument.cs
@@ -0,0 +1,14 @@
+namespace FFMpegCore.Arguments
+{
+    internal class BlackFrameArgument : IVideoFilterArgument
+    {
+        public string Key => "blackframe";
+
+        public string Value { get; }
+
+        public BlackFrameArgument(int amount = 98, int threshold = 32)
+        {
+            Value = $"amount={amount}:threshold={threshold}";
+        }
+    }
+}
diff --git a/FFMpegCore/FFMpeg/Arguments/VideoFiltersArgument.cs b/FFMpegCore/FFMpeg/Arguments/VideoFiltersArgument.cs
index 4d0dfde..c49803f 100644
--- a/FFMpegCore/FFMpeg/Arguments/VideoFiltersArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/VideoFiltersArgument.cs
@@ -51,6 +51,8 @@ public class VideoFilterOptions
         public VideoFilterOptions Mirror(Mirroring mirroring) => WithArgument(new SetMirroringArgument(mirroring));
         public VideoFilterOptions DrawText(DrawTextOptions drawTextOptions) => WithArgument(new DrawTextArgument(drawTextOptions));
         public VideoFilterOptions HardBurnSubtitle(SubtitleHardBurnOptions subtitleHardBurnOptions) => WithArgument(new SubtitleHardBurnArgument(subtitleHardBurnOptions));
+        public VideoFilterOptions BlackDetect(double minimumDuration = 2.0, double pictureBlackRatioThreshold = 0.98, double pixelBlackThreshold = 0.1) => WithArgument(new BlackDetectArgument(minimumDuration, pictureBlackRatioThreshold, pixelBlackThreshold));
+        public VideoFilterOptions BlackFrame(int amount = 98, int threshold = 32) => WithArgument(new BlackFrameArgument(amount, threshold));
 
         private VideoFilterOptions WithArgument(IVideoFilterArgument argument)
         {