From 4e5d464753659206d42394e8a41e2b4acc30a137 Mon Sep 17 00:00:00 2001
From: Malte Rosenbjerg <rosenbjerg@users.noreply.github.com>
Date: Tue, 16 Jun 2020 07:42:35 +0200
Subject: [PATCH] Add demux concat

---
 .../FFMpeg/Arguments/DemuxConcatArgument.cs   | 32 +++++++++++++++++++
 FFMpegCore/FFMpeg/FFMpegArguments.cs          |  1 +
 2 files changed, 33 insertions(+)
 create mode 100644 FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs

diff --git a/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs b/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs
new file mode 100644
index 0000000..2570db8
--- /dev/null
+++ b/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Represents parameter of concat argument
+    /// Used for creating video from multiple images or videos
+    /// </summary>
+    public class DemuxConcatArgument : IInputArgument
+    {
+        public readonly IEnumerable<string> Values;
+        public DemuxConcatArgument(IEnumerable<string> values)
+        {
+            Values = values;
+        }
+        private readonly string _tempFileName = Path.Combine(FFMpegOptions.Options.TempDirectory, Guid.NewGuid() + ".txt");
+
+        public void Pre()
+        {
+            File.WriteAllLines(_tempFileName, Values);
+        }
+
+        public void Post()
+        {
+            File.Delete(_tempFileName);
+        }
+
+        public string Text => $"-f concat -safe 0 -i \"{_tempFileName}\"";
+    }
+}
\ No newline at end of file
diff --git a/FFMpegCore/FFMpeg/FFMpegArguments.cs b/FFMpegCore/FFMpeg/FFMpegArguments.cs
index 40e72c7..d3b900c 100644
--- a/FFMpegCore/FFMpeg/FFMpegArguments.cs
+++ b/FFMpegCore/FFMpeg/FFMpegArguments.cs
@@ -32,6 +32,7 @@ private FFMpegArguments(IInputArgument inputArgument)
         public static FFMpegArguments FromInputFiles(params FileInfo[] files) => new FFMpegArguments(new InputArgument(false, files));
         public static FFMpegArguments FromInputFiles(bool verifyExists, params FileInfo[] files) => new FFMpegArguments(new InputArgument(verifyExists, files));
         public static FFMpegArguments FromConcatenation(params string[] files) => new FFMpegArguments(new ConcatArgument(files));
+        public static FFMpegArguments FromDemuxConcatenation(params string[] files) => new FFMpegArguments(new ConcatArgument(files));
         public static FFMpegArguments FromPipe(IPipeSource writer) => new FFMpegArguments(new InputPipeArgument(writer));