Added option to use the segment muxer allowing output to file to be segmented. There's a SegmentCustomArgument for the arguments I did not implement.

FFMpegCore.Test/VideoTest.cs

@@ -16,6 +16,22 @@ namespace FFMpegCore.Test
     public class VideoTest
     {
         private const int BaseTimeoutMilliseconds = 15_000;
+        private string _segmentPathSource = "";
+        
+        [TestInitialize]
+        public void Setup()
+        {
+            _segmentPathSource = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}-");
+        }
+
+        [TestCleanup]
+        public void Cleanup()
+        {
+            foreach (var file in Directory.EnumerateFiles(Path.GetDirectoryName(_segmentPathSource), Path.GetFileName(_segmentPathSource) + "*"))
+            {
+                File.Delete(file);
+            }
+        }
 
         [TestMethod, Timeout(BaseTimeoutMilliseconds)]
         public void Video_ToOGV()
@@ -895,5 +911,95 @@ public async Task Video_Cancel_CancellationToken_Async_With_Timeout()
             Assert.AreEqual("h264", outputInfo.PrimaryVideoStream.CodecName);
             Assert.AreEqual("aac", outputInfo.PrimaryAudioStream!.CodecName);
         }
+
+        [TestMethod, Timeout(BaseTimeoutMilliseconds)]
+        public void Video_Segmented_File_Output()
+        {
+            using var input = File.OpenRead(TestResources.WebmVideo);
+            var success = FFMpegArguments
+                .FromPipeInput(new StreamPipeSource(input))
+                .OutPutToSegmentedFiles(
+                        new SegmentArgument($"{_segmentPathSource}%Y-%m-%d_%H-%M-%S.mkv", true, segmentOptions => segmentOptions
+                            .Strftime(true)
+                            .Wrap(-1)
+                            .Time(60)
+                            .ResetTimeStamps(true)),
+                        options => options
+                        .CopyChannel()
+                        .WithVideoCodec("h264")
+                        .ForceFormat("matroska")
+                        .WithConstantRateFactor(21)
+                        .WithVideoBitrate(3000)
+                        .WithFastStart()
+                        .WithVideoFilters(filterOptions => filterOptions
+                            .Scale(VideoSize.Hd)
+                            .DrawText(DrawTextOptions.Create(@"'%{localtime}.%{eif\:1M*t-1K*trunc(t*1K)\:d\:3}'", @"C:/Users/yan.gauthier/AppData/Local/Microsoft/Windows/Fonts/Roboto-Regular.ttf")
+                                .WithParameter("fontcolor", "yellow")
+                                .WithParameter("fontsize", "40")
+                                .WithParameter("x", "(w-text_w)")
+                                .WithParameter("y", "(h - text_h)")
+                                .WithParameter("rate", "19")
+                            )
+                        )
+                    )
+                .CancellableThrough(new CancellationTokenSource().Token, 8000)
+                .ProcessSynchronously(false);
+            Assert.IsTrue(success);
+        }
+
+        [TestMethod, Timeout(BaseTimeoutMilliseconds)]
+        public void Video_MultiOutput_With_Segmented_File_Output()
+        {
+            using var input = File.OpenRead(TestResources.WebmVideo);
+            var success = FFMpegArguments
+                .FromPipeInput(new StreamPipeSource(input))
+                .MultiOutput(args => args
+                   .OutputToFile($"{_segmentPathSource}2", true, options => options
+                        .CopyChannel()
+                        .WithVideoCodec("mjpeg")
+                        .ForceFormat("matroska")
+                        .WithConstantRateFactor(21)
+                        .WithVideoBitrate(4000)
+                        .WithFastStart()
+                        .WithVideoFilters(filterOptions => filterOptions
+                            .Scale(VideoSize.Hd)
+                            .DrawText(DrawTextOptions.Create(@"'%{localtime}.%{eif\:1M*t-1K*trunc(t*1K)\:d\:3}'", @"C:/Users/yan.gauthier/AppData/Local/Microsoft/Windows/Fonts/Roboto-Regular.ttf")
+                                .WithParameter("fontcolor", "yellow")
+                                .WithParameter("fontsize", "40")
+                                .WithParameter("x", "(w-text_w)")
+                                .WithParameter("y", "(h - text_h)")
+                                .WithParameter("rate", "19")
+                            )
+                        )
+                    )
+                   .OutPutToSegmentedFiles(
+                        new SegmentArgument($"{_segmentPathSource}%Y-%m-%d_%H-%M-%S.mkv", true, segmentOptions => segmentOptions
+                            .Strftime(true)
+                            .Wrap(-1)
+                            .Time(60)
+                            .ResetTimeStamps(true)),
+                        options => options
+                        .CopyChannel()
+                        .WithVideoCodec("h264")
+                        .ForceFormat("matroska")
+                        .WithConstantRateFactor(21)
+                        .WithVideoBitrate(3000)
+                        .WithFastStart()
+                        .WithVideoFilters(filterOptions => filterOptions
+                            .Scale(VideoSize.Hd)
+                            .DrawText(DrawTextOptions.Create(@"'%{localtime}.%{eif\:1M*t-1K*trunc(t*1K)\:d\:3}'", @"C:/Users/yan.gauthier/AppData/Local/Microsoft/Windows/Fonts/Roboto-Regular.ttf")
+                                .WithParameter("fontcolor", "yellow")
+                                .WithParameter("fontsize", "40")
+                                .WithParameter("x", "(w-text_w)")
+                                .WithParameter("y", "(h - text_h)")
+                                .WithParameter("rate", "19")
+                            )
+                        )
+                    )
+                )
+                .CancellableThrough(new CancellationTokenSource().Token, 8000)
+                .ProcessSynchronously(false);
+            Assert.IsTrue(success);
+        }
     }
 }

FFMpegCore/FFMpeg/Arguments/OutputSegmentArgument.cs

@@ -0,0 +1,92 @@
+using FFMpegCore.Exceptions;
+
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Represents output parameter
+    /// </summary>
+    public class OutputSegmentArgument : IOutputArgument
+    {
+        public readonly string SegmentPattern;
+        public readonly bool Overwrite;
+        public readonly SegmentArgumentOptions Options;
+
+        public OutputSegmentArgument(SegmentArgument segmentArgument)
+        {
+            SegmentPattern = segmentArgument.SegmentPattern;
+            Overwrite = segmentArgument.Overwrite;
+
+            var segmentArgumentobj = new SegmentArgumentOptions();
+            segmentArgument.Options?.Invoke(segmentArgumentobj);
+            Options = segmentArgumentobj;
+        }
+
+        public void Pre()
+        {
+            if (int.TryParse(Options.Arguments.FirstOrDefault(x => x.Key == "segment_time").Value, out var result) && result < 1)
+            { 
+                throw new FFMpegException(FFMpegExceptionType.Process, "Parameter SegmentTime cannot be negative or equal to zero"); 
+            }
+
+            if (Options.Arguments.FirstOrDefault(x => x.Key == "segment_time").Value == "0")
+
+            {
+                throw new FFMpegException(FFMpegExceptionType.Process, "Parameter SegmentWrap cannot equal to zero");
+            }
+        }
+        public Task During(CancellationToken cancellationToken = default) => Task.CompletedTask;
+        public void Post()
+        {
+        }
+
+        public string Text => GetText();
+
+        private string GetText()
+        {
+            var arguments = Options.Arguments
+                .Where(arg => !string.IsNullOrWhiteSpace(arg.Value) && !string.IsNullOrWhiteSpace(arg.Key))
+                .Select(arg =>
+                {
+                    return arg.Value;
+                });
+
+            return $"-f segment {string.Join(" ", arguments)} \"{SegmentPattern}\"{(Overwrite ? " -y" : string.Empty)}";
+        }
+    }
+
+    public interface ISegmentArgument
+    {
+        public string Key { get; }
+        public string Value { get; }
+    }
+
+    public class SegmentArgumentOptions
+    {
+        public List<ISegmentArgument> Arguments { get; } = new();
+
+        public SegmentArgumentOptions ResetTimeStamps(bool resetTimestamps = true) => WithArgument(new SegmentResetTimeStampsArgument(resetTimestamps));
+        public SegmentArgumentOptions Strftime(bool enable = false) => WithArgument(new SegmentStrftimeArgument(enable));
+        public SegmentArgumentOptions Time(int time = 60) => WithArgument(new SegmentTimeArgument(time));
+        public SegmentArgumentOptions Wrap(int limit = -1) => WithArgument(new SegmentWrapArgument(limit));
+        public SegmentArgumentOptions WithCustomArgument(string argument) => WithArgument(new SegmentCustomArgument(argument));
+        private SegmentArgumentOptions WithArgument(ISegmentArgument argument)
+        {
+            Arguments.Add(argument);
+            return this;
+        }
+    }
+
+    public class SegmentArgument
+    {
+        public readonly string SegmentPattern;
+        public readonly bool Overwrite;
+        public readonly Action<SegmentArgumentOptions> Options;
+
+        public SegmentArgument(string segmentPattern, bool overwrite,  Action<SegmentArgumentOptions> options)
+        {
+            SegmentPattern = segmentPattern;
+            Overwrite = overwrite;
+            Options = options;
+        }
+    }
+}

FFMpegCore/FFMpeg/Arguments/SegmentCustomArgument.cs

@@ -0,0 +1,14 @@
+namespace FFMpegCore.Arguments
+{
+    public class SegmentCustomArgument : ISegmentArgument
+    {
+        public readonly string Argument;
+
+        public SegmentCustomArgument(string argument)
+        {
+            Argument = argument;
+        }
+        public string Key => "custom";
+        public string Value => Argument ?? string.Empty;
+    }
+}

FFMpegCore/FFMpeg/Arguments/SegmentResetTimestampsArgument.cs

@@ -0,0 +1,20 @@
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Represents reset_timestamps parameter
+    /// </summary>
+    public class SegmentResetTimeStampsArgument : ISegmentArgument
+    {
+        public readonly bool ResetTimestamps;
+        /// <summary>
+        /// Represents reset_timestamps parameter
+        /// </summary>
+        /// <param name="resetTimestamps">true if files timestamps are to be reset</param>
+        public SegmentResetTimeStampsArgument(bool resetTimestamps)
+        {
+            ResetTimestamps = resetTimestamps;
+        }
+        public string Key { get; } = "reset_timestamps";
+        public string Value => ResetTimestamps ? $"-reset_timestamps 1" : string.Empty;
+    }
+}

FFMpegCore/FFMpeg/Arguments/SegmentStrftimeArgument.cs

@@ -0,0 +1,20 @@
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Use the strftime function to define the name of the new segments to write. If this is selected, the output segment name must contain a strftime function template. Default value is 0.
+    /// </summary>
+    public class SegmentStrftimeArgument : ISegmentArgument
+    {
+        public readonly bool Enable;
+        /// <summary>
+        /// Use the strftime function to define the name of the new segments to write. If this is selected, the output segment name must contain a strftime function template. Default value is 0.
+        /// </summary>
+        /// <param name="enable">true to enable strftime</param>
+        public SegmentStrftimeArgument(bool enable)
+        {
+            Enable = enable;
+        }
+        public string Key { get; } = "strftime";
+        public string Value => Enable ? $"-strftime 1" : string.Empty;
+    }
+}

FFMpegCore/FFMpeg/Arguments/SegmentTimeArgument.cs

@@ -0,0 +1,20 @@
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Represents segment_time parameter
+    /// </summary>
+    public class SegmentTimeArgument : ISegmentArgument
+    {
+        public readonly int Time;
+        /// <summary>
+        /// Represents segment_time parameter
+        /// </summary>
+        /// <param name="time">time in seconds of the segment</param>
+        public SegmentTimeArgument(int time)
+        {
+            Time = time;
+        }
+        public string Key { get; } = "segment_time";
+        public string Value => Time <= 0 ? string.Empty : $"-segment_time {Time}";
+    }
+}

FFMpegCore/FFMpeg/Arguments/SegmentWrapArgument.cs

@@ -0,0 +1,20 @@
+namespace FFMpegCore.Arguments
+{
+    /// <summary>
+    /// Represents segment_wrap parameter
+    /// </summary>
+    public class SegmentWrapArgument : ISegmentArgument
+    {
+        public readonly int Limit;
+        /// <summary>
+        /// Represents segment_wrap parameter
+        /// </summary>
+        /// <param name="limit">limit value after which segment index will wrap around</param>
+        public SegmentWrapArgument(int limit)
+        {
+            Limit = limit;
+        }
+        public string Key { get; } = "segment_wrap";
+        public string Value => Limit <= 0 ? string.Empty : $"-segment_wrap {Limit}";
+    }
+}

FFMpegCore/FFMpeg/FFMpegArguments.cs

@@ -61,7 +61,7 @@ private FFMpegArguments WithInput(IInputArgument inputArgument, Action<FFMpegArg
         public FFMpegArgumentProcessor OutputToUrl(string uri, Action<FFMpegArgumentOptions>? addArguments = null) => ToProcessor(new OutputUrlArgument(uri), addArguments);
         public FFMpegArgumentProcessor OutputToUrl(Uri uri, Action<FFMpegArgumentOptions>? addArguments = null) => ToProcessor(new OutputUrlArgument(uri.ToString()), addArguments);
         public FFMpegArgumentProcessor OutputToPipe(IPipeSink reader, Action<FFMpegArgumentOptions>? addArguments = null) => ToProcessor(new OutputPipeArgument(reader), addArguments);
-
+        public FFMpegArgumentProcessor OutPutToSegmentedFiles(SegmentArgument segmentArgument, Action<FFMpegArgumentOptions>? addArguments = null) => ToProcessor(new OutputSegmentArgument(segmentArgument), addArguments);
         private FFMpegArgumentProcessor ToProcessor(IOutputArgument argument, Action<FFMpegArgumentOptions>? addArguments)
         {
             var args = new FFMpegArgumentOptions();

FFMpegCore/FFMpeg/FFMpegMultiOutputOptions.cs

@@ -16,7 +16,7 @@ public class FFMpegMultiOutputOptions
         public FFMpegMultiOutputOptions OutputToUrl(Uri uri, Action<FFMpegArgumentOptions>? addArguments = null) => AddOutput(new OutputUrlArgument(uri.ToString()), addArguments);
 
         public FFMpegMultiOutputOptions OutputToPipe(IPipeSink reader, Action<FFMpegArgumentOptions>? addArguments = null) => AddOutput(new OutputPipeArgument(reader), addArguments);
-
+        public FFMpegMultiOutputOptions OutPutToSegmentedFiles(SegmentArgument segmentArgument, Action<FFMpegArgumentOptions>? addArguments = null) => AddOutput(new OutputSegmentArgument(segmentArgument), addArguments);
         public FFMpegMultiOutputOptions AddOutput(IOutputArgument argument, Action<FFMpegArgumentOptions>? addArguments)
         {
             var args = new FFMpegArgumentOptions();