Add disable channel argument cases for subtitle and data streams

FFMpegCore.Test/ArgumentBuilderTest.cs

@@ -1,6 +1,7 @@
 using System.Drawing;
 using FFMpegCore.Arguments;
 using FFMpegCore.Enums;
+using FFMpegCore.Exceptions;
 using FFMpegCore.Pipes;
 
 namespace FFMpegCore.Test;
@@ -141,6 +142,62 @@ public void Builder_BuildString_DisableChannel_Video()
         Assert.AreEqual("-i \"input.mp4\" -vn \"output.mp4\"", str);
     }
 
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_Subtitle()
+    {
+        var str = FFMpegArguments.FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.Subtitle)).Arguments;
+        Assert.AreEqual("-i \"input.mp4\" -sn \"output.mp4\"", str);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_Data()
+    {
+        var str = FFMpegArguments.FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.Data)).Arguments;
+        Assert.AreEqual("-i \"input.mp4\" -dn \"output.mp4\"", str);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_Multiple()
+    {
+        var str = FFMpegArguments.FromFileInput("input.mp4")
+        .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.Audio).DisableChannel(Channel.Video)).Arguments;
+        Assert.AreEqual("-i \"input.mp4\" -an -vn \"output.mp4\"", str);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_Both_InvalidChannel()
+    {
+        Assert.ThrowsExactly<FFMpegException>(() => FFMpegArguments
+            .FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.Both)).Arguments);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_All_InvalidChannel()
+    {
+        Assert.ThrowsExactly<FFMpegException>(() => FFMpegArguments
+            .FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.All)).Arguments);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_Attachments_UnsupportedChannel()
+    {
+        Assert.ThrowsExactly<FFMpegException>(() => FFMpegArguments
+            .FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.Attachments)).Arguments);
+    }
+
+    [TestMethod]
+    public void Builder_BuildString_DisableChannel_VideoNoAttachedPic_UnsupportedChannel()
+    {
+        Assert.ThrowsExactly<FFMpegException>(() => FFMpegArguments
+            .FromFileInput("input.mp4")
+            .OutputToFile("output.mp4", false, opt => opt.DisableChannel(Channel.VideoNoAttachedPic)).Arguments);
+    }
+
     [TestMethod]
     public void Builder_BuildString_AudioSamplingRate_Default()
     {

FFMpegCore/FFMpeg/Arguments/DisableChannelArgument.cs

@@ -4,17 +4,35 @@
 namespace FFMpegCore.Arguments;
 
 /// <summary>
-///     Represents cpu speed parameter
+///     Represents channel disabling parameter
+///     Used to disable processing of all streams of a particular type so that they are not filtered, automatically selected or mapped for any input or output
 /// </summary>
 public class DisableChannelArgument : IArgument
 {
     public readonly Channel Channel;
 
     public DisableChannelArgument(Channel channel)
     {
+        if (channel == Channel.All)
+        {
+            throw new FFMpegException(FFMpegExceptionType.Conversion, "Cannot disable all channels");
+        }
+
         if (channel == Channel.Both)
         {
-            throw new FFMpegException(FFMpegExceptionType.Conversion, "Cannot disable both channels");
+            throw new FFMpegException(FFMpegExceptionType.Conversion, "Cannot disable both video and audio channels at once");
+        }
+
+        if (channel == Channel.Attachments)
+        {
+            // ffmpeg does not support disabling attachment streams
+            throw new FFMpegException(FFMpegExceptionType.Operation, $"{nameof(Channel.Attachments)} channel cannot be disabled");
+        }
+
+        if (channel == Channel.VideoNoAttachedPic)
+        {
+            // ffmpeg does not support disabling no-picture-filtered video steams
+            throw new FFMpegException(FFMpegExceptionType.Operation, $"{nameof(Channel.VideoNoAttachedPic)} channel cannot be disabled");
         }
 
         Channel = channel;
@@ -24,6 +42,8 @@ public DisableChannelArgument(Channel channel)
     {
         Channel.Video => "-vn",
         Channel.Audio => "-an",
+        Channel.Subtitle => "-sn",
+        Channel.Data => "-dn",
         _ => string.Empty
     };
 }