Improve ffprobe exceptions

Former-commit-id: 27fb37700c

FFMpegCore/FFProbe/Exceptions/FFProbeException.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace FFMpegCore.Exceptions
+{
+    public class FFProbeException : Exception
+    {
+        public FFProbeException(string message, Exception? inner = null) : base(message, inner)
+        {
+        }
+    }
+}

FFMpegCore/FFProbe/Exceptions/FFProbeProcessException.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+
+namespace FFMpegCore.Exceptions
+{
+    public class FFProbeProcessException : FFProbeException
+    {
+        public IReadOnlyCollection<string> ProcessErrors { get; }
+
+        public FFProbeProcessException(string message, IReadOnlyCollection<string> processErrors, Exception? inner = null) : base(message, inner)
+        {
+            ProcessErrors = processErrors;
+        }
+    }
+}

FFMpegCore/FFProbe/Exceptions/FormatNullException.cs

@@ -0,0 +1,9 @@
+namespace FFMpegCore.Exceptions
+{
+    public class FormatNullException : FFProbeException
+    {
+        public FormatNullException() : base("Format not specified")
+        {
+        }
+    }
+}

FFMpegCore/FFProbe/FFProbe.cs

@@ -93,7 +93,7 @@ public static async Task<IMediaAnalysis> AnalyseAsync(Stream stream, int outputC
             }
             var exitCode = await task.ConfigureAwait(false);
             if (exitCode != 0)
-                throw new FFMpegException(FFMpegExceptionType.Process, $"FFProbe process returned exit status {exitCode}", null, string.Join("\n", instance.ErrorData));
+                throw new FFProbeProcessException($"ffprobe exited with non-zero exit-code ({exitCode} - {string.Join("\n", instance.ErrorData)})", instance.ErrorData);
             
             pipeArgument.Post();
             return ParseOutput(instance);
@@ -108,7 +108,7 @@ private static IMediaAnalysis ParseOutput(Instance instance)
             });
             
             if (ffprobeAnalysis?.Format == null)
-                throw new Exception();
+                throw new FormatNullException();
             
             return new MediaAnalysis(ffprobeAnalysis);
         }
@@ -123,8 +123,7 @@ private static Instance PrepareInstance(string filePath, int outputCapacity, FFO
                 StandardOutputEncoding = ffOptions.Encoding,
                 StandardErrorEncoding = ffOptions.Encoding
             };
-            var instance = new Instance(startInfo)
-                { DataBufferCapacity = outputCapacity };
+            var instance = new Instance(startInfo) { DataBufferCapacity = outputCapacity };
             return instance;
         }
     }

FFMpegCore/Helpers/FFProbeHelper.cs

@@ -30,7 +30,7 @@ public static void VerifyFFProbeExists(FFOptions ffMpegOptions)
             var (exitCode, _) = Instance.Finish(GlobalFFOptions.GetFFProbeBinaryPath(ffMpegOptions), "-version");
             _ffprobeVerified = exitCode == 0;
             if (!_ffprobeVerified) 
-                throw new FFMpegException(FFMpegExceptionType.Operation, "ffprobe was not found on your system");
+                throw new FFProbeException("ffprobe was not found on your system");
         }
     }
 }