Added an ffprobe helper class

MediaBrowser.Controller/FFMpeg/FFProbe.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Diagnostics;
+using MediaBrowser.Common.Logging;
+using MediaBrowser.Common.Serialization;
+
+namespace MediaBrowser.Controller.FFMpeg
+{
+    public static class FFProbe
+    {
+        public static FFProbeResult Run(string path)
+        {
+            ProcessStartInfo startInfo = new ProcessStartInfo();
+
+            startInfo.CreateNoWindow = true;
+
+            startInfo.UseShellExecute = false;
+
+            // Must consume both or ffmpeg may hang due to deadlocks. See comments below.
+            startInfo.RedirectStandardOutput = true;
+            startInfo.RedirectStandardError = true;
+
+            startInfo.FileName = Kernel.Instance.ApplicationPaths.FFProbePath;
+            startInfo.WorkingDirectory = Kernel.Instance.ApplicationPaths.FFMpegDirectory;
+            startInfo.Arguments = string.Format("\"{0}\" -v quiet -print_format json -show_streams -show_format", path);
+
+            Logger.LogInfo(startInfo.FileName + " " + startInfo.Arguments);
+
+            Process process = new Process();
+            process.StartInfo = startInfo;
+
+            try
+            {
+                process.Start();
+
+                // MUST read both stdout and stderr asynchronously or a deadlock may occurr
+                // If we ever decide to disable the ffmpeg log then you must uncomment the below line.
+                process.BeginErrorReadLine();
+
+                FFProbeResult result = JsonSerializer.DeserializeFromStream<FFProbeResult>(process.StandardOutput.BaseStream);
+
+                process.WaitForExit();
+
+                Logger.LogInfo("FFMpeg exited with code " + process.ExitCode);
+
+                return result;
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex);
+
+                // Hate having to do this
+                try
+                {
+                    process.Kill();
+                }
+                catch
+                {
+                }
+
+                return null;
+            }
+            finally
+            {
+                process.Dispose();
+            }
+        }
+    }
+}