2 files changed, 47 insertions, 53 deletions

diff --git a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
index a450097fd..24de4e77e 100644
--- a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
@@ -26,6 +26,30 @@ namespace MediaBrowser.MediaEncoding.Encoder
             return new Tuple<List<string>, List<string>>(decoders, encoders);
         }
 
+        public bool ValidateVersion(string encoderAppPath)
+        {
+            string output = string.Empty;
+            try
+            {
+                output = GetProcessOutput(encoderAppPath, "-version");
+            }
+            catch
+            {
+            }
+
+            if (string.IsNullOrWhiteSpace(output))
+            {
+                return false;
+            }
+
+            if (output.IndexOf("Libav developers", StringComparison.OrdinalIgnoreCase) != -1)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
         private List<string> GetDecoders(string encoderAppPath)
         {
             string output = string.Empty;
diff --git a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
index a2707aace..d3131eb5a 100644
--- a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
@@ -82,6 +82,8 @@ namespace MediaBrowser.MediaEncoding.Encoder
 
         private readonly List<ProcessWrapper> _runningProcesses = new List<ProcessWrapper>();
         private readonly bool _hasExternalEncoder;
+        private string _originalFFMpegPath;
+        private string _originalFFProbePath;
 
         public MediaEncoder(ILogger logger, IJsonSerializer jsonSerializer, string ffMpegPath, string ffProbePath, bool hasExternalEncoder, IServerConfigurationManager configurationManager, IFileSystem fileSystem, ILiveTvManager liveTvManager, IIsoManager isoManager, ILibraryManager libraryManager, IChannelManager channelManager, ISessionManager sessionManager, Func<ISubtitleEncoder> subtitleEncoder, Func<IMediaSourceManager> mediaSourceManager, IHttpClient httpClient, IZipClient zipClient)
         {
@@ -100,6 +102,8 @@ namespace MediaBrowser.MediaEncoding.Encoder
             _zipClient = zipClient;
             FFProbePath = ffProbePath;
             FFMpegPath = ffMpegPath;
+            _originalFFProbePath = ffProbePath;
+            _originalFFMpegPath = ffMpegPath;
 
             _hasExternalEncoder = hasExternalEncoder;
         }
@@ -108,11 +112,6 @@ namespace MediaBrowser.MediaEncoding.Encoder
         {
             get
             {
-                if (_hasExternalEncoder)
-                {
-                    return "External";
-                }
-
                 if (string.IsNullOrWhiteSpace(FFMpegPath))
                 {
                     return null;
@@ -177,12 +176,6 @@ namespace MediaBrowser.MediaEncoding.Encoder
         {
             ConfigureEncoderPaths();
 
-            if (_hasExternalEncoder)
-            {
-                LogPaths();
-                return;
-            }
-
             // If the path was passed in, save it into config now.
             var encodingOptions = GetEncodingOptions();
             var appPath = encodingOptions.EncoderAppPath;
@@ -207,11 +200,6 @@ namespace MediaBrowser.MediaEncoding.Encoder
 
         public async Task UpdateEncoderPath(string path, string pathType)
         {
-            if (_hasExternalEncoder)
-            {
-                return;
-            }
-
             Tuple<string, string> newPaths;
 
             if (string.Equals(pathType, "system", StringComparison.OrdinalIgnoreCase))
@@ -247,6 +235,11 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 throw new ResourceNotFoundException("ffprobe not found");
             }
 
+            if (!ValidateVersion(path))
+            {
+                throw new ResourceNotFoundException("ffmpeg version 3.0 or greater is required.");
+            }
+
             var config = GetEncodingOptions();
             config.EncoderAppPath = path;
             ConfigurationManager.SaveConfiguration("encoding", config);
@@ -254,13 +247,13 @@ namespace MediaBrowser.MediaEncoding.Encoder
             Init();
         }
 
-        private void ConfigureEncoderPaths()
+        private bool ValidateVersion(string path)
         {
-            if (_hasExternalEncoder)
-            {
-                return;
-            }
+            return new EncoderValidator(_logger).ValidateVersion(path);
+        }
 
+        private void ConfigureEncoderPaths()
+        {
             var appPath = GetEncodingOptions().EncoderAppPath;
 
             if (string.IsNullOrWhiteSpace(appPath))
@@ -308,45 +301,22 @@ namespace MediaBrowser.MediaEncoding.Encoder
             string encoderPath = null;
             string probePath = null;
 
-            if (TestSystemInstalled("ffmpeg"))
-            {
-                encoderPath = "ffmpeg";
-            }
-            if (TestSystemInstalled("ffprobe"))
+            if (_hasExternalEncoder && ValidateVersion(_originalFFMpegPath))
             {
-                probePath = "ffprobe";
+                encoderPath = _originalFFMpegPath;
+                probePath = _originalFFProbePath;
             }
 
-            return new Tuple<string, string>(encoderPath, probePath);
-        }
-
-        private bool TestSystemInstalled(string app)
-        {
-            try
+            if (string.IsNullOrWhiteSpace(encoderPath))
             {
-                var startInfo = new ProcessStartInfo
+                if (ValidateVersion("ffmpeg") && ValidateVersion("ffprobe"))
                 {
-                    FileName = app,
-                    Arguments = "-v",
-                    UseShellExecute = false,
-                    CreateNoWindow = true,
-                    WindowStyle = ProcessWindowStyle.Hidden,
-                    ErrorDialog = false
-                };
-
-                using (var process = Process.Start(startInfo))
-                {
-                    process.WaitForExit();
+                    encoderPath = "ffmpeg";
+                    probePath = "ffprobe";
                 }
-
-                _logger.Debug("System app installed: " + app);
-                return true;
-            }
-            catch
-            {
-                _logger.Debug("System app not installed: " + app);
-                return false;
             }
+
+            return new Tuple<string, string>(encoderPath, probePath);
         }
 
         private Tuple<string, string> GetPathsFromDirectory(string path)