support avisynth portable

Changelog.md

@@ -3,6 +3,7 @@
 ============
 
 - log error fix
+- workaround to support AviSynth portable (ffmpeg blocks loading AviSynth from path env var)
 
 
 5.4.6.0

mpv.net/WPF/LearnWindow.xaml.cs

@@ -386,4 +386,4 @@ namespace mpvnet
             KeyChar = e.Text;
         }
     }
-}
+}

mpv.net/mpv/Core.cs

@@ -974,6 +974,7 @@ namespace mpvnet
             for (int i = 0; i < files.Length; i++)
             {
                 string file = files[i];
+                LoadLibrary(file.ShortExt());
 
                 if (App.SubtitleTypes.Contains(file.ShortExt()))
                     commandv("sub-add", file);
@@ -1020,6 +1021,17 @@ namespace mpvnet
                 commandv("playlist-move", "0", (index + 1).ToString());
         }
 
+        bool wasAviSynthLoaded;
+
+        void LoadLibrary(string ext)
+        {
+            if (!wasAviSynthLoaded && ext == "avs")
+            {
+                WinAPI.LoadLibrary("AviSynth.dll");
+                wasAviSynthLoaded = true;
+            }
+        }
+
         string LastHistoryPath;
         DateTime LastHistoryStartDateTime;