diff --git a/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs b/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
index 29ae5278..35a7a770 100644
--- a/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
+++ b/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
@@ -190,8 +190,6 @@ namespace Vocaluxe.Lib.Video.Acinerella
 #endif
 #endif
 
-        private static readonly Object _Lock = new Object();
-
         // Defines the type of an Acinerella media stream. Currently only video and
         // audio streams are supported, subtitle and data streams will be marked as
         // "unknown".
@@ -203,10 +201,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static IntPtr AcInit()
         {
-            lock (_Lock)
-            {
-                return _ac_init();
-            }
+            return _ac_init();
         }
 
         // Frees an Acinerella instance.
@@ -216,10 +211,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static void AcFree(IntPtr pAcInstance)
         {
-            lock (_Lock)
-            {
-                _ac_free(pAcInstance);
-            }
+            _ac_free(pAcInstance);
         }
 
         // Opens a media file.
@@ -274,10 +266,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
         public static Int32 AcOpen2(IntPtr pAcInstance, string filename)
             // ReSharper restore UnusedMethodReturnValue.Global
         {
-            lock (_Lock)
-            {
-                return _ac_open2(pAcInstance, filename);
-            }
+            return _ac_open2(pAcInstance, filename);
         }
 
         // Closes an opened media file.
@@ -287,10 +276,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static void AcClose(IntPtr pAcInstance)
         {
-            lock (_Lock)
-            {
-                _ac_close(pAcInstance);
-            }
+            _ac_close(pAcInstance);
         }
 
         // Stores information in "pInfo" about stream number "nb".
@@ -300,10 +286,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static void AcGetStreamInfo(IntPtr pAcInstance, Int32 nb, out SACStreamInfo info)
         {
-            lock (_Lock)
-            {
-                _ac_get_stream_info(pAcInstance, nb, out info);
-            }
+            _ac_get_stream_info(pAcInstance, nb, out info);
         }
 
         // Reads a package from an opened media file.
@@ -321,10 +304,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static IntPtr AcCreateVideoDecoder(IntPtr pAcInstance)
         {
-            lock (_Lock)
-            {
-                return _ac_create_video_decoder(pAcInstance);
-            }
+            return _ac_create_video_decoder(pAcInstance);
         }
 
         [DllImport(_AcDll, EntryPoint = "ac_create_audio_decoder", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]
@@ -332,10 +312,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static IntPtr AcCreateAudioDecoder(IntPtr pAcInstance)
         {
-            lock (_Lock)
-            {
-                return _ac_create_audio_decoder(pAcInstance);
-            }
+            return _ac_create_audio_decoder(pAcInstance);
         }
 
         // Frees an created decoder.
@@ -345,10 +322,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static void AcFreeDecoder(IntPtr pAcDecoder)
         {
-            lock (_Lock)
-            {
-                _ac_free_decoder(pAcDecoder);
-            }
+            _ac_free_decoder(pAcDecoder);
         }
 
         // Decodes a package using the specified decoder. The decodec data is stored in the
@@ -359,10 +333,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static bool AcDecodePackage(IntPtr pAcPackage, IntPtr pAcDecoder)
         {
-            lock (_Lock)
-            {
-                return _ac_decode_package(pAcPackage, pAcDecoder) != 0;
-            }
+            return _ac_decode_package(pAcPackage, pAcDecoder) != 0;
         }
 
         [DllImport(_AcDll, EntryPoint = "ac_get_audio_frame", ExactSpelling = true, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]
@@ -370,10 +341,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static bool AcGetAudioFrame(IntPtr pAcInstance, IntPtr pAcDecoder)
         {
-            lock (_Lock)
-            {
-                return _ac_get_audio_frame(pAcInstance, pAcDecoder) != 0;
-            }
+            return _ac_get_audio_frame(pAcInstance, pAcDecoder) != 0;
         }
 
         [DllImport(_AcDll, EntryPoint = "ac_get_frame", ExactSpelling = true, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]
@@ -381,10 +349,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static bool AcGetFrame(IntPtr pAcInstance, IntPtr pAcDecoder)
         {
-            lock (_Lock)
-            {
-                return _ac_get_frame(pAcInstance, pAcDecoder) != 0;
-            }
+            return _ac_get_frame(pAcInstance, pAcDecoder) != 0;
         }
 
         [DllImport(_AcDll, EntryPoint = "ac_skip_frames", ExactSpelling = true, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]
@@ -392,10 +357,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static bool AcSkipFrames(IntPtr pAcInstance, IntPtr pAcDecoder, Int32 num)
         {
-            lock (_Lock)
-            {
-                return _ac_skip_frames(pAcInstance, pAcDecoder, num) != 0;
-            }
+            return _ac_skip_frames(pAcInstance, pAcDecoder, num) != 0;
         }
 
         // Seeks to the given target position in the file. The seek funtion is not able to seek a single audio/video stream
@@ -408,10 +370,7 @@ namespace Vocaluxe.Lib.Video.Acinerella
 
         public static bool AcSeek(IntPtr pAcDecoder, Int32 dir, Int64 targetPos)
         {
-            lock (_Lock)
-            {
-                return _ac_seek(pAcDecoder, dir, targetPos) != 0;
-            }
+            return _ac_seek(pAcDecoder, dir, targetPos) != 0;
         }
 
         //function ac_probe_input_buffer(buf: PChar; bufsize: Integer; filename: PChar;