diff --git a/openglosd.cpp b/openglosd.cpp
index dfea37e..06a1675 100644
--- a/openglosd.cpp
+++ b/openglosd.cpp
@@ -909,6 +909,7 @@ bool cOglCmdCopyBufferToOutputFb::Execute(void) {
 #endif
     ActivateOsd(oFb->texture,x, y, fb->Width() ,fb->Height());
     oFb->Unbind();
+	glFlush();
     pthread_mutex_unlock(&OSDMutex);
 
     return true;
diff --git a/video.c b/video.c
index 907612e..fbfe319 100644
--- a/video.c
+++ b/video.c
@@ -2855,27 +2855,28 @@ int get_RGB(CuvidDecoder * decoder)
     glActiveTexture(GL_TEXTURE0);
 
     if (OsdShown && decoder->grab == 2) {
-		int x,y,h,w;
+        int x,y,h,w;
         GLint texLoc;
-		if (OsdShown == 1) {
-			if (OSDtexture)
-				glDeleteTextures(1,&OSDtexture);
+        if (OsdShown == 1) {
+            if (OSDtexture)
+                glDeleteTextures(1,&OSDtexture);
+            pthread_mutex_lock(&OSDMutex);
+            glGenTextures(1, &OSDtexture);
+            glBindTexture(GL_TEXTURE_2D, OSDtexture);
+            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, OSDxsize, OSDysize, 0, GL_RGBA, GL_UNSIGNED_BYTE, posd);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+                        pthread_mutex_unlock(&OSDMutex);
+            OsdShown = 2;
+        }
 
-			glGenTextures(1, &OSDtexture);
-			glBindTexture(GL_TEXTURE_2D, OSDtexture);
-			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, OSDxsize, OSDysize, 0, GL_RGBA, GL_UNSIGNED_BYTE, posd);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
-			OsdShown = 2;
-		}
-
-		y = OSDy*height/VideoWindowHeight;
-		x = OSDx*width/VideoWindowWidth;
-		h = OSDysize*height/VideoWindowHeight;
-		w = OSDxsize*width/VideoWindowWidth;
-		glViewport(x,(height - h - y) , w, h);
+        y = OSDy*height/VideoWindowHeight;
+        x = OSDx*width/VideoWindowWidth;
+        h = OSDysize*height/VideoWindowHeight;
+        w = OSDxsize*width/VideoWindowWidth;
+        glViewport(x,(height - h - y) , w, h);
         glEnable(GL_BLEND);
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
@@ -2888,11 +2889,11 @@ int get_RGB(CuvidDecoder * decoder)
 
         glActiveTexture(GL_TEXTURE0);
 
-        pthread_mutex_lock(&OSDMutex);
+//      pthread_mutex_lock(&OSDMutex);
         glBindTexture(GL_TEXTURE_2D, OSDtexture);
         glBindFramebuffer(GL_FRAMEBUFFER, fb);
         render_pass_quad(0, 0.0, 0.0);
-        pthread_mutex_unlock(&OSDMutex);
+//      pthread_mutex_unlock(&OSDMutex);
 
         glUseProgram(0);
         glActiveTexture(GL_TEXTURE0);
@@ -3877,27 +3878,34 @@ static void CuvidDisplayFrame(void)
 
     if (OsdShown && valid_frame) {
         GLint texLoc;
+        int x,y,w,h;
         glBindTexture(GL_TEXTURE_2D, 0);
-		if (OsdShown == 1) {
-			if (OSDtexture)
-				glDeleteTextures(1,&OSDtexture);
-			
-			glGenTextures(1, &OSDtexture);
-			glBindTexture(GL_TEXTURE_2D, OSDtexture);
-			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, OSDxsize, OSDysize, 0, GL_RGBA, GL_UNSIGNED_BYTE, posd);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+        if (OsdShown == 1) {
+            if (OSDtexture)
+                glDeleteTextures(1,&OSDtexture);
+            pthread_mutex_lock(&OSDMutex);			
+            glGenTextures(1, &OSDtexture);
+            glBindTexture(GL_TEXTURE_2D, OSDtexture);
+            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, OSDxsize, OSDysize, 0, GL_RGBA, GL_UNSIGNED_BYTE, posd);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+            glFlush();
+            pthread_mutex_unlock(&OSDMutex);
 			OsdShown = 2;
-		}
+        }
         glBindTexture(GL_TEXTURE_2D, 0);
         glEnable(GL_BLEND);
         GlxCheck();
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
         GlxCheck();
 
-        glViewport(OSDx,(VideoWindowHeight - OSDysize - OSDy) , OSDxsize, OSDysize);
+        y = OSDy*VideoWindowHeight/OsdHeight;
+        x = OSDx*VideoWindowWidth/OsdWidth;
+        h = OSDysize*VideoWindowHeight/OsdHeight;
+        w = OSDxsize*VideoWindowWidth/OsdWidth;
+        glViewport(x,(VideoWindowHeight - h - y) , w, h);
  
         if (gl_prog_osd == 0)
             gl_prog_osd = sc_generate_osd(gl_prog_osd); // generate shader programm
@@ -3908,10 +3916,10 @@ static void CuvidDisplayFrame(void)
 
         glActiveTexture(GL_TEXTURE0);
 
-        pthread_mutex_lock(&OSDMutex);
+//      pthread_mutex_lock(&OSDMutex);
         glBindTexture(GL_TEXTURE_2D, OSDtexture);
         render_pass_quad(1, 0, 0);
-        pthread_mutex_unlock(&OSDMutex);
+//      pthread_mutex_unlock(&OSDMutex);
 
         glUseProgram(0);
         glActiveTexture(GL_TEXTURE0);