diff --git a/Makefile b/Makefile
index 974f6715c..0b39f06da 100644
--- a/Makefile
+++ b/Makefile
@@ -17,8 +17,8 @@ endif
 
 ifdef EMSDK
 CXX     := em++
-EMCXXFLAGS += -flto -sINITIAL_MEMORY=512MB -sTOTAL_MEMORY=512MB -s USE_PTHREADS=1 -pthread -msimd128
-EMLDFLAGS += -sUSE_GLFW=3 -sMAX_WEBGL_VERSION=2 -sUSE_ZLIB=1 -sWASM=1 -sWASM_BIGINT -sINITIAL_MEMORY=512MB -sTOTAL_MEMORY=512MB -sALLOW_MEMORY_GROWTH=1 -sUSE_PTHREADS=1 -pthread -sPTHREAD_POOL_SIZE=navigator.hardwareConcurrency -sLLD_REPORT_UNDEFINED --bind 
+EMCXXFLAGS += -flto -s USE_PTHREADS=1 -pthread -msimd128
+EMLDFLAGS += -sUSE_GLFW=3 -sMAX_WEBGL_VERSION=2 -sUSE_ZLIB=1 -sWASM=1 -sWASM_BIGINT -sINITIAL_MEMORY=512MB -sTOTAL_MEMORY=512MB -sUSE_PTHREADS=1 -pthread -sPTHREAD_POOL_SIZE=navigator.hardwareConcurrency -sLLD_REPORT_UNDEFINED --bind
 CXXFLAGS += $(EMCXXFLAGS) -c
 LDFLAGS += $(EMLDFLAGS)
 endif
diff --git a/src/common/viz2d.cpp b/src/common/viz2d.cpp
index 17b5988a8..3d1b42fb6 100644
--- a/src/common/viz2d.cpp
+++ b/src/common/viz2d.cpp
@@ -757,7 +757,11 @@ bool Viz2D::display() {
         makeCurrent();
         glfwPollEvents();
         screen().draw_contents();
+#ifndef __EMSCRIPTEN__
+        clglContext_->blitFrameBufferToScreen(getViewport(), getWindowSize(), isStretching());
+#else
         clglContext_->blitFrameBufferToScreen(getViewport(), getInitialSize(), isStretching());
+#endif
         screen().draw_widgets();
         glfwSwapBuffers(glfwWindow_);
         result = !glfwWindowShouldClose(glfwWindow_);
diff --git a/src/optflow/optflow-demo.cpp b/src/optflow/optflow-demo.cpp
index 274cc3f67..98fc9aea7 100644
--- a/src/optflow/optflow-demo.cpp
+++ b/src/optflow/optflow-demo.cpp
@@ -75,10 +75,10 @@ std::string pushImage(std::string filename){
                 cv::Mat v = videoFrame.getMat(cv::ACCESS_RW);
                 cvtColor(v, tmp, cv::COLOR_RGB2BGRA);
                 fs.read((char*)(tmp.data), tmp.elemSize() * tmp.total());
-                cvtColor(tmp, v, cv::COLOR_RGBA2BGR);
+                cvtColor(tmp, v, cv::COLOR_BGRA2BGR);
                 v.release();
                 tmp.release();
-                cerr << "match" << endl;
+//                cerr << "match" << endl;
             } else {
                 cerr << "mismatch" << endl;
             }
@@ -412,9 +412,10 @@ void setup_gui(cv::Ptr<kb::viz2d::Viz2D> v2d, cv::Ptr<kb::viz2d::Viz2D> v2dMenu)
 
     v2d->makeWindow(220, 175, "Settings");
 
+#ifndef __EMSCRIPTEN__
     v2d->makeGroup("Hardware Acceleration");
     v2d->makeFormVariable("Enable", use_acceleration, "Enable or disable libva and OpenCL acceleration");
-
+#endif
     v2d->makeGroup("Scene Change Detection");
     v2d->makeFormVariable("Threshold", scene_change_thresh, 0.1f, 1.0f, true, "", "Peak threshold. Lowering it makes detection more sensitive");
     v2d->makeFormVariable("Threshold Diff", scene_change_thresh_diff, 0.1f, 1.0f, true, "", "Difference of peak thresholds. Lowering it makes detection more sensitive");
@@ -423,11 +424,11 @@ void setup_gui(cv::Ptr<kb::viz2d::Viz2D> v2d, cv::Ptr<kb::viz2d::Viz2D> v2dMenu)
 
     v2dMenu->makeGroup("Display");
     v2dMenu->makeFormVariable("Show FPS", show_fps, "Enable or disable the On-screen FPS display");
+#ifndef __EMSCRIPTEN__
     v2dMenu->makeFormVariable("Stetch", stretch, "Stretch the frame buffer to the window size")->set_callback([=](const bool &s) {
         v2d->setStretching(s);
     });
 
-#ifndef __EMSCRIPTEN__
     v2dMenu->makeButton("Fullscreen", [=]() {
         v2d->setFullscreen(!v2d->isFullscreen());
     });