diff --git a/media/libeffects/visualizer/EffectVisualizer.cpp b/media/libeffects/visualizer/EffectVisualizer.cpp
index 03a6bbb..5505f14 100644
--- a/media/libeffects/visualizer/EffectVisualizer.cpp
+++ b/media/libeffects/visualizer/EffectVisualizer.cpp
@@ -65,8 +65,8 @@
 {
     pContext->mCaptureIdx = 0;
     pContext->mCurrentBuf = 0;
-    memset(pContext->mCaptureBuf[0], 0, VISUALIZER_CAPTURE_SIZE_MAX);
-    memset(pContext->mCaptureBuf[1], 0, VISUALIZER_CAPTURE_SIZE_MAX);
+    memset(pContext->mCaptureBuf[0], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
+    memset(pContext->mCaptureBuf[1], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
 }
 
 //----------------------------------------------------------------------------