--- a/dom/media/platforms/agnostic/BlankDecoderModule.cpp
+++ b/dom/media/platforms/agnostic/BlankDecoderModule.cpp
@@ -141,27 +141,27 @@ public:
     buffer.mPlanes[0].mStride = mFrameWidth;
     buffer.mPlanes[0].mHeight = mFrameHeight;
     buffer.mPlanes[0].mWidth = mFrameWidth;
     buffer.mPlanes[0].mOffset = 0;
     buffer.mPlanes[0].mSkip = 0;
 
     // Cb plane.
     buffer.mPlanes[1].mData = frame.get() + sizeY;
-    buffer.mPlanes[1].mStride = mFrameWidth / 2;
-    buffer.mPlanes[1].mHeight = mFrameHeight / 2;
-    buffer.mPlanes[1].mWidth = mFrameWidth / 2;
+    buffer.mPlanes[1].mStride = (mFrameWidth + 1) / 2;
+    buffer.mPlanes[1].mHeight = (mFrameHeight + 1) / 2;
+    buffer.mPlanes[1].mWidth = (mFrameWidth + 1) / 2;
     buffer.mPlanes[1].mOffset = 0;
     buffer.mPlanes[1].mSkip = 0;
 
     // Cr plane.
     buffer.mPlanes[2].mData = frame.get() + sizeY;
-    buffer.mPlanes[2].mStride = mFrameWidth / 2;
-    buffer.mPlanes[2].mHeight = mFrameHeight / 2;
-    buffer.mPlanes[2].mWidth = mFrameWidth / 2;
+    buffer.mPlanes[2].mStride = (mFrameWidth + 1) / 2;
+    buffer.mPlanes[2].mHeight = (mFrameHeight + 1) / 2;
+    buffer.mPlanes[2].mWidth = (mFrameWidth + 1) / 2;
     buffer.mPlanes[2].mOffset = 0;
     buffer.mPlanes[2].mSkip = 0;
 
     // Set to color white.
     memset(buffer.mPlanes[0].mData, 255, sizeY);
     memset(buffer.mPlanes[1].mData, 128, sizeCbCr);
 
     return VideoData::CreateAndCopyData(mInfo,