How do I get LumaKeyEnable to work?

Hi

I am using the simple_8_composite_vmem sample provided by Sravanthi K at Intel.

composite.InputStream[0].DstX = (mfxU32)0;

composite.InputStream[0].DstY = (mfxU32)0;

composite.InputStream[0].DstW = (mfxU32)720;

composite.InputStream[0].DstH = (mfxU32)576;

composite.InputStream[1].DstX = (mfxU32)0; //Co-ordinates for where the second stream should go on the output surface

composite.InputStream[1].DstY = (mfxU32)0;

composite.InputStream[1].DstW = (mfxU32)720;

composite.InputStream[1].DstH = (mfxU32)576;

composite.InputStream[1].LumaKeyEnable = true;

composite.InputStream[1].LumaKeyMin = 200;

composite.InputStream[1].LumaKeyMax =255;

I have change the values of each surface to 720 x 576 and enabled LumaKeyEnable and set LumaKeyMin and LumaKeyMax.

I have attached the input frames I have used and the resultant output frame.

There is little information on this within the documentation and the resultant frame is not correct.

Thanks for your help in advance,

Kevin