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byron_lui
June 9, 2006, 08:46:44
Hi,
i had use the "color filter" to do the color key things in the first video layer, but i find that i fail to place the background video to the background, could any body can help me to do this, thx (p.s. i test in by using the overlay mixer filter)

Marc Cymontkowski
June 9, 2006, 13:00:40
Hi,

If you use our MontiVision VMR Wrapper Control, it should work when setting the black background as alpha using the SetAlpha method:
VMR Mixer Control (http://www.montivision.com/support/documentation/noframes/source/vmr%20wrapper/imvvmrmixercontrol.htm)

Best Regards,

Marc

byron_lui
June 11, 2006, 07:01:41
Hi, Marc,

sorry, i still not understand how to setalpha....i am an idiot in programming...can you tell me more details?

Thx,
Regards,

Byron

Marc Cymontkowski
June 13, 2006, 21:08:02
Byron,

Sorry, i think i missundertood your requirements. You need a filter which supports the ARGB32 media type in order to be able to set per pixel alpha values. I recall we created a special version of the MV Buffer Access filter for somebody who wanted to do something similiar.


Best Regards,

Marc