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Does overlay means DMA between capture card and video card or some color space conversion by video card ?



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<P>what is overlay ? Is it a function of graphic card or a function of video capture card or both?<BR>Someone told me : <BR>overlay means transfering video from capture card directly to video memory without cpu's involvement.<BR>Then according to this explaintion ,it should be the function of both.&nbsp; <BR>But from doc for SDL, I can also see yuvoverlay api. Does it mean without capture card ,SDL still can provide the overlay function.<BR>From this point, overlay should be the function of video card .<BR>Does overlay means DMA between capture card and video card or some color space conversion by video card ?</P><p><br><hr size=1><b>Do You Yahoo!?</b><br>
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