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Convert 8bit grayscale buffer to be accepted by vpuenc gstreamer element?

Question asked by chris whittenburg on Sep 8, 2014
Latest reply on Oct 9, 2014 by chris whittenburg

I have a monochrom image sensor connected to my imx6q board, capturing 30fps 1280x960 8bit grayscale images using gstreamer and the mfw_v4lsrc element.  Converting from 8bit grayscale to I420 should be quick, but it appears memcpy out of a dma coherent buffer is very inefficient.  What other tricks can I use to do this in hardware?  Converting to I420 should involve just growing the buffer by 614,400 bytes and filling that area with 128.