glupload and gldownload performance

[sielf]

Hello!
I don't found any information about performance of data copy over glupload
and gldownload. What is the better way to evaluate costs of usage (memory
copying, data conversion etc.) opengl based plugins in gstreamer? I use
imx6, and will compare with hardware plugins from gstreamer-imx
P.S. Is it possible to write a shader for I420 data ?



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