<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hi. I'm using a pipeline to display live video from cameras to a QT application. Cameras' driver produces NV12 video, and for QT I'm using qmlglsink. Element qmlglsink seems to only accept RGBA, so I have to make the conversion. I'm doing it with this pipeline: v4l2src device="/dev/video1" ! video/x-raw,format=NV12,width=1440,height=1152,framerate=5/1 ! glupload ! glcolorconvert ! qmlglsink sync=false However, I'm getting very poor performance, around 1fps or less, and glcolorconvert seems to be the bottleneck. With this pipeline I get 25 fps with no problem: v4l2src device="/dev/video1" ! video/x-raw,format=NV12,width=1440,height=1152,framerate=25/1 ! glupload ! fakesink silent=false With 720x576 video I'm getting a better performance (obvious), but I need to use also 1440x1152 because this is video from the 4 cameras at the same time. Possible solutions that might be acceptable for me: <ul> <li>More efficient way of converting from NV12 to RGBA</li> <li>Efficient way of scale down to 720x576, or even less, before color conversion</li> <li>Two previous options at the same time</li> <li>Other solutions you might suggest </li> </ul> I'm running this on an ARM processor (Allwinner A20) with GPU and OpenGLES. This processor also have a Video Processing Unit that works with VDPAU. Thanks Iñigo </body> </html>