Dear all I am trying to build a player in R car-E2.(arm based board). I already build weston, gstreamer-1.0, waylandsink and fbdevsink on R car-E2. I tested video rendering as gst-launch-1.0 ! Waylandsink. But i got plenty of error messages like "ERROR:from element /Gstpipeline:pipeline0/GstvideoTestsrc:videotestsrc0:internal data flow error Streaming task paused, reason not-negitiated (-4). ERROR:pipeline doesn't want to Preroll". So i used fbdevsink to test rendering like gst-launch-1.0 videotestsrc ! Fbdevsink. It works but didnt play any video on Weston/wayland. Can anyone help me to find the exact error behind this. When i debugged i saw linking error between videotestsrc and waylandsink. Yours Faithfully Abin