gstreamer use waylandsink can not support NV12 format ?

[kevan.lan]

My weston version is weston-1.11.0, and when i use gst-launch-1.0 test
waylandsink RGB formats(BGRA, BGRx, RGB16) is ok,but NV12 format has errors.

# gst-launch-1.0 videotestsrc !
video/x-raw,format=NV12,height=1920,width=1080 ! waylandsink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Internal data flow error.
Additional debug info:
gstbasesrc.c(2948): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming task paused, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

What might be the problem? How to fix it?



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