No video output using video overlay on qt embedded

Submitted by ess..@..ps.com

Description

I am using the cubieboard (embeded arm linux) trying to develop a video play using gstreamer and qt5. I ported gstreamer 1.4.5 to arm. It works well with playbin and xvimagesink. But as I want to output the vedio using my qt window, the movie played as well but no image was shown in the window, nor any errors reported. But the similar project works well on the PC.
As a result, I tried compiling the test project of overlay named qtgv-videooverlay, still there's no vedio frames and no error.
Can anyone tell me some possible cause of my problem? Thanks so much.