can not get decoded data from appsink in GStreamer v1.0.9

[jojo]

Hi, 
My pipeline is :

pipe = gst_parse_launch("appsrc is-live=1 do-timestamp=1 caps=image/jpeg, width=1920, height=1080 name=\"appsrc\" ! decodebin ! queue !  videoconvert ! appsink caps=\"%s\" name=\"appsink\", GST_VIDEO_CAPS_MAKE("BGRx")).

g_signal_connect (appsink, "new-sample", G_CALLBACK (cb_new_buffer), data);

in the gstreamer v0.10, the callback is triggered if there are new buffer, but i can not get new data from this callback in the version 1.0.9,

some of my parameters of "gst_parse_launch" are wrong ?

Any hins will be helpful. 

Thanks,

- Jojo

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