Flurry image when showing BGRA raw pixels

[longkas]

Hello,
I'm using appsrc to stream BGRA frame buffers to the autovideosink, but the
image seems flurry and not clear,
but if I save the pixel buffers as PNG file, the image seems quite ok, see
my attachment, the above part is using appsrc to videosink and the bottom is
single frame buffer to PNG

<http://gstreamer-devel.966125.n4.nabble.com/file/t378770/appsrcBGRA.jpg> 

my appsrc looks like:
                appsrcCaps = gst_caps_new_simple("video/x-raw",
			"width", G_TYPE_INT, V_WIDTH,
			"height", G_TYPE_INT, V_HEIGHT,
			"format", G_TYPE_STRING, "BGRA",
			"framerate", GST_TYPE_FRACTION, 0, 1,
			NULL);
		gst_app_src_set_size(appSrc, -1);
		gst_app_src_set_duration(appSrc, GST_CLOCK_TIME_NONE);
		gst_app_src_set_stream_type(appSrc, GST_APP_STREAM_TYPE_STREAM);
		gst_app_src_set_max_bytes(appSrc, V_WIDTH * V_HEIGHT * 4 * 1);

		g_object_set(videotestsrc, "is-live", TRUE, NULL);
		g_object_set(videotestsrc, "do-timestamp", TRUE, NULL);
		g_object_set(videotestsrc, "format", GST_FORMAT_TIME, NULL);		
 
appsrc pipeline:
   #gst-launch-1.0  -v appsrc ! autovideosink
PNG test pipeline:
   #gst-launch-1.0  -v  filesrc location=e:/frame.png ! decodebin !
imagefreeze ! autovideosink               
                

any advice whats going on, thanks



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