this is my code :

EXPORT_API void gub_pipeline_set_play_video_speed(GUBPipeline *pipeline, gdouble speed)
{
	gint64 position = GST_CLOCK_TIME_NONE;
	GstEvent *seek_event;

	gub_log_pipeline(pipeline, "ereate:: Setting play speed to %g", speed);
    gst_element_query_position(pipeline->pipeline, GST_FORMAT_TIME, &position);

	if(speed>0)
	{
		seek_event=gst_event_new_seek(speed,GST_FORMAT_TIME,GST_SEEK_FLAG_FLUSH|GST_SEEK_FLAG_ACCURATE,
			GST_SEEK_TYPE_SET,position,GST_SEEK_TYPE_NONE,GST_CLOCK_TIME_NONE);
	}
	else
	{
		seek_event=gst_event_new_seek(speed,GST_FORMAT_TIME,GST_SEEK_FLAG_FLUSH|GST_SEEK_FLAG_ACCURATE,
			GST_SEEK_TYPE_SET,0,GST_SEEK_TYPE_SET,position);
	}

	if(seek_event==NULL)
	{
		gub_log_pipeline(pipeline,"ereate:: gub_pipeline_set_volume(): get seek_event failled....");
		return ;
	}

	if(pipeline->video_sink ==NULL)
	{
    	//GstElement
		//sink = gst_bin_get_by_name(GST_BIN(vsink), "sink");
		g_object_get(pipeline->pipeline,"video-sink",&(pipeline->video_sink),NULL);
		if(pipeline->video_sink == NULL)
		{
			gub_log_pipeline(pipeline,"ereate:: gub_pipeline_set_volume(): get video_sink failled....");
			return ;
		}
	}

	gst_element_send_event(pipeline->video_sink,seek_event);
}


when I call the function "gub_pipeline_set_play_video_speed", the video stop to play video .

The Log:
  GStreamer encountered a general supporting library error. (gstamcvideodec.c(1020): _gl_sync_render_unlocked (): /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0/GstAmcVideoDec-OmxQcomVideoDecod.

could you help me to solve the problem ?