int64 requestFrame(int64 frame) {
		int64 currentFrame;
		GstFormat format = GST_FORMAT_DEFAULT;
		gst_element_seek(pipeline, 1.0, format,
			(GstSeekFlags)(GST_SEEK_FLAG_KEY_UNIT | GST_SEEK_FLAG_FLUSH),
			GST_SEEK_TYPE_SET, frame, GST_SEEK_TYPE_NONE, -1);
		gst_element_query_position(pipeline, &format, &currentFrame);
		return currentFrame;
	}