rem: if (bvw->priv->play->length_nanos) return TRUE; else return FALSE;
add: if (bvw->priv->stream_length) return TRUE; else return FALSE;
context: bacon_video_widget_is_seekable (BaconVideoWidget *bvw){	g_return_val_if_fail (bvw != NULL, FALSE);	g_return_val_if_fail (BACON_IS_VIDEO_WIDGET(bvw), FALSE);	g_return_val_if_fail (GST_IS_PLAY(bvw->priv->play), FALSE);	if (bvw->priv->play->length_nanos)		return TRUE;	else		return FALSE;}