asset = GES.UriClipAsset.request_sync(clip_uri)
self.layer.add_asset(asset, start_time * Gst.SECOND, 0,
duration * Gst.SECOND, GES.TrackType.UNKNOWN)
asset = GES.UriClipAsset.request_sync(clip_uri)
self.layer.add_asset(asset, start_time * Gst.SECOND, 0,
duration * Gst.SECOND, GES.TrackType.UNKNOWN)