start_guid        572 libavformat/wavenc.c     start_guid(pb, ff_w64_guid_fmt, &start);
start_guid        582 libavformat/wavenc.c         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
start_guid        587 libavformat/wavenc.c     start_guid(pb, ff_w64_guid_data, &wav->data);