start_guid        554 libavformat/wavenc.c     start_guid(pb, ff_w64_guid_fmt, &start);
start_guid        565 libavformat/wavenc.c         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
start_guid        570 libavformat/wavenc.c     start_guid(pb, ff_w64_guid_data, &wav->data);