vt_map_frame      184 libavutil/hwcontext_videotoolbox.c     err = vt_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
vt_map_frame      215 libavutil/hwcontext_videotoolbox.c     err = vt_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE | AV_HWFRAME_MAP_OVERWRITE);