gf_isom_set_media_subtype  673 applications/mp4box/fileimport.c 				gf_isom_set_media_subtype(import.dest, i+1, 1, stype);
gf_isom_set_media_subtype  796 applications/mp4box/fileimport.c 				gf_isom_set_media_subtype(import.dest, track, 1, stype);
gf_isom_set_media_subtype 1096 include/gpac/isomedia.h GF_Err gf_isom_set_media_subtype(GF_ISOFile *movie, u32 trackNumber, u32 sampleDescriptionIndex, u32 new_type);