static int mov_write_source_reference_tag(AVIOContext *pb, MOVTrack *track, const char *reel_name){ int64_t pos = avio_tell(pb); avio_wb32(pb, 0); /* size */ ffio_wfourcc(pb, "name"); /* Data format */ avio_wb16(pb, strlen(reel_name)); /* string size */ avio_wb16(pb, track->language); /* langcode */ avio_write(pb, reel_name, strlen(reel_name)); /* reel name */ return update_size(pb,pos); }