static int mov_write_mdia_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track) { int64_t pos = avio_tell(pb); avio_wb32(pb, 0); /* size */ ffio_wfourcc(pb, "mdia"); mov_write_mdhd_tag(pb, mov, track); mov_write_hdlr_tag(pb, track); mov_write_minf_tag(pb, track); return update_size(pb, pos); }