int mov_write_smhd_tag(ByteIOContext *pb)
static int mov_write_smhd_tag(ByteIOContext *pb)
int mov_write_smhd_tag(ByteIOContext *pb){    put_be32(pb, 16); /* size */    put_tag(pb, "smhd");    put_be32(pb, 0); /* version & flags */    put_be16(pb, 0); /* reserved (balance, normally = 0) */    put_be16(pb, 0); /* reserved */    return 16;}