extern crate rtsp; can't find crate

[lattice0]

On running the client.rs, I had to do

//IntErrorKind::Overflow => Ok(Overflow),

but I got

extern crate rtsp;

error[E0463]: can't find crate for `rtsp`
 --> rtsp-2/examples/client.rs:3:1
  |
3 | extern crate rtsp;
  | ^^^^^^^^^^^^^^^^^^ can't find crate