I’m trying to create a program that interacts with MPV in its CLI implementation

let mut output = Command::new("mpv")
    .arg(selected_song.unwrap())
    .arg("--no-video")
    .arg("--vo=null")
    .arg("--video=no")
    .stdin(Stdio::piped())
    .spawn()
    .expect("Failed to execute command");

let mut mpv_stdin = output.stdin.as_ref().unwrap();
loop {
    match get_pressed_key().unwrap().as_str() {
        "exit" => {
            let _ = mpv_stdin.write_all(b"q");
            break;
        },
        "pause" => {
            let _ = mpv_stdin.write_all(b"p");
            println!("Pressed pause")
        }
        _ => {}
    }
}

let _exit_status = output.wait();

I correctly match my “pause” event in get_pressed_key and write “p” to mpv process standard input buffer, but nothing happens, the song keeps playing normally