SELECT PASSWORD('enterYourMythTVPasswordHere');

    SELECT user,host,password FROM user WHERE user = 'mythtv';
     +--------+-------------+-------------------------------------------+
     | user   | host        | password                                  |
     +--------+-------------+-------------------------------------------+
     | mythtv | localhost   | *EncryptedMythTVPasswordWillBeHere....... |
     | mythtv | 192.168.%.% | *EncryptedMythTVPasswordWillBeHere....... |
     | mythtv | %           | *EncryptedMythTVPasswordWillBeHere....... |
     +--------+-------------+-------------------------------------------+