Getting Time in ms from Movie Texture?

I'm trying to implement this code to sync up audio to video that is being played back on a movie texture. I'm quite new to coding, and this error is throwing me - 'the name 'movieTexture' does not exist in the current context.

Can anyone advise as to what I'm doing wrong?

many thanks!

using UnityEngine; using System.Collections;

public class myDecoder : MonoBehaviour {

 // Create a new C# script and get the instance of TB Spat Decoder in game object/scene
 TBE.TBSpatDecoder Decoder;
 void Awake()
 {
     // Get the instance of TB Spat Decoder on the game object
     Decoder=Decoder.GetComponent<TBE.TBSpatDecoder> ();

     // Set the decoder to by synchronised to an external source
     Decoder.syncMode = TBE.TBSyncMode.TB_SYNC_EXTERNAL;
 }
     // Called every frame
 void Update() 
 {
     float videoTime = movieTexture.getTimeMs ();
     Decoder.setExternalClockInMs (videoTime);
     }
     
 void Start()
 {
     movieTexture.Play ();
     Decoder.play ();
 }
 }