You looked at the unity docs for VideoPlayer? prepareCompleted is probably what you want.

Thank you for replying. I have checked in the playback methods but I can't find anything wrong.

I have the videos loading in separate quads with their own videoplayers. My code is as below -

using System;

using System.Collections;

using System.Collections.Generic;

using Lean.Touch;

using UnityEngine;

using UnityEngine.Video;

using UnityEngine.UI;

public class QuadPress1 : MonoBehaviour

{

    public GameObject quadObject;

    public FadeInOut1 script;

    public VideoClip[] vids = new VideoClip[8];

public AudioClip[] audioClipArray;

    private Collider quadCollider;

    private UnityEngine.Video.VideoPlayer quadPlayer;

    private AudioSource quadAudio;

public System.DateTime startTime;

public double timeInt;

    private bool vidPlaying;

    private bool enter = false;

private bool playFlag;

    public int delay;

    private bool playStop;

private int count;

string fQuad = "";

public System.DateTime ts;

private double timespan;

//public startPlaying myParent;

    void Start()

    {

        delay = 10;

        playStop = false;

  playFlag = false;

        quadPlayer = quadObject.GetComponent<UnityEngine.Video.VideoPlayer>();

        quadAudio = quadObject.GetComponent<AudioSource>();

        quadCollider = quadObject.GetComponent<MeshCollider>();

  //myParent = transform.parent.GetComponent<parentscriptclass>();

        vidPlaying = false;

  quadPlayer.clip = vids[count];

  quadAudio.clip = audioClipArray[count];

    }

    void Update()

    {

        var fingers = LeanTouch.Fingers;

        if (delay > 0)

        {

            delay--;

        }

        else

        {

            if (fingers.Count == 1)

            {

                Ray ray = Camera.main.ScreenPointToRay(fingers[0].ScreenPosition);

                RaycastHit hit;

                if (Physics.Raycast(ray, out hit))

                {

                    if (hit.collider == quadCollider)

                    {                      

                        playStop = true;

     

                        delay = 1;

                    }

                }

            }

            if (playStop && !quadPlayer.isPlaying)

            {

    if(quadPlayer.GetComponentInParent<Toggle>().isOn){

     quadPlayer.Play();

     quadAudio.Play();

     playStop = false;

     delay = 10;

     vidPlaying = true;

     this.transform.parent.GetComponent<startPlaying1>().startTime = System.DateTime.Now;

     quadPlayer.GetComponentInParent<Toggle>().isOn = false;



    }

    else{

     ts = System.DateTime.Now;

     timespan = (ts - this.transform.parent.GetComponent<startPlaying1>().startTime).TotalSeconds;

     if(playFlag == false)

     StartCoroutine(waitToPlay());//plays the videos with a time gap

    }

            }

            else if (playStop && !script.fadeOut)

            {

    if(enter == false)

    StartCoroutine(your_timer()); //waits for sometime before the video fadesout

            }

            if (!quadPlayer.isPlaying && vidPlaying)

            {

    if(enter == false)

    StartCoroutine(your_timer2()); //waits for sometime before the video fadesout

            }

        }

    }

}

Take a look at the callback methods for Videoplayer, should be one that tells you when the video is ready.  Hide before that and in that method show it.