PreLoader.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.IO;
using System;

public class PreLoader : MonoBehaviour
{
    public Slider slider;

    void Start()
    {
        this.StartCoroutine("CopyFile");

    }

    IEnumerator CopyFile()
    {
        #if UNITY_ANDROID && !UNITY_EDITOR
        string basename = "glued_converted.mp4_";
        string dir = Application.persistentDataPath + "/";
        if (!File.Exists(dir + basename))
        {
			for (int videoFiles = 0; videoFiles < 2; videoFiles++)
			{
	            for (int sub = 0; sub < 20; sub++)
	            {
	                WWW unpackerWWW = new WWW("jar:file://" + Application.dataPath + "!/assets/" + basename + "." + sub.ToString());
	                //try
	                {
	                    while (!unpackerWWW.isDone)
	                    {
	                    } // This will block in the webplayer.
	                    if (!string.IsNullOrEmpty(unpackerWWW.error))
	                    {
	                        Debug.Log("Error unpacking 'jar:file://" + Application.dataPath + "!/assets/" + basename + "'");
	                        dir = "";
	                        //break;

	                    }
	                    else
	                    {
	                        Debug.Log(basename + " readed");
	                    }
	                    FileMode fMode = FileMode.Create;
	                    if (sub > 0)
	                    {
	                        fMode = FileMode.Append;
	                    }
	                    using (FileStream stream = new FileStream(dir + basename, fMode, FileAccess.Write))
	                    {
	                        stream.Write(unpackerWWW.bytes, 0, unpackerWWW.bytes.Length);
	                        stream.Close();
	                    }
	                    slider.value += 0.025f;
	        	        yield return null;
	                    //File.WriteAllBytes (dir + basename, unpackerWWW.bytes); // 64MB limit on File.WriteAllBytes.
	                }
	                //catch (Exception e)
	                {
	                    //Debug.LogError("Error copying movie: " + e);
	                }
				}
				basename = "glued_second.mp4_";
			}
        }
        #endif
        yield return null;
        Application.LoadLevel(1);
    }
}