無法通過WWW加載電影

Question

我試圖通過網址加載視頻，但我不斷收到相同的錯誤。我使用的是Unity 5.3以及http://docs.unity3d.com/ScriptReference/WWW-movie.html的示例代碼（因爲當前示例未編譯而進行了大量修改）。

using UnityEngine; 
using System.Collections; 

// Make sure we have gui texture and audio source 
[RequireComponent (typeof(GUITexture))] 
[RequireComponent (typeof(AudioSource))] 
public class TestMovie : MonoBehaviour { 

    string url = "http://www.unity3d.com/webplayers/Movie/sample.ogg"; 
    WWW www; 

    void Start() { 
     // Start download 
     www = new WWW(url); 

     StartCoroutine(PlayMovie()); 
    } 

    IEnumerator PlayMovie(){ 
     MovieTexture movieTexture = www.movie; 

     // Make sure the movie is ready to start before we start playing 
     while (!movieTexture.isReadyToPlay){ 
      yield return 0; 
     } 

     GUITexture gt = gameObject.GetComponent<GUITexture>(); 

     // Initialize gui texture to be 1:1 resolution centered on screen 
     gt.texture = movieTexture; 

     transform.localScale = Vector3.zero; 
     transform.position = new Vector3 (0.5f,0.5f,0f); 
//  gt.pixelInset.xMin = -movieTexture.width/2; 
//  gt.pixelInset.xMax = movieTexture.width/2; 
//  gt.pixelInset.yMin = -movieTexture.height/2; 
//  gt.pixelInset.yMax = movieTexture.height/2; 

     // Assign clip to audio source 
     // Sync playback with audio 
     AudioSource aud = gameObject.GetComponent<AudioSource>(); 
     aud.clip = movieTexture.audioClip; 

     // Play both movie & sound 
     movieTexture.Play(); 
     aud.Play(); 

    } 

} 

我說這是一個腳本，在新場景中的主攝像頭，和我得到這個錯誤：

Error: Cannot create FMOD::Sound instance for resource (null), (An invalid parameter was passed to this function.) 
UnityEngine.WWW:get_movie() 
<PlayMovie>c__Iterator4:MoveNext() (at Assets/TestMovie.cs:20) 
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator) 
TestMovie:Start() (at Assets/TestMovie.cs:16) 

（第20行是MovieTexture movieTexture = www.movie;） 我一直工作在本作現在，它發生在很多文件和我的兩個系統上。

Answer 1

我不會提供WWW.movi​​e的解決方案，而是一種可以幫助您或其他人的替代解決方案。 在IPhone，我們沒有找到一個解決方案，以流從服務器的視頻，我們決定閱讀它之前下載的視頻，在這裏是如何：

string docPath = Application.persistentDataPath + "/" + id + ".mp4"; 
if (!System.IO.File.Exists(docPath)) 
{ 
    WWW www = new WWW(videouUrl); 
    while(!www.isDone) 
    { 
    yield return new WaitForSeconds(1); 
    Loading.Instance.Message = "Downloading video : " + (int)(www.progress * 100) + "%"; 
    if (!string.IsNullOrEmpty(www.error)) 
     Debug.Log(www.error); 
    } 
    byte[] data = www.bytes; 
    System.IO.File.WriteAllBytes(docPath, data); 
} 

mediaPlayer.Load(docPath); 
onVideoReady(); 

mediaPlayer.Play(); 

這是用來下載並寫上該視頻的協同程序iPhone的文件系統。一旦完成，您可以加載並播放它。 希望它有幫助。

Answer 2

我找到了解決方案！我使用unity 5.2.X和5.3.X來測試代碼。

我不知道爲什麼，但Unity3D需要第一個等待的單元下載完成與isDone == true和複製後紋理等待，直到isReadyToPlay == true。

電影文件必須是OGG視頻格式某些MP4文件不起作用。

好吧。檢查代碼：

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

public class MovieTextureStream : MonoBehaviour { 
    public Text progressGUI; 
    public MeshRenderer targetRender = null; 
    public AudioSource targetAudio = null; 
    public string URLString = "http://unity3d.com/files/docs/sample.ogg"; 
    MovieTexture loadedTexture; 

    IEnumerator Start() { 

     if(targetRender ==null) targetRender = GetComponent<MeshRenderer>(); 
     if(targetAudio ==null) targetAudio = GetComponent<AudioSource>(); 

     WWW www = new WWW (URLString); 
     while (www.isDone == false) { 
      if(progressGUI !=null) progressGUI.text = "Progresso do video: " + (int)(100.0f * www.progress) + "%"; 
      yield return 0; 
     } 

     loadedTexture = www.movie; 
     while (loadedTexture.isReadyToPlay == false) { 
      yield return 0; 
     } 
     targetRender.material.mainTexture = loadedTexture; 
     targetAudio.clip = loadedTexture.audioClip; 
     targetAudio.Play(); 
     loadedTexture.Play(); 
    } 
}