Unable to load movie via WWW

Question

I'm trying to load a video via url, but I keep getting the same error. I'm using Unity 5.3 and the example code from http://docs.unity3d.com/ScriptReference/WWW-movie.html (heavily modified because the current example doesn't compile).

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();

    }

}

I added this as a script to the Main Camera in a new scene, and I get this error:

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)

(Line 20 is MovieTexture movieTexture = www.movie;) I've been working on this for a while now, it's happened on many files and both of my systems.

Pero

I've been able to play video using Unity 5.2 and 5.1. It's the latest version with this issue. – Pero

Did you try just to wait a little longer? I don't know why this error appears now, possibly Unity bug, but looks like it does not stop function execution. If you wait a little longer, the movie will start normally and without sound problems (make sure pixelInset is set to some visible portion of the screen). – Attwood

For me, it does stop execution. When it was working on the previous versions, I had audio and tweaked settings to see the video. – Pero

Did you try yielding the www object before accessing www.movie? Yielding a www object will make the Coroutine stop until the download of the requested asset has been completed. How the behaviour with movie streams will be I do not know, but I would try it. – Sweetscented

Answer 1

I found a solution! I tested the code with unity 5.2.X and 5.3.X.

I dont know why but Unity 3d requires first wait unitl the download is done with isDone == true and after the copy of the texture wait until the isReadyToPlay == true.

The movie file must be OGG Video format some MP4 files doesn't work.

Well. Check the code:

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 ();
    }
}

Microstructure

I tried using your code word-for-word, and I still get the same error appearing on the line loadedTexture = www.movie; - the error reading: Error: Cannot create FMOD::Sound instance for resource (null), (An invalid parameter was passed to this function. ) UnityEngine.WWW:get_movie(). Do you have any components attached to the same object as this script, or anything else I might be missing? – Denney

In the Unity 5.3.1 This error in fact is a WARNING. If you compile your project will works perfectly. Maybe this is only a Unity 3D EDITOR bugs. – Microstructure

An another important thing is, you must attach an Audio Source and Mesh Render to the object you are attaching this code. – Microstructure

Answer 2

I won't provide a solution with the WWW.movie, but an alternative solution that may help ou or anyone else. On IPhone, we didn't find a solution to stream video from a server, we decided to download the video before reading it, here's how:

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();

This is the coroutine used to download and write the video on the iphone's file system. Once it's done, you can load and play it. Hope it helps.

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