hololens 播放video

一. 最简单的方法 新建一个canvas，把 mp4视频（其它格式的应该也可以，没有试过）拖到 Canvas 下，什么都不用改，可以直接播放视频,此时全屏播放。 如下图：

效果如下图：

二. 通过RawImage播放视频

无法直接拖video到raw image的texture上，另外在RawImage上通过add component的方式添加video player也不行,需要一个叫Render Texture的控件关联。

参考：(78条消息) Unity UGUI Raw Image中文详解-Chinar_ChinarCSDN的博客-CSDN博客_rawimage

1. 新建一个空的New Render Texture（应该是关联video和raw image用的）

 2.raw image控件上通过add component的方式添加video player

3. 把要播放的视频拖到 video player上的video clip中，把第1步中的New Render Texture分别拖到video player上的target texture中（如下图）

和raw image控件上的raw image的texture中，如下图。

 大公告成，raw image控件播放video的好处是可以控制大小，但后来一想canvas调了大小也可以的吧，只是没测而已，好像没有优势。

3.使用url方式播放video，参考链接unity 播放视频videoplayer - 灰信网（软件开发博客聚合） (freesion.com)代码如下

using System.Collections;
using UnityEngine;
using UnityEngine.Video;

public class NewBehaviourScript : MonoBehaviour
{

    //public RawImage image;

    public VideoClip videoToPlay;

    private VideoPlayer videoPlayer;
    private VideoSource videoSource;

    private AudioSource audioSource;

    // Use this for initialization
    void Start()
    {
        Application.runInBackground = true;
        StartCoroutine(playVideo());
    }

    IEnumerator playVideo()
    {

        //Add VideoPlayer to the GameObject
        videoPlayer = gameObject.AddComponent();

        //Add AudioSource
        audioSource = gameObject.AddComponent();

        //Disable Play on Awake for both Video and Audio
        videoPlayer.playOnAwake = false;
        audioSource.playOnAwake = false;
        audioSource.Pause();

        //We want to play from video clip not from url

        videoPlayer.source = VideoSource.VideoClip;

        // Vide clip from Url
        //videoPlayer.source = VideoSource.Url;
        //videoPlayer.url = "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4";


        //Set Audio Output to AudioSource
        videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;

        //Assign the Audio from Video to AudioSource to be played
        videoPlayer.EnableAudioTrack(0, true);
        videoPlayer.SetTargetAudioSource(0, audioSource);

        //Set video To Play then prepare Audio to prevent Buffering
        videoPlayer.clip = videoToPlay;
        videoPlayer.Prepare();

        //Wait until video is prepared
        WaitForSeconds waitTime = new WaitForSeconds(1);
        while (!videoPlayer.isPrepared)
        {
            Debug.Log("Preparing Video");
            //Prepare/Wait for 5 sceonds only
            yield return waitTime;
            //Break out of the while loop after 5 seconds wait
            break;
        }

        Debug.Log("Done Preparing Video");

        //Assign the Texture from Video to RawImage to be displayed
        //image.texture = videoPlayer.texture;

        //Play Video
        videoPlayer.Play();
        /*videoPlayer.controlledAudioTrackCount = 1;             // <-- We have added this line. It tells video player that you will have one audio track playing in Unity AudioSource.
        videoPlayer.EnableAudioTrack(0, true);
        videoPlayer.SetTargetAudioSource(0, audioSource);*/

        //Play Sound
        audioSource.Play();
      
        Debug.Log("Playing Video");
        while (videoPlayer.isPlaying)
        {
            Debug.LogWarning("Video Time: " + Mathf.FloorToInt((float)videoPlayer.time));
            yield return null;
        }
        Debug.Log("Done Playing Video");
    }
}