找到了问题。下面是播放视频和音频的 固定 代码：

//Raw Image to Show Video Images [Assign from the Editor]
public RawImage image;
//Video To Play [Assign from the Editor]
public VideoClip videoToPlay;

private VideoPlayer videoPlayer;
private VideoSource videoSource;

//Audio
private AudioSource audioSource;

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

IEnumerator playVideo()
{
    //Add VideoPlayer to the GameObject
    videoPlayer = gameObject.AddComponent<VideoPlayer>();

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

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

    //We want to play from video clip not from url
    videoPlayer.source = VideoSource.VideoClip;

    //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
    while (!videoPlayer.isPrepared)
    {
        Debug.Log("Preparing Video");
        yield return null;
    }

    Debug.Log("Done Preparing Video");

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

    //Play Video
    videoPlayer.Play();

    //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");
}

为什么音频没有播放：

//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);

必须在videoPlayer.Prepare();不之后调用。经过数小时的实验，发现这是我遇到的问题。

停留在“准备视频”？

等待videoPlayer.Prepare();调用后等待5秒钟，然后退出while循环。

更换：

while (!videoPlayer.isPrepared)
{
    Debug.Log("Preparing Video");
    yield return null;
}

与：

//Wait until video is prepared
WaitForSeconds waitTime = new WaitForSeconds(5);
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;
}

这应该可以，但是在视频开始播放时您可能会遇到缓冲。使用此临时修复程序时，我的建议是提交带有“ videoPlayer.isPrepared always
true”标题的错误，因为这是一个错误。

有些人还通过更改来解决此问题：

videoPlayer.playOnAwake = false; 
audioSource.playOnAwake = false;

至

videoPlayer.playOnAwake = true; 
audioSource.playOnAwake = true;

从URL播放视频：

更换：

//We want to play from video clip not from url
videoPlayer.source = VideoSource.VideoClip;

与：

//We want to play from url
videoPlayer.source = VideoSource.Url;
videoPlayer.url = "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4";

然后删除 ：

public VideoClip videoToPlay;而videoPlayer.clip = videoToPlay;这些都不再需要。

从StreamingAssets文件夹播放视频：

string url = "file://" + Application.streamingAssetsPath + "/" + "VideoName.mp4";

if !UNITY_EDITOR && UNITY_ANDROID
    url = Application.streamingAssetsPath + "/" + "VideoName.mp4";
#endif

//We want to play from url
videoPlayer.source = VideoSource.Url;
videoPlayer.url = url;

所有支持的视频格式 ：

• v
• vp8
• Webm
• mov
• dv
• mp4
• m4v
• mpg
• mpeg

Windows上额外支持的视频格式 ：

• avi
• asf
• WMF

其中某些格式在某些平台上不起作用。有关支持的视频格式的更多信息，请参见这篇文章。