c# - 使用新的 Unity VideoPlayer 和 VideoClip API 播放视频

Question

MovieTexture在 Unity 5.6.0b1 发布后最终被弃用，现在发布了在桌面和移动设备上播放视频的新 API。

VideoPlayer和 VideoClip可用于播放视频并在需要时检索每一帧的纹理。

我已经设法让视频正常工作，但无法让音频在 Windows 10 上的编辑器中播放。有人知道为什么音频不播放吗？

//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 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");

    //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);

    //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");
}

Answer 1

发现问题。下面是播放视频和音频的FIXED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");
}

为什么没有播放音频:

//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(); 之前调用，而不是在它之后。这花了几个小时的实验才发现这是我遇到的问题。

---

卡在“准备视频”？

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

替换:

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;
}

这应该可行，但您可能会在视频开始播放时遇到缓冲。在使用此临时修复程序时，我的建议是提交标题为“videoPlayer.isPrepared always true”的错误，因为这是一个错误。

一些 people还通过更改修复了它:

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

到

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

---

从 URL 播放视频:

替换:

//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; 和 videoPlayer.clip = videoToPlay; 因为它们不再需要了。

播放 StreamingAssets 文件夹中的视频:

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:

• gv
• vp8
• webm
• 移动
• 视频
• mp4
• m4v
• 每加仑
• mpeg

Windows 上额外支持的视频格式:

• 视频
• asf
• wmf

其中一些格式在某些平台上不起作用。参见 this发布有关支持的视频格式的更多信息。