使用新的Unity VideoPlayer和VideoClip API播放视频

Z时代
2024-01-10
分类：问答

__在Unity

5.6.0b1发布之后，

MovieTexture

最终被弃用，并且现在发布了可在台式机和移动设备上播放视频的新API。

__如果需要，可以使用

VideoPlayer

和

VideoClip

播放视频并检索每个帧的纹理。

我设法使视频正常工作，但无法从Windows 10的编辑器中播放音频。有人知道为什么音频没有播放吗？

//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");
}

回答：

找到了问题。下面是播放视频和音频的代码：

//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");
}

//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。

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;

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。

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;

：