使用统一视频播放器无缝地播放不同的视频

Question

有没有人有任何解决这个问题的统一的视频播放器组件？

基本上，我有一个半交互式的应用程序，当事情发生时，它会背靠背地播放一系列视频。问题是，一旦第一个视频结束，就会有一个很好的3-5秒间隔，因为第二个视频需要时间来加载，但是在我的应用程序中，这看起来不太好。

我需要一种方式，要么预装第二个视频(理想)或相当简单的方式隐藏差距(如静止帧顶部)。对于后一种想法，我应该提到这些视频都是球形的。

using UnityEngine;
using UnityEngine.Video;

public class selectAndPlay_video : MonoBehaviour {

    public VideoPlayer videoPlayer;
    public VideoClip NewClip;
    void OnEnable()
    {
        videoPlayer.loopPointReached += loopPointReached;
    }

    void OnDisable()
    {
        videoPlayer.loopPointReached -= loopPointReached;
    }

   void loopPointReached(VideoPlayer v)

    {
       videoPlayer.clip = NewClip;
       videoPlayer.Play();
     }
}

Answer 1

解决这个问题的关键是VideoPlayer.Prepare()函数、VideoPlayer.time和VideoPlayer.clip.length属性。首先，我建议你忘记当前播放视频的方式。使用coroutine，正如this问题中的示例所做的那样，因为下面答案中的所有内容都假设您处于协同函数中。下面是如何播放不同的视频，而不需要等待很长时间：

1.Have数组/要播放的VideoClip列表。

2.Create来自#1中VideoClip数组的新VideoPlayer列表。只需使用来自VideoPlayer.clip #1的VideoClips设置属性。

3.Call VideoPlayer.Prepare()首先在列表中准备 VideoPlayer，然后在while循环中等待，直到准备完成或VideoPlayer.isPrepared变为true。

4.Call VideoPlayer.Play()播放您刚刚在#3中准备的视频。

连续播放不同的视频。

这是最重要的部分。

播放视频时，请检查正在播放的VideoPlayer的当前时间是否为视频长度的一半。如果是一半，在数组中的下一个视频上调用VideoPlayer.Prepare()，然后等待来自#4的视频在播放下一个视频之前完成播放。

通过这样做，下一个视频将开始准备自己，而当前的视频仍在播放，准备过程应在当前视频完成播放之前完成。然后，您可以播放下一个视频，而不等待它加载很长时间。

5.Wait从#4获得视频，在while循环中完成播放，直到VideoPlayer.isPlaying变成false为止。

6.While在#5中的while循环中等待，检查视频是否与if (videoPlayerList[videoIndex].time >= (videoPlayerList[videoIndex].clip.length / 2))播放了一半。如果这是真的，请调用列表中下一个VideoPlayer上的VideoPlayer以保持其就绪。

7.After while循环存在，当前视频正在播放。播放列表中的下一个VideoPlayer，然后从#5中再次重复，以准备列表中的下一个VideoPlayer。

下面的脚本应该完成我上面描述的所有事情。只需创建一个RawImage并将其插入图像插槽即可。您所有的视频都到了videoClipList变量。它应该一个一个地播放视频，而不需要很长的加载时间。Debug.Log很昂贵，所以一旦您验证它是否正常工作，就将它们删除。

//Raw Image to Show Video Images [Assign from the Editor]
public RawImage image;
//Set from the Editor
public List<VideoClip> videoClipList;

private List<VideoPlayer> videoPlayerList;
private int videoIndex = 0;


void Start()
{
    StartCoroutine(playVideo());
}

IEnumerator playVideo(bool firstRun = true)
{
    if (videoClipList == null || videoClipList.Count <= 0)
    {
        Debug.LogError("Assign VideoClips from the Editor");
        yield break;
    }

    //Init videoPlayerList first time this function is called
    if (firstRun)
    {
        videoPlayerList = new List<VideoPlayer>();
        for (int i = 0; i < videoClipList.Count; i++)
        {
            //Create new Object to hold the Video and the sound then make it a child of this object
            GameObject vidHolder = new GameObject("VP" + i);
            vidHolder.transform.SetParent(transform);

            //Add VideoPlayer to the GameObject
            VideoPlayer videoPlayer = vidHolder.AddComponent<VideoPlayer>();
            videoPlayerList.Add(videoPlayer);

            //Add AudioSource to  the GameObject
            AudioSource audioSource = vidHolder.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 Clip To Play 
            videoPlayer.clip = videoClipList[i];
        }
    }

    //Make sure that the NEXT VideoPlayer index is valid
    if (videoIndex >= videoPlayerList.Count)
        yield break;

    //Prepare video
    videoPlayerList[videoIndex].Prepare();

    //Wait until this video is prepared
    while (!videoPlayerList[videoIndex].isPrepared)
    {
        Debug.Log("Preparing Index: " + videoIndex);
        yield return null;
    }
    Debug.LogWarning("Done Preparing current Video Index: " + videoIndex);

    //Assign the Texture from Video to RawImage to be displayed
    image.texture = videoPlayerList[videoIndex].texture;

    //Play first video
    videoPlayerList[videoIndex].Play();

    //Wait while the current video is playing
    bool reachedHalfWay = false;
    int nextIndex = (videoIndex + 1);
    while (videoPlayerList[videoIndex].isPlaying)
    {
        Debug.Log("Playing time: " + videoPlayerList[videoIndex].time + " INDEX: " + videoIndex);

        //(Check if we have reached half way)
        if (!reachedHalfWay && videoPlayerList[videoIndex].time >= (videoPlayerList[videoIndex].clip.length / 2))
        {
            reachedHalfWay = true; //Set to true so that we don't evaluate this again

            //Make sure that the NEXT VideoPlayer index is valid. Othereise Exit since this is the end
            if (nextIndex >= videoPlayerList.Count)
            {
                Debug.LogWarning("End of All Videos: " + videoIndex);
                yield break;
            }

            //Prepare the NEXT video
            Debug.LogWarning("Ready to Prepare NEXT Video Index: " + nextIndex);
            videoPlayerList[nextIndex].Prepare();
        }
        yield return null;
    }
    Debug.Log("Done Playing current Video Index: " + videoIndex);

    //Wait until NEXT video is prepared
    while (!videoPlayerList[nextIndex].isPrepared)
    {
        Debug.Log("Preparing NEXT Video Index: " + nextIndex);
        yield return null;
    }

    Debug.LogWarning("Done Preparing NEXT Video Index: " + videoIndex);

    //Increment Video index
    videoIndex++;

    //Play next prepared video. Pass false to it so that some codes are not executed at-all
    StartCoroutine(playVideo(false));
}