【Unity】获取视频某一帧的图片-Toy模板网

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;

public class Test : MonoBehaviour
{
    #region 获取视频某一帧图片
    VideoPlayer video;//视频
    Texture2D videoTextrue;//2D图片
    RenderTexture renderTexture;
    Sprite sprite;
    public Image image;

   
    void Start()
    {
        InitVideoToImage();
    }
    void InitVideoToImage()
    {
      
        videoTextrue = new Texture2D(2, 2);
        video = GetComponent<VideoPlayer>();//播放的视频
        video.playOnAwake = false;
        video.waitForFirstFrame = true;
        video.sendFrameReadyEvents = true;//启用 frameReady 事件。  如果设置为 true，则在准备绘制帧时将调用使用 VideoPlayer.frameReady 注册的任何委托。如果设置为 false，则不会调用已注册的委托
        video.frameReady += GetNumTextrue;// 新的一帧准备好时被执行。
        video.Play();
    }
    int framesValue = 0;//获得视频第几帧的图片
    /// <summary>
    /// 获取到framesValue帧的Textrue
    /// </summary>
    void GetNumTextrue(VideoPlayer source, long frameIdx)
    {
        framesValue++;
        if (framesValue == 1)
        {
            renderTexture = source.texture as RenderTexture;//放置视频内容的内部纹理。
            if (videoTextrue.width != renderTexture.width || videoTextrue.height != renderTexture.height)
            {
                videoTextrue.Resize(renderTexture.width, renderTexture.height);
            }
           // 当前处于活动状态的渲染纹理。
            RenderTexture.active = renderTexture;
            videoTextrue.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);//将屏幕像素读取到保存的纹理数据中。
            videoTextrue.Apply();//应用像素
            RenderTexture.active = null;
            video.frameReady -= GetNumTextrue;
            video.sendFrameReadyEvents = false;
        }
        StartCoroutine(ScaleTexture(videoTextrue, 1920, 1080));
    }
    /// <summary>
    /// 生成缩略图
    /// </summary>
    IEnumerator ScaleTexture(Texture2D source, int targetWidth, int targetHeight)
    {
        yield return new WaitForSeconds(2);

        Texture2D result = new Texture2D(targetWidth, targetHeight, TextureFormat.ARGB32, false);

        for (int i = 0; i < result.height; ++i)
        {
            for (int j = 0; j < result.width; ++j)
            {
                Color newColor = source.GetPixelBilinear((float)j / (float)result.width, (float)i / (float)result.height);
                result.SetPixel(j, i, newColor);
            }
        }
        result.Apply();

        sprite = Sprite.Create(result, new Rect(0, 0, targetWidth, targetHeight), new Vector2(0.5f, 0.5f));
        image.sprite = sprite;
       
    }
    #endregion

}

增加获取图片后的委托

using System.IO;
using UnityEngine;
using UnityEngine.Video;

/// <summary>获取视频预览</summary>
public class VideoPreview : MonoBehaviour
{
    /// <summary>获得视频第几帧的图片</summary>
    private int framesValue = 0;
    private VideoPlayer videoPlayer;
    private Texture2D videoFrameTexture;
    private RenderTexture renderTexture;
    /// <summary>视频保存路径</summary>
    private string videoUrl;
    /// <summary>视频预览图存放路径</summary>
    private string videoPreviewPath;

    public delegate void VideoThumbCompleteEvent(Texture2D texture);
    private VideoThumbCompleteEvent onCompleted;

    public static VideoPreview Create()
    {
        GameObject go = new GameObject("VideoPreview");
        VideoPreview videoPreview = go.AddComponent<VideoPreview>();
        return videoPreview;
    }

    private void OnDestroy()
    {
        videoFrameTexture = null;
        renderTexture = null;
    }

    /// <summary>
    /// 获取视频缩略图
    /// </summary>
    /// <param name="videoUrl">视频地址</param>
    /// <param name="completed">生成缩略图完成</param>
    public void VideoThumb(string videoUrl, VideoThumbCompleteEvent completed)
    {
        this.onCompleted = completed;
        this.videoUrl = videoUrl;
        string[] nameArr = videoUrl.Split('/');
        string imageName = nameArr[nameArr.Length - 1];// 缩略图的名字等于视频url的最后
        videoPreviewPath = Application.persistentDataPath + "/" + imageName + ".png";

        videoFrameTexture = new Texture2D(2, 2);
        videoPlayer = gameObject.AddComponent<VideoPlayer>();
        videoPlayer.source = VideoSource.Url;
        videoPlayer.url = videoUrl;
        videoPlayer.playOnAwake = false;
        videoPlayer.waitForFirstFrame = true;

        videoPlayer.sendFrameReadyEvents = true;
        videoPlayer.frameReady += onFrameReady;
        videoPlayer.Play();
    }

    private void onFrameReady(VideoPlayer source, long frameIdx)
    {
        framesValue++;
        if (framesValue == 5)
        {
            renderTexture = source.texture as RenderTexture;
            if (videoFrameTexture.width != renderTexture.width || videoFrameTexture.height != renderTexture.height)
            {
                videoFrameTexture.Resize(renderTexture.width, renderTexture.height);
            }
            RenderTexture.active = renderTexture;
            videoFrameTexture.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            videoFrameTexture.Apply();
            RenderTexture.active = null;
            videoPlayer.frameReady -= onFrameReady;
            videoPlayer.sendFrameReadyEvents = false;

            scaleTexture(videoFrameTexture, 600, 300, videoPreviewPath);
        }
    }

    //生成缩略图
    private void scaleTexture(Texture2D source, int targetWidth, int targetHeight, string savePath)
    {
        Texture2D result = new Texture2D(targetWidth, targetHeight, TextureFormat.ARGB32, false);
        for (int i = 0; i < result.height; ++i)
        {
            for (int j = 0; j < result.width; ++j)
            {
                Color newColor = source.GetPixelBilinear((float)j / (float)result.width, (float)i / (float)result.height);
                result.SetPixel(j, i, newColor);
            }
        }
        result.Apply();
        File.WriteAllBytes(savePath, result.EncodeToJPG());
        if (onCompleted != null) onCompleted(result);
        Destroy(gameObject);
    }

}

测试：文章来源地址https://www.toymoban.com/news/detail-611875.html


using UnityEngine;
using UnityEngine.UI;
 
public class Test : MonoBehaviour
{
    /// <summary>用来显示视频1缩略图UI</summary>
    public RawImage rawImage01;
    
 
    /// <summary>视频路径1（可以本地或网络）</summary>
    private string videoUrl1 = "/Users/chenyongliang/Desktop/相册/1657100515231.mp4";
   
 
    private void Start()
    {
        VideoPreview videoPreview1 = VideoPreview.Create();
        VideoPreview videoPreview2 = VideoPreview.Create();
        VideoPreview videoPreview3 = VideoPreview.Create();
 
        videoPreview1.VideoThumb(videoUrl1, (texture) =>
        {
            rawImage01.texture = texture;
        });

}

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