使用jcodec库，访问网络视频提取封面图片上传至oss

  注释部分为FFmpeg（确实方便但依赖太大，不想用）

package com.zuodou.upload;import com.aliyun.oss.OSS;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectRequest;
import com.zuodou.oss.OssProperties;
//import org.bytedeco.javacv.FFmpegFrameGrabber;
//import org.bytedeco.javacv.Frame;
//import org.bytedeco.javacv.Java2DFrameConverter;
import org.jcodec.api.FrameGrab;
import org.jcodec.common.io.FileChannelWrapper;
import org.jcodec.common.io.NIOUtils;
import org.jcodec.common.io.SeekableByteChannel;
import org.jcodec.common.model.Picture;
import org.jcodec.scale.AWTUtil;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.nio.channels.FileChannel;/**
* 截取视频图片
* @ClassName:  FrameGrabberKit   
*/
public class FrameVideoUtlis {/*** 获取指定视频的帧并保存为图片至指定目录* @param videofile  源视频文件路径* @param framefile  截取帧的图片存放路径 例：F:\hfkjrecorder\target\4.jpg* @throws Exception*/public  void getVedioImg(String videofile, String framefile,OSS ossClient){//截取封面图try {URL url = new URL(videofile);URLConnection connection = url.openConnection();InputStream inputStream = connection.getInputStream();// 创建临时文件File tempFile = File.createTempFile("video", ".mp4");// 将 InputStream 内容写入临时文件try (RandomAccessFile tempFileStream = new RandomAccessFile(tempFile, "rw")) {byte[] buffer = new byte[1024];int bytesRead;while ((bytesRead = inputStream.read(buffer)) != -1) {tempFileStream.write(buffer, 0, bytesRead);}}// 将临时文件转换为 SeekableByteChannelSeekableByteChannel channel = NIOUtils.readableChannel(tempFile);// 从视频流中抓取第一帧Picture grab = FrameGrab.getFrameFromChannel(channel,1);// 将视频帧转换为BufferedImageBufferedImage image = AWTUtil.toBufferedImage(grab);// 生成的预览图ByteArrayOutputStream outputStream = new ByteArrayOutputStream();ImageIO.write(image, "jpg", outputStream);//            FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(videofile);
//            grabber.start();
//            // 提取封面图像
//            Java2DFrameConverter converter = new Java2DFrameConverter();
//            Frame frame = grabber.grabImage();
//            BufferedImage image = converter.convert(frame);
//            // 不再需要保存为本地文件，直接上传到阿里云 OSS
//            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
//            ImageIO.write(image, "jpg", outputStream);// 保存封面图像byte[] imageBytes = outputStream.toByteArray();ObjectMetadata metadata = new ObjectMetadata();metadata.setContentLength(imageBytes.length);PutObjectRequest putObjectRequest = new PutObjectRequest(OssProperties.BUCKET_NAME, framefile.substring(1), new ByteArrayInputStream(imageBytes), metadata);// 创建PutObject请求。ossClient.putObject(putObjectRequest);
//            grabber.stop(); // 确保在代码块结束时释放资源tempFile.delete();} catch (Exception e) {e.printStackTrace();}}}