一、创建项目

1、创建Maven项目

2、添加依赖

在pom.xml中添加依赖配置，具体如下：

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<dependencies> <dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv-platform</artifactId> <version>1.3.1</version> </dependency> </dependencies>

二、具体实现

1、获取视频中间的帧作为缩略图，并返回缩略图实际存放地址

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package com.lyz.medis.image; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.imageio.ImageIO; import org.bytedeco.javacpp.opencv_core; import org.bytedeco.javacpp.opencv_core.IplImage; import org.bytedeco.javacv.FFmpegFrameGrabber; import org.bytedeco.javacv.Frame; import org.bytedeco.javacv.FrameGrabber.Exception; import org.bytedeco.javacv.Java2DFrameConverter; import org.bytedeco.javacv.OpenCVFrameConverter; /** * 获取视频缩略图 * @author liuyazhuang * */ public class VideoImage { private static final String IMAGEMAT = "png"; private static final String ROTATE = "rotate"; /** * 默认截取视频的中间帧为封面 */ public static final int MOD = 2; public static void main(String[] args) throws Exception { System.out.println(randomGrabberFFmpegImage("C:/lyz/1522372294724_79583.mov", 2)); } /** * 获取视频缩略图 * @param filePath：视频路径 * @param mod：视频长度/mod获取第几帧 * @throws Exception */ public static String randomGrabberFFmpegImage(String filePath, int mod) throws Exception { String targetFilePath = ""; FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath); ff.start(); String rotate = ff.getVideoMetadata(ROTATE); int ffLength = ff.getLengthInFrames(); Frame f; int i = 0; int index = ffLength / mod; while (i < ffLength) { f = ff.grabImage(); if(i == index){ if (null != rotate && rotate.length() > 1) { OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage(); IplImage src = converter.convert(f); f = converter.convert(rotate(src, Integer.valueOf(rotate))); } targetFilePath = getImagePath(filePath, i); doExecuteFrame(f, targetFilePath); break; } i++; } ff.stop(); return targetFilePath; } /** * 根据视频路径生成缩略图存放路径 * @param filePath：视频路径 * @param index：第几帧 * @return：缩略图的存放路径 */ private static String getImagePath(String filePath, int index){ if(filePath.contains(".") && filePath.lastIndexOf(".") < filePath.length() - 1){ filePath = filePath.substring(0, filePath.lastIndexOf(".")).concat("_").concat(String.valueOf(index)).concat(".").concat(IMAGEMAT); } return filePath; } /** * 旋转图片 * @param src * @param angle * @return */ public static IplImage rotate(IplImage src, int angle) { IplImage img = IplImage.create(src.height(), src.width(), src.depth(), src.nChannels()); opencv_core.cvTranspose(src, img); opencv_core.cvFlip(img, img, angle); return img; } /** * 截取缩略图 * @param f * @param targerFilePath:封面图片 */ public static void doExecuteFrame(Frame f, String targerFilePath) { if (null == f || null == f.image) { return; } Java2DFrameConverter converter = new Java2DFrameConverter(); BufferedImage bi = converter.getBufferedImage(f); File output = new File(targerFilePath); try { ImageIO.write(bi, IMAGEMAT, output); } catch (IOException e) { e.printStackTrace(); } } /** * 根据视频长度随机生成随机数集合 * @param baseNum:基础数字，此处为视频长度 * @param length：随机数集合长度 * @return:随机数集合 */ public static List<Integer> random(int baseNum, int length) { List<Integer> list = new ArrayList<Integer>(length); while (list.size() < length) { Integer next = (int) (Math.random() * baseNum); if (list.contains(next)) { continue; } list.add(next); } Collections.sort(list); return list; } }

2、随机生成多张缩略图，不返回缩略图实际存放地址

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package com.lyz.medis.image; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.imageio.ImageIO; import org.bytedeco.javacpp.opencv_core; import org.bytedeco.javacpp.opencv_core.IplImage; import org.bytedeco.javacv.FFmpegFrameGrabber; import org.bytedeco.javacv.Frame; import org.bytedeco.javacv.FrameGrabber.Exception; import org.bytedeco.javacv.Java2DFrameConverter; import org.bytedeco.javacv.OpenCVFrameConverter; /** * 获取图片缩略图 * @author liuyazhuang * */ public abstract class VideoImageFrame { public static void main(String[] args) throws Exception { randomGrabberFFmpegImage("e:/lyz/ffmpeg.mp4", "./target", "screenshot", 5); } /** * 生成图片缩略图 * @param filePath：视频完整路径 * @param targerFilePath：缩略图存放目录 * @param targetFileName：缩略图文件名称 * @param randomSize：生成随机数的数量 * @throws Exception */ public static void randomGrabberFFmpegImage(String filePath, String targerFilePath, String targetFileName, int randomSize) throws Exception { FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath); ff.start(); String rotate = ff.getVideoMetadata("rotate"); int ffLength = ff.getLengthInFrames(); List<Integer> randomGrab = random(ffLength, randomSize); int maxRandomGrab = randomGrab.get(randomGrab.size() - 1); Frame f; int i = 0; while (i < ffLength) { f = ff.grabImage(); if (randomGrab.contains(i)) { if (null != rotate && rotate.length() > 1) { OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage(); IplImage src = converter.convert(f); f = converter.convert(rotate(src, Integer.valueOf(rotate))); } doExecuteFrame(f, targerFilePath, targetFileName, i); } if (i >= maxRandomGrab) { break; } i++; } ff.stop(); } /** * 旋转图片 * @param src：图片 * @param angle:旋转角度 * @return */ public static IplImage rotate(IplImage src, int angle) { IplImage img = IplImage.create(src.height(), src.width(), src.depth(), src.nChannels()); opencv_core.cvTranspose(src, img); opencv_core.cvFlip(img, img, angle); return img; } /** * 生成缩略图 * @param f Frame对象 * @param targerFilePath * @param targetFileName * @param index */ public static void doExecuteFrame(Frame f, String targerFilePath, String targetFileName, int index) { if (null == f || null == f.image) { return; } Java2DFrameConverter converter = new Java2DFrameConverter(); String imageMat = "png"; String FileName = targerFilePath + File.separator + targetFileName + "_" + index + "." + imageMat; BufferedImage bi = converter.getBufferedImage(f); File output = new File(FileName); try { ImageIO.write(bi, imageMat, output); } catch (IOException e) { e.printStackTrace(); } } /** * 随机生成随机数集合 * @param baseNum：随机种子 * @param length：随机数集合长度 * @return：随机数集合 */ public static List<Integer> random(int baseNum, int length) { List<Integer> list = new ArrayList<>(length); while (list.size() < length) { Integer next = (int) (Math.random() * baseNum); if (list.contains(next)) { continue; } list.add(next); } Collections.sort(list); return list; } }