官方：https://github.com/bytedeco/javacv
引入依赖：
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv</artifactId>
<version>1.4.3</version>
</dependency>
<dependency>
<groupId>org.bytedeco.javacpp-presets</groupId>
<artifactId>ffmpeg-platform</artifactId>
<version>4.0.2-1.4.3</version>
</dependency>
import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import org.bytedeco.javacpp.avcodec; import org.bytedeco.javacv.FFmpegFrameGrabber; import org.bytedeco.javacv.FFmpegFrameRecorder; import org.bytedeco.javacv.Frame; import org.bytedeco.javacv.Java2DFrameConverter; public class VideoUtil { /** * 获取时长 */ public static long getDuration(File file) throws Exception { FFmpegFrameGrabber ff = new FFmpegFrameGrabber(file); ff.start(); long duration = ff.getLengthInTime() / (1000 * 1000); ff.stop(); return duration; } /** * 转MP4 */ public static String convertToMp4(File file) throws Exception { FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(file); Frame captured_frame = null; frameGrabber.start(); String fileName = file.getAbsolutePath() + "ToMp4.mp4"; FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(fileName, frameGrabber.getImageWidth(), frameGrabber.getImageHeight(), frameGrabber.getAudioChannels()); recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264); // avcodec.AV_CODEC_ID_H264 //AV_CODEC_ID_MPEG4 recorder.setFormat("mp4"); recorder.setFrameRate(frameGrabber.getFrameRate()); recorder.setSampleRate(frameGrabber.getSampleRate()); recorder.setAudioChannels(frameGrabber.getAudioChannels()); recorder.setFrameRate(frameGrabber.getFrameRate()); recorder.start(); while ((captured_frame = frameGrabber.grabFrame()) != null) { recorder.setTimestamp(frameGrabber.getTimestamp()); recorder.record(captured_frame); } recorder.stop(); recorder.release(); frameGrabber.stop(); return fileName; } /** * @title 获取视频帧转存图片 * @param file 源视频文件 * @param imgDir 图片存放路径文件夹 * @param step 取帧间隔，每隔多少帧截取一张 * @throws Exception */ public static void getFramePics(File file, String imgDir, int step) throws Exception { FFmpegFrameGrabber ff = new FFmpegFrameGrabber(file); // 获取视频文件 ff.start(); int len = ff.getLengthInVideoFrames(); // 视频帧长度 int index = 0; // 帧数 int currIndex = 0;// 图片计数 Frame frame = null; while (index <= len) { frame = ff.grabImage(); // 获取该帧图片流 if (frame != null && frame.image != null) { getImage(frame, imgDir, currIndex, step); // 生成帧图片 currIndex++; } index++; } ff.stop(); } private static void getImage(Frame frame, String imgDir, int currIndex, int step) { if (currIndex % step != 0) { return; } File dir = new File(imgDir); if (!dir.isDirectory() || !dir.exists()) { dir.mkdirs(); } File targetFile = new File(imgDir + currIndex + ".jpg"); String imgSuffix = "jpg"; Java2DFrameConverter converter = new Java2DFrameConverter(); BufferedImage srcBi = converter.getBufferedImage(frame); int owidth = srcBi.getWidth(); int oheight = srcBi.getHeight(); // 对截取的帧进行等比例缩放 int width = 800; int height = (int) (((double) width / owidth) * oheight); BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR); bi.getGraphics().drawImage(srcBi.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null); try { ImageIO.write(bi, imgSuffix, targetFile); } catch (Exception e) { e.printStackTrace(); } } }
学习：https://blog.csdn.net/jl19861101/article/details/94555851
