java-FFmpeg读取视频随机截图

package per.qy.dexter.video;

import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import javax.imageio.ImageIO;

import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.junit.Test;

public class FFmpegTest {

	@Test
	public void splitVideo() {
		FFmpegFrameGrabber frameGrabber = null;
		try {
			frameGrabber = FFmpegFrameGrabber.createDefault("d:/111.mp4");
			frameGrabber.start();
			long frameTime = frameGrabber.getLengthInTime() / 1000000;
			int frameLength = frameGrabber.getLengthInFrames();
			List<Integer> list = random(frameTime, frameLength);
			for (int i = 0; i < frameLength; i++) {
				Frame frame = frameGrabber.grabImage();
				if (list.contains(i)) {
					Java2DFrameConverter converter = new Java2DFrameConverter();
					BufferedImage image = converter.getBufferedImage(frame);
					FileOutputStream outFile = null;
					try {
						outFile = new FileOutputStream(
								"d:/111/" + UUID.randomUUID().toString().replaceAll("-", "") + ".png");
						ImageIO.write(image, "png", outFile);
					} catch (IOException e) {
					} finally {
						try {
							if (outFile != null) {
								outFile.close();
							}
						} catch (IOException e) {
						}
					}
				}
			}
			System.out.println(String.format("视频总时长=%ss，总帧数=%s，抽取帧数=%s", frameTime, frameLength, list.size()));
		} catch (org.bytedeco.javacv.FrameGrabber.Exception e) {
		} finally {
			if (frameGrabber != null) {
				try {
					frameGrabber.stop();
				} catch (org.bytedeco.javacv.FrameGrabber.Exception e) {
				}
			}
		}
	}

	private List<Integer> random(long frameTime, int frameLength) {
		long count = 200;
		if (frameTime <= 100) {
			count = 10;
		} else if (frameTime <= 1800) {
			count = frameTime / 10;
		}
		List<Integer> list = new ArrayList<Integer>();

		if (frameLength < count) {
			for (int i = 0; i < frameLength; i++) {
				list.add(i);
			}
			return list;
		}

		long range = (frameLength - 5) / count;
		for (long i = range + 5; i < frameLength; i = i + range) {
			int rand = (int) ((i - range) + Math.random() * range);
			list.add(rand);
		}
		return list;
	}

}