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前言 只是最近碰到有这方面的项目需求，所以简单 Mark 下本文。下面的示例是参考过他人分享的文章，之后本人再自行实践、调整和测试过的，希望对有这方面需求的人有所帮助。 示例添加依赖代码语言：javascript复制
org.bytedeco
javacv-platform
1.4.4
上述这段 maven 依赖包含了完整的 javacv 功能 (非常多，依赖Jar就占大概有500MB)，由于这里只使用到了其中 ffmpeg 这块的特性，因此也可以像下面这样排除掉无关的部分
代码语言：javascript复制
org.bytedeco
javacv
1.4.4
org.bytedeco
javacpp
org.bytedeco.javacpp-presets
flycapture
org.bytedeco.javacpp-presets
libdc1394
org.bytedeco.javacpp-presets
libfreenect
org.bytedeco.javacpp-presets
libfreenect2
org.bytedeco.javacpp-presets
librealsense
org.bytedeco.javacpp-presets
videoinput
org.bytedeco.javacpp-presets
opencv
org.bytedeco.javacpp-presets
tesseract
org.bytedeco.javacpp-presets
leptonica
org.bytedeco.javacpp-presets
flandmark
org.bytedeco.javacpp-presets
artoolkitplus
org.bytedeco
javacv-platform
1.4.4
org.bytedeco
javacv
org.bytedeco.javacpp-presets
flycapture-platform
org.bytedeco.javacpp-presets
libdc1394-platform
org.bytedeco.javacpp-presets
libfreenect-platform
org.bytedeco.javacpp-presets
libfreenect2-platform
org.bytedeco.javacpp-presets
librealsense-platform
org.bytedeco.javacpp-presets
videoinput-platform
org.bytedeco.javacpp-presets
opencv-platform
org.bytedeco.javacpp-presets
tesseract-platform
org.bytedeco.javacpp-presets
leptonica-platform
org.bytedeco.javacpp-presets
flandmark-platform
org.bytedeco.javacpp-presets
artoolkitplus-platform
核心代码获取视频时长代码语言：javascript复制 /**
* 获取视频时长，单位为秒
*
* @param video 源视频文件
* @return 时长（s）
*/
public static long getVideoDuration(File video) {
long duration = 0L;
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
try {
ff.start();
duration = ff.getLengthInTime() / (1000 * 1000);
ff.stop();
} catch (FrameGrabber.Exception e) {
e.printStackTrace();
}
return duration;
}截取视频指定帧为图片代码语言：javascript复制 /**
* 截取视频获得指定帧的图片
*
* @param video 源视频文件
* @param picPath 截图存放路径
*/
public static void getVideoPic(File video, String picPath) {
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
try {
ff.start();
// 截取中间帧图片(具体依实际情况而定)
int i = 0;
int length = ff.getLengthInFrames();
int middleFrame = length / 2;
Frame frame = null;
while (i < length) {
frame = ff.grabFrame();
if ((i > middleFrame) && (frame.image != null)) {
break;
}
i++;
}
// 截取的帧图片
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage srcImage = converter.getBufferedImage(frame);
int srcImageWidth = srcImage.getWidth();
int srcImageHeight = srcImage.getHeight();
// 对截图进行等比例缩放(缩略图)
int width = 480;
int height = (int) (((double) width / srcImageWidth) * srcImageHeight);
BufferedImage thumbnailImage = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
thumbnailImage.getGraphics().drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
File picFile = new File(picPath);
ImageIO.write(thumbnailImage, "jpg", picFile);
ff.stop();
} catch (IOException e) {
e.printStackTrace();
}
}测试用例代码语言：javascript复制 public static void main(String[] args) {
String videoPath = ResourceUtils.CLASSPATH_URL_PREFIX + "video.mp4";
File video = null;
try {
video = ResourceUtils.getFile(videoPath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
String picPath = "video.jpg";
getVideoPic(video, picPath);
long duration = getVideoDuration(video);
System.out.println("videoDuration = " + duration);
}
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