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视频生成缩略图

最近有个需求，视频上传之后在列表和详情页需要展示缩略图

使用ffmpeg

首先引入jar包

<dependency><groupId>org.bytedeco</groupId><artifactId>javacpp</artifactId><version>1.4.3</version>
</dependency>
<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>

代码如下

public String getThumbnails(String videoFilePath){String path = "/Users/zhanghe/Desktop/pic/";String fileName =  videoFilePath.substring(videoFilePath.lastIndexOf("/") + 1, videoFilePath.lastIndexOf("."))+"_thumb.jpg";String filePath = StringUtils.join(path, fileName);File targetFile = new File(filePath);try {FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videoFilePath);ff.start();// 视频总帧数int videoLength = ff.getLengthInFrames();org.bytedeco.javacv.Frame f  = null;int i = 0;while (i < videoLength) {// 过滤前20帧,因为前20帧可能是全黑的// 这里看需求，也可以直接根据帧数取图片f = ff.grabFrame();if (i > 20 && f.image != null) {break;}i++;}int owidth = f.imageWidth;int oheight = f.imageHeight;// 对截取的帧进行等比例缩放int width = 800;int height = (int) (((double) width / owidth) * oheight);Java2DFrameConverter converter = new Java2DFrameConverter();BufferedImage fecthedImage = converter.getBufferedImage(f);BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);bi.getGraphics().drawImage(fecthedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH),0, 0, null);ImageIO.write(bi, "jpg", targetFile);ff.stop();System.out.println(targetFile.getPath());return targetFile.getPath();} catch (IOException e) {e.printStackTrace();}return "";}

参考文献

• 视频生成缩略图