Generate Thumbnail from Video Using Java

public String generateThumnail(String videoUrl) {

		logger.info("************************************");

		FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(videoUrl);
		logger.info(" generateThumnail videoUrl---" + videoUrl);
		String fileName = videoUrl.substring(videoUrl.lastIndexOf('/') + 1);
		logger.info("generateThumnail fileName---" + fileName);
		fileName = fileName.substring(0, fileName.lastIndexOf("."));
		logger.info("generateThumnail fileName---1" + fileName);
		String path = thumbUrl + fileName + ".png";
		String filenameS3 = fileName + ".png";
		logger.info("generateThumnail filenameS3---1" + filenameS3);
		try {
			frameGrabber.start();
			Java2DFrameConverter aa = new Java2DFrameConverter();

			BufferedImage bi;
			Frame f = frameGrabber.grabKeyFrame();
			bi = aa.convert(f);
			while (bi != null) {
				ImageIO.write(bi, "png", new File(serverPath + fileName + ".png"));
				f = frameGrabber.grabKeyFrame();
				bi = aa.convert(f);
				File myFile = new File(serverPath + fileName + ".png");
				InputStream is = new FileInputStream(myFile);
				ObjectMetadata meta = new ObjectMetadata();
				meta.setContentType("image/png");
				meta.setContentLength(myFile.length());
				s3client.putObject(new PutObjectRequest(bucketNameThumb, filenameS3, is, meta)
						.withCannedAcl(CannedAccessControlList.PublicRead));

			}
			frameGrabber.stop();
		} catch (Exception e) {

			logger.info("Error Message: " + e.getMessage());
		}

		return path;

	}