/**
 * 截取 rtmp 图片
 * @param rtmpUrl
 * @return
 */
public static String snapshot(String rtmpUrl,String path){
    String result=null;
    try(FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(rtmpUrl)){
        grabber.start();
        while (true) {
            Frame frame = grabber.grabImage();
            if (frame != null) {
                BufferedImage bufferedImage = null;
                Java2DFrameConverter imgConverter = new Java2DFrameConverter();
                bufferedImage = imgConverter.convert(frame);
                SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyyMMddHHmmss");
                String imageName ="sanpshot_"+simpleDateFormat.format(new Date())+".jpg";
                File out = Paths.get(path, imageName).toFile();
                ImageIO.write(bufferedImage, "jpg", out);
                return out.getAbsolutePath();
            }
        }
    }catch (Exception e){
        log.error("snapshot",e);
    }
    return result;
}

/**
 * 截取 rtmp 图片
 * @param rtmpUrl
 * @return
 */
public static String startRecording(String rtmpUrl,String path){
    String result=null;
    try(FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(rtmpUrl)){
        grabber.start();
        SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyyMMddHHmmss");
        String videoName =path+File.separator+"sanpshot_"+simpleDateFormat.format(new Date())+".mp4";
        // 用于存储视频 , 先调用stop，在释放，就会在指定位置输出文件
        try(FrameRecorder recorder = FrameRecorder.createDefault(videoName, grabber.getImageWidth(), grabber.getImageHeight())){
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);// 编码，使用编码能让视频占用内存更小，根据实际自行选择
            recorder.start();
            Frame captured_frame = null;
            /**
             * 最多录制十分钟
             */
            Long now=System.currentTimeMillis();
            Long tNow=now+60*1000;
            while (now < tNow) {
                now=System.currentTimeMillis();
                try {
                    captured_frame = grabber.grabFrame();
                    if (captured_frame != null) {
                        recorder.record(captured_frame);
                    }
                } catch (Exception e) {
                    log.error("captured_frame",e);
                }
            }
            // 释放资源
            recorder.stop();
            recorder.release();
            grabber.stop();
        }
    }catch (Exception e){
        log.error("snapshot",e);
    }
    return result;
}