如何使用FrameRecorder（javacv）合并两个以上的视频？

Question

有没有办法使用javacv open library合并两个以上的视频？

我尝试过以下代码，但一次只允许两个视频

void merge() {
FrameGrabber grabber1 = new FFmpegFrameGrabber(ffmpeg_link
                + "1.mp4");
        grabber1.start();           
        FrameGrabber grabber2 = new FFmpegFrameGrabber(ffmpeg_link
                + "2.mp4");
        grabber2.start();           
        FrameRecorder recorder2 = new FFmpegFrameRecorder("/mnt/sdcard/"
                + "output.mp4", grabber1.getImageWidth(),
                grabber1.getImageHeight(), grabber1.getAudioChannels());
        recorder2.setFrameRate(grabber1.getFrameRate());
        recorder2.setSampleFormat(grabber1.getSampleFormat());
        recorder2.setSampleRate(grabber1.getSampleRate());          
        recorder2.start();
        Frame frame;
        int j = 0;
        while ((frame = grabber1.grabFrame()) != null) {
            j++;
            recorder2.record(frame);                
        }           
        while ((frame = grabber2.grabFrame()) != null) {
            recorder2.record(frame);                
        }

        recorder2.stop();
        grabber2.stop();
        grabber1.stop();        


}  

由于