JavaCV/FFmpeg录制视频并添加多重滤镜

JavaCV录制视频时常遇到添加FFmpeg音视频滤镜的需求，FFmpeg内置很多常用的滤镜，如果添加多个滤镜的时候代码处理相对单个要复杂一点，使用滤镜的时候需要注意像素格式的转换，FFmpeg处理的时候隐含转换的细节以致于有时会遇到麻烦。
效果大概如下

		String outputPath = "D:/opencv_test/ffmpeg/live.flv";
		int width = 640, height = 480;
		//Logo图片的路径
		FFmpegFrameGrabber logoFrameGrabber = new FFmpegFrameGrabber("D:/opencv_test/ffmpeg/mylogo.jpg");
		logoFrameGrabber.start();
		Frame logoFrame = logoFrameGrabber.grab();
		Assert.notNull(logoFrame, "can't find Logo picture");
		//如果多个摄像头驱动请选择合适
		VideoInputFrameGrabber grabber = VideoInputFrameGrabber.createDefault(1);
		grabber.start();
		// 流媒体输出地址，分辨率（长，高），是否录制音频（0:单声道/1:立体声）
		FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputPath, width, height, 1);
		recorder.setInterleaved(true);
		recorder.setVideoOption("tune", "zerolatency");
		recorder.setVideoOption("preset", "ultrafast");
		recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264); // 28
		recorder.setFormat("flv"); // rtmp的类型
		int frameRate = 25;
		recorder.setFrameRate(frameRate);
		recorder.setGopSize(frameRate * 2);
		recorder.setAudioOption("crf", "0");
		recorder.setAudioQuality(0);// 最高质量
		recorder.setAudioBitrate(192000);
		recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
		recorder.setAudioChannels(1);
		recorder.setSampleRate(44100);
		recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P); // yuv420p
		recorder.start();
		String textfilterDesc = "[0:v]drawtext=fontsize=30:fontcolor=white:fontfile=E\\\\:/java/ffmpeg-20200831/bin/arial.ttf:text='Victorkevin%{localtime\\:%y\\-%m\\-%d %H-%M-%S}':x=20:y=20";
		String filterDesc = textfilterDesc
				+ ",scale=640:480[main];[1:v]scale=60:60,format=pix_fmts=rgb24[logo];[main][logo]overlay=x=20:y=50,format=rgb24[v]";
		FFmpegFrameFilter logoFrameFilter = new FFmpegFrameFilter(filterDesc, width, height);
		logoFrameFilter.setVideoInputs(2);
		logoFrameFilter.start();
		CanvasFrame canvas = new CanvasFrame("Capture Preview", CanvasFrame.getDefaultGamma() / grabber.getGamma());
		canvas.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		int count = 0;
		Frame frame = null;
		while ((frame = grabber.grab()) != null) {
     
			logoFrameFilter.push(0, frame, avutil.AV_PIX_FMT_RGB24);
			logoFrameFilter.push(1, logoFrame, avutil.AV_PIX_FMT_RGB24);
			frame = logoFrameFilter.pull();
			if (canvas.isVisible()) {
     
				canvas.showImage(frame);
			}
			recorder.record(frame, avutil.AV_PIX_FMT_BGR24);
			if (count++ == 150) {
     
				break;
			}
		}
		logoFrameFilter.close();
		canvas.dispose();
		grabber.stop();
		grabber.release();
		recorder.stop();
		recorder.release();