Add date and time with seconds

[aguileraps]

Hello, I am trying to add the date and time with seconds to the frame, it works fine but the seconds are not updated, I did not find documentation on how time works according to the frames, can you guide me?

    @Override
    public Frame produce() {
        BufferedImage image = creteBackgroundImage();
        Graphics2D g = image.createGraphics();

        Date currentDate = new Date();
        SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
        String dateTime = format.format(currentDate);

        Text(g, dateTime, 25, 20, 40);
        long pts = currentDate.getTime();
        return Frame.createVideoFrame(0, pts, image);
    }

I want to create a pattern like this
https://rtsp.stream/videos/pattern.mp4

[kokorin]

First of all, check what PTS is, it's not current timestamp. PTS of the first frame should be 0, in your code it will never be so.

Check GIF example https://github.com/kokorin/Jaffree/blob/master/src/test/java/examples/ProduceVideoExample.java

[aguileraps]

Hello, thank you for your quick response, I did the test with the example, the result is the same, in the video the seconds remain static, but in the console output they are displayed correctly, I leave the test complete

    @GetMapping(value = "/test")
    @ResponseBody
    public ResponseEntity<StreamingResponseBody> test() {

        FrameProducer producer = new FrameProducer() {
            private long frameCounter = 0;

            @Override
            public List<Stream> produceStreams() {
                return Collections.singletonList(new Stream()
                        .setType(Stream.Type.VIDEO)
                        .setTimebase(1000L)
                        .setWidth(320)
                        .setHeight(240)
                );
            }

            @Override
            public Frame produce() {

                BufferedImage image = new BufferedImage(320, 240, BufferedImage.TYPE_3BYTE_BGR);
                Graphics2D graphics = image.createGraphics();
                graphics.setPaint(Color.BLUE);
                graphics.fillRect(0, 0, 320, 240);

                Font font = new Font("Arial", Font.PLAIN, 24);
                graphics.setFont(font);
                graphics.setColor(Color.WHITE);

                Date currentDate = new Date();
                SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
                String dateTime = format.format(currentDate);

                graphics.drawString(dateTime, 50, 50);

                System.out.println("dateTime : " + dateTime);

                long pts = frameCounter * 1000 / 10; // Frame PTS in Stream Timebase
                Frame videoFrame = Frame.createVideoFrame(0, pts, image);
                frameCounter++;

                return videoFrame;
            }
        };

        return ResponseEntity.ok()
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .body(os -> {
                    try {
                        FFmpeg.atPath()
                                .setLogLevel(LogLevel.ERROR)
                                .addInput(FrameInput.withProducer(producer))
                                .addOutput(PipeOutput.pumpTo(os)
                                        .setFormat("ismv"))
                                .execute();
                    } catch (Exception e) {
                        System.err.println("Fin SMPTE");
                    }
                });
    }

[kokorin]

I'm sure if you try to wait longer seconds will start to change. This happens because there is no guarantee that FFMPEG reads frame in real time. If it has big enough buffer it can read frame ahead of play time.
You have to decide what time you want to display in video: current time or time when each frame was produced. In your current approach it's "time when each frame was produced".

[kokorin]

You could also force ffmpeg to read frames at x1 framerate. Try UrlInput#setReadAtFrameRate(...) - it sets -re input argument.

[aguileraps]

Thanks for the answers, for now I put a countdown on it, when I have more time I'll look at the date and time again, thanks for the library!

        if (pts % 1000 == 0) {
            countdown--;
            if (countdown < 0) {
                countdown = 9;
            }
        }