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• ImageIO.write() freezes after 540 iterations

  14 octobre 2019, par the4naves

  I’m currently trying to write a simple audio visualizer (Non realtime), but am running into a very weird problem.

  After about 515-545 iterations of ImageIO.write(), the program freezes ; no exceptions, the program doesn’t crash, just, nothing.

  Before you read the code below, here’s a quick rundown of it to make it a bit easier to understand :
  1. Load data from program arguments.
  2. Start ffmpeg with its input set to stdin.
  3. In a loop ; Continually render an image, then send it to ffmpeg with ImageIO.write().

  Other info :
  I’ve verified ImageIO.write() IS actually the problem by placing a print before and after the try/catch statement.
  My first thought was a memory leak, but that doesn’t seem to be the case, at least according to Runtime.getRuntime().freeMemory() ;
  The iterations needed to freeze the program is inconsistent, though its always been in the range of 515-540.
  Rendering a video with less frames works flawlessly.
  My previous solution was to write all images to a folder, then run ffmpeg on them all at once. This worked fine on any number of frames, but used upwards of a gigabyte of storage for a fairly small test video, unacceptable for the small program I’m trying to create.

  As a final note, I realize the code probably has a ton of optimization/general problems, I haven’t had the time to try and get it to work well, as it isn’t even fully working yet.
  With that said, if you see any obvious problems, feel free to include them in your answer if you have the time, it’ll certainly save me some.

  Thanks

  public class Run {
  
  
  
      public static BufferedImage render = new BufferedImage(1920, 1080, BufferedImage.TYPE_INT_RGB);
  
  
  
      public static Graphics buffer = render.getGraphics();
  
  
  
      public static int frame = 0;
  
  
  
      public static double[] bins = new double[3200];
  
      public static double[] previousBins = new double[3200];
  
  
  
      public static File audio;
  
  
  
      public static BufferedImage background;
  
  
  
      public static OutputStream output;
  
  
  
      public static void main(String[] args) {
  
          try {
  
              String command = "cd /Users/admin/Desktop/render ; ffmpeg -r 60 -blocksize 150000 -i pipe:0 -i " + args[1].replaceAll(" ", "\\\\ ") + " final.mp4";
  
  
  
              System.out.println(command);
  
  
  
              ProcessBuilder processBuilder = new ProcessBuilder("bash", "-c", command);
  
  
  
              Process process = processBuilder.start();
  
  
  
              output = process.getOutputStream();
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          }
  
  
  
          try {
  
              background = ImageIO.read(new File(args[0]));
  
          } catch (IOException e) {
  
              System.out.println("File not found");
  
          }
  
  
  
          audio = new File(args[1]);
  
  
  
          ByteArrayOutputStream out = new ByteArrayOutputStream();
  
          BufferedInputStream in = null;
  
  
  
          try { in = new BufferedInputStream(new FileInputStream(audio));
  
          } catch (FileNotFoundException e1) {
  
              e1.printStackTrace();
  
          }
  
  
  
          try {
  
              out.flush();
  
  
  
              int read;
  
  
  
              byte[] buff = new byte[3200];
  
  
  
              while ((read = in .read(buff)) > 0) {
  
                  out.write(buff, 0, read);
  
              }
  
          } catch (IOException e1) {
  
              e1.printStackTrace();
  
          }
  
  
  
          byte[] audioBytes = out.toByteArray();
  
  
  
          System.out.println("Calculating length");
  
  
  
          int frames = 600;
  
  
  
          System.out.println("Rendering images");
  
  
  
          int[] data = new int[3200];
  
  
  
          int index = 0;
  
  
  
          while (frame < frames) {
  
              for (int i = 0; i < 3200; i++) {
  
                  data[i] = (short)(audioBytes[index + 2] << 16 | audioBytes[index + 1] << 8 | audioBytes[index] & 0xff);
  
  
  
                  index += 3;
  
              }
  
  
  
              index -= 4800;
  
  
  
              fourier(data, bins);
  
  
  
              renderImage();
  
  
  
              try {
  
                  ImageIO.write(render, "jpg", output);
  
              } catch (IOException e) {
  
                  e.printStackTrace();
  
              }
  
  
  
              frame++;
  
  
  
              if (frame % 20 == 0) {
  
                  System.out.println(frame + "/" + frames + " frames completed");
  
              }
  
          }
  
  
  
          System.out.println("Render completed");
  
  
  
          System.out.println("Optimizing file size");
  
  
  
          System.out.println("Optimization complete");
  
  
  
          System.out.println("Program complete");
  
  
  
          System.exit(0);
  
      }
  
  
  
      public static void renderImage() {
  
          buffer.drawImage(background, 0, 0, null);
  
  
  
          for (int i = 0; i < 110; i++) {
  
              int height = (int)((bins[i] + previousBins[i]) / Short.MAX_VALUE);
  
  
  
              buffer.fillRect(15 * i + 20, 800 - height, 10, (int)(height * 1.2));
  
          }
  
  
  
          System.arraycopy(bins, 0, previousBins, 0, 3200);
  
      }
  
  
  
      public static void fourier(int[] inReal, double[] out) {
  
          for (int k = 0; k < inReal.length; k++) {
  
              double real = 0.0;
  
              double imaginary = 0.0;
  
  
  
              for (int t = 0; t < inReal.length; t++) {
  
                  real += inReal[t] * Math.cos(2 * Math.PI * t * k / inReal.length);
  
                  imaginary -= inReal[t] * Math.sin(2 * Math.PI * t * k / inReal.length);
  
              }
  
  
  
              out[k] = Math.sqrt(Math.pow(real, 2) + Math.pow(imaginary, 2));
  
          }
  
      }
  
  
  
  }

• PHP Ajax XMLHttpRequest popen live progress

  21 février 2016, par John R

  I’m trying to output live : the ffmpeg progress

  It works great when I execute the php file alone : many lines with text appearing one after an other...

  ••• But when it’s a XMLHttpRequest context, the output is 1 line empty

  PHP working when not in AJAX situation :

  ini_set("output_buffering", "0");
  
  ob_implicit_flush(true);
  
  $call_mp4 = ' __FFMPEG Command HERE__ ';
  
  $proc = popen($call_mp4, 'r');
  
  while (!feof($proc)) {
  
      echo '['.date("i:s")."] ".fread($proc, 4096).'<br />';ob_flush();flush();
  
  }

  Does someone know why in AJAX it’s blank and only 1 line ?
  how can this be fixed ?

  Regards

• Not able to generate a video from image URLS

  23 janvier 2023, par rupal biyani

  I am using image urls to generate video using ffmpeg but a blank video is generated :
PFB my command :

  


  ffmpeg -framerate 1 -protocol_whitelist file,http,https,tcp,tls,crypto -i https://tstatic//file.jpg -c:v libx264 -r 30 output.mp4

  


  Here https://tstatic//file.jpg will be replaced by actual URL

  


  I ran the above command