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• Creating video from image using FFMPEG

  27 août 2012, par yashprit

  I am creating video editing application using JavaScript, ffmpeg and java. Using FFMPEG i have created extract n frame of video, than using canvas.toDataUrl I am replacing new image with existing image frame rate and everything has taken care, but when I use these image to create video, FFMPEG never include newly created PNG image.

  code to save png image from HTML5 canvas

  Base64 decoder = new Base64();
  
      byte[] pic = decoder.decodeBase64(request.getParameter("pic"));
  
      String frameCount = request.getParameter("frame");
  
      InputStream in = new ByteArrayInputStream(pic);
  
      BufferedImage bImageFromConvert = ImageIO.read(in);
  
      String outdir = "output\\"+frameCount;
  
      //Random rand = new Random();
  
      File file = new File(outdir);
  
      if(file.isFile()){
  
          if(file.delete()){
  
              File writefile = new File(outdir);
  
              ImageIO.write(bImageFromConvert, "png", file);
  
          }
  
      }

  Code for creating image from video

  String filePath = "D:\\temp\\some.mpg";
  
      String outdir = "output";
  
      File file = new File(outdir);
  
      file.mkdirs();
  
      Map m = System.getenv();
  
  
  
      /*
  
       * String command[] =
  
       * {"D:\\ffmpeg-win32-static\\bin\\ffmpeg","-i",filePath
  
       * ,"-r 30","-f","image2",outdir,"\\user%03d.jpg"};
  
       * 
  
       * ProcessBuilder pb = new ProcessBuilder(command); pb.start();
  
       */
  
      String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -i " + filePath
  
              + " -r 30  -f image2 " + outdir + "\\image%05d.png";
  
      Process p = Runtime.getRuntime().exec(commands);

  code for creating video from image

  String filePath = "output";
  
      File fileP = new File(filePath);
  
      String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -f image2 -i "
  
              + fileP + "\\image%5d.png " + fileP + "\\video.mp4";
  
      System.out.println(commands);
  
      Runtime.getRuntime().exec(commands);
  
      System.out.println(fileP.getAbsolutePath());

• Streaming WebRTC via ffmpeg to Facebook Live (RTMP) [on hold]

  5 février 2017, par Frederik Greve

  sorry for my bad english ;)

  I’ve got the following problem :
  I want to stream a Webcam (+audio) to Facebook Live. To capture the media I use getUserMedia. Now I will send the data to Facebook Live via RTMP.

  I tink there are two ways to do it, but I don’t know how.

  1. Create an Stream with WebRTC and encode it with ffmpeg to RTMP.
  2. Save every single frame with HTML5 Canvas and then stream it with ffmpeg. (In this case I don’t know to add sound from microphone.)

  I’m just using html5, Javacript and PHP.

• create bar type wave forms using ffmpeg

  8 juillet 2016, par Ashish Joshi

  i am trying to create wave forms from mp3 using ffmpeg.
  i have successfully created waveforms like below

  

  now i am having troubles with generating like below sample image...

  

  the code i am using to generate vertical line is provided below...

  while (!feof($handle) && $data_point < $data_size) {
  
              if ($data_point++ % DETAIL == 0) {
  
                  $bytes = array();
  
  
  
                  // get number of bytes depending on bitrate
  
                  for ($i = 0; $i < $byte; $i++) {
  
                      $bytes[$i] = fgetc($handle);
  
                  }
  
  
  
                  switch ($byte) {
  
                  // get value for 8-bit wav
  
                  case 1:
  
                      $data = findValues($bytes[0], $bytes[1]);
  
                      break;
  
                  // get value for 16-bit wav
  
                  case 2:
  
                      if (ord($bytes[1]) & 128) {
  
                          $temp = 0;
  
                      } else {
  
                          $temp = 128;
  
                      }
  
  
  
                      $temp = chr((ord($bytes[1]) & 100) + $temp);
  
                      $data = floor(findValues($bytes[0], $temp) / 256);
  
                      break;
  
                  }
  
  
  
                  // skip bytes for memory optimization
  
                  fseek($handle, $ratio, SEEK_CUR);
  
  
  
                  // draw this data point
  
                  // relative value based on height of image being generated
  
                  // data values can range between 0 and 255
  
                  $v = (int) ($data / 255 * $height);
  
  
  
                  // don't print flat values on the canvas if not necessary
  
                  if (!($v / $height == 0.5 && !$draw_flat))
  
                  // draw the line on the image using the $v value and centering it vertically on the canvas
  
                  {
  
                      imageline($img,
  
                          // x1
  
                          (int) ($data_point / DETAIL),
  
                          // y1: height of the image minus $v as a percentage of the height for the wave amplitude
  
                          $height * $wav - $v,
  
                          // x2
  
                          (int) ($data_point / DETAIL),
  
                          // y2: same as y1, but from the bottom of the image
  
                          $height * $wav - ($height - $v), imagecolorallocate($img, $r, $g, $b));
  
                  }
  
  
  
                  imageline($img1,
  
                      // x1
  
                      (int) ($data_point / DETAIL),
  
                      // y1: height of the image minus $v as a percentage of the height for the wave amplitude
  
                      $height * $wav - $v,
  
                      // x2
  
                      (int) ($data_point / DETAIL),
  
                      // y2: same as y1, but from the bottom of the image
  
                      $height * $wav - ($height - $v), imagecolorallocate($img1, $r1, $g1, $b1));
  
  
  
              }

  any help is appreciated...