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• ffmpeg scale2ref explanation ?

  11 décembre 2020, par Geuis

  I'm applying a watermark to a video. I'm trying to get the watermark to scale proportionally to the video dimensions. I've seen maybe a dozen different answers using scale2ref, but no explanations as to actually what's happening, so I'm finding it difficult to know how to implement/make changes to the configs to work for my situation.

  



  Current overlay command :

  



  ffmpeg -i test.mp4 -i logo.png -filter_complex "overlay=0:0" output.mp4


  



  Some answers I've looked at :

  



  ffmpeg creating gif from images, add watermark during creation ?

  



  ffmpeg fix watermark size or percentage

  



  What are the rules to how scale2ref works ?

  


• How to convert this php code to javascript

  5 octobre 2019, par Salman

  I have this php code to check the progress percentage of a ffmpeg video conversion. Basically ffmpeg command generates a log file named "output.txt" from where i can estimate the percentage with the help of this code. I want to create a javascript code where i can directly estimate the percentage from the log file.

  $content = @file_get_contents('output.txt');
  
  
  
  if ($content) {
  
      //get duration of source
  
      preg_match("/Duration: (.*?), start:/", $content, $matches);
  
  
  
      $raw_duration = $matches[1];
  
  
  
      //raw_duration is in 00:00:00.00 format. This converts it to seconds.
  
      $array_reverse = array_reverse(explode(":", $raw_duration));
  
      $duration      = floatval($array_reverse[0]);
  
      if (!empty($array_reverse[1]))
  
          $duration += intval($array_reverse[1]) * 60;
  
      if (!empty($array_reverse[2]))
  
          $duration += intval($array_reverse[2]) * 60 * 60;
  
  
  
      //get the time in the file that is already encoded
  
      preg_match_all("/time=(.*?) bitrate/", $content, $matches);
  
  
  
      $raw_time = array_pop($matches);
  
  
  
      //this is needed if there is more than one match
  
      if (is_array($raw_time)) {
  
          $raw_time = array_pop($raw_time);
  
      }
  
  
  
      //raw_time is in 00:00:00.00 format. This converts it to seconds.
  
      $array_reverse = array_reverse(explode(":", $raw_time));
  
      $time          = floatval($array_reverse[0]);
  
      if (!empty($array_reverse[1]))
  
          $time += intval($array_reverse[1]) * 60;
  
      if (!empty($array_reverse[2]))
  
          $time += intval($array_reverse[2]) * 60 * 60;
  
  
  
      //calculate the progress
  
      $progress = round(($time / $duration) * 100);
  
  
  
      echo $duration;
  
      echo $time;
  
      echo $progress;
  
  }

• Python, grab frame number from FFMPEG

  22 janvier 2021, par Pyrometheous

  I'm using a script to compile an image sequence into a video.

  


  def ffmpeg_image_sequence(image_sequence, video, fps, encoder):
        global task
        task = False
        path = os.path.dirname(os.path.realpath(image_sequence))
        image_format = {
            'png': '\%06d.png',
            'iff': '\%06d.tiff',
            'tif': '\%06d.tif',
            'jpg': '\%06d.jpg'
        }
        sequence = path + image_format[image_sequence[-3:]]
        output_options = {
            'crf': 20,
            'preset': 'slow',
            'movflags': 'faststart',
            'pix_fmt': 'yuv420p',
            'c:v': encoder,
            'b:v': '20M'
        }
        try:
            (
                ffmpeg
                    .input(sequence, framerate=fps)
                    .output(video, **output_options)
            ).run()
        except ffmpeg.Error as e:
            warning(str(e))
        task = True


  


  I'm using wxPython for the GUI and ffmpeg for compiling the frames :

  


  import wx
import ffmpeg


  


  I'm running the above function in its own class so that it can be run in a different thread, allowing the statusbar to be updated with how much time has passed.

  


  def wait(start, text):
    time.sleep(.05)
    time_running = round(time.time() - start)
    update_status_bar(main_window, text + ' (Time Elapsed: ' + seconds_to_str(time_running) + ')')


  


  I'd like to replace this with ETA and percentage completed. The window that pops up when running the ffmpeg_image_sequence function displays the following information :

  


  frame=1234 fps= 16 q=13.0 size= 56789kB time=00:38:48.36 bitrate=12345.6kbits/sec speed=0.681x


  


  From what's printed to that window, I'd like to get the current frame= value to determine what percentage of the process is completed, then display something more like :

  


  def wait(text, frame, number_of_frames):
    time.sleep(.05)
    current_frame = frame
    number_of_frames = number_of_files_in_dir - 1
    percentage = round(current_frame / number_of_frames, 1)
    update_status_bar(main_window, text + ' ' + percentage + '% ' + Completed)


  


  With some math to calculate an ETA for completion as well.

  


  So, is there a way to grab that output text from the ffmpeg and turn just that frame= number into a variable ?