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• FFMPEG — Create New Audio File using aselect filter API call in C code

  17 juin 2021, par AfricanMamba

  I have been working on an a program in C that invokes the use of FFMPEG's libraries to remove some segments of audio from a given audio file. I have created the filter successfully using the API call, const AVFilter* aselect = avfilter_get_by_name("aselect"), linking it with abuffersrc and abuffersink.

  


  However, I am not sure entirely sure what to pass in to the arguments when creating the filter because when I pass in the argument string, "'between(t,10,32)', asetpts = N/SR/TB output.wav", it gives me an error saying : "Invalid chars ',asetpts=N/SR/TBoutput.wav' at the end of expression"

  


  But when I pass in just "'between(t,10,32)'" as the arguments for the filter, the program compiles and runs but no output file is created with just the audio from 10 seconds to 32 seconds. Does anyone happen to know if it is even possible to use the aselect filter API to create new audio files or if there is an example that exists showing how to copy only frames from one audio file to another ? Thanks !

  


• FFmpeg code not working on http url for thumbnail extraction

  1er août 2014, par user2240379

  I am trying to extract thumbnail from sharepoint 2013 video library. I found a link which can extract using ffmpeg. this is the link :
  [How can I save first frame of a video as image ?

  filename = "http://siteurl/" + items["FileRef"].ToString();

  When i replaced the input file with sharepoint site url and video name then it does not produce any thumbnail. I also gives error on

  ffmpeg.Start();
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close()

  I would like to understand how make it work for http url.
  If it is not possible to use url in ffmpeg can anyone suggest another method to achieve thumbnail.(as i want the thumbnail to be set automatically using 1st frame from of video if it not set manually)

• 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;
  
  }