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• AWS Lambda function, API gateway and ffmpeg timeout issue

  3 novembre 2022, par Georgi Stoyanov

  I have created a lambda function, that is extracting the audio stream from a video file using ffmpeg. I have also configured API gateway as a trigger, where I am passing the file to the lambda function in the request body.

  


  The lambda function is working perfectly well with small files, but with bigger files, it needs a bit more time and then I am running into the API gateway timeout, which according to my understanding is set to 29 seconds max.

  


  So when I trigger audio extraction from a bigger file, I am hitting this timeout and my API request fails to return any result even though the transcoding still runs in the background and the file is extracted, so I was wondering what is the best approach to handle those cases, where the execution of the lambda function is taking longer ?

  


  I was thinking to start the transcoding in the background and simply return a JSON with a message that the transcoding might take a couple of minutes, depending on the input file duration, but if I try to push the ffmpeg to the background I am being presented with an error, that the destination file doesn't exist.

  


  os.system(f"{ffmpeg} -loglevel panic -nostdin -i {in_video} -vn -c:a aac -ar 48000 -b:a 192K {out_audio} 2> /dev/null &")


  


  This is the ffmpeg command extracting the audio and transcoding it to AAC.

  


  If I remove the 2> /dev/null & part of the command, it runs just fine, but if I keep it, I get an error :

  


  


  "errorMessage" : "[Errno 2] No such file or directory : 'output_audio.aac'"

  


  


  


  "errorType" : "FileNotFoundError"

  


  


  So I was wondering what is the preferred way to run processes in the background.

  


• Securely using the PHP exec function

  19 janvier 2012, par siberiantiger

  I am writing a PHP script designed to run an executable file (ffmpeg.exe) via the exec() function. The problem is that I have read that using the exec() function can be a security risk and should be avoided if possible. I have been doing some research into how to run the exec() function securely, and the only thing that I keep coming across is to filter the command string with escapeshellcmd or escapeshellarg. What I want to know is if it is possible to further increase security when using the exec() function or if there is a secure alternative to exec(). Any help would be appreciated.

  Here is my code ;

  define('FFMPEG_LIBRARY', 'c:\\ffmpeg7\\ffmpeg\\bin\\ffmpeg ');
  
  $transcode_string = FFMPEG_LIBRARY." -i " . $srcFile . " -acodec libmp3lame -ab 64k -ar 22050 -ac 1 -vcodec libx264 -b:v 250k -r 30 -f flv -y " . $destFile;
  
  $transcode_string = escapeshellcmd($transcode_string);
  
  exec($transcode_string);

  $srcFile is basically the video for transcoding while $destFile is the output file I wish to create.

• How to upload and overlay animation.html file from system and overlay over video in HTML or ANGULAR

  23 septembre 2020, par Hiren

  Hey I am trying to build an app which has a functionality of allowing a user to upload a pre-existing .HTML file from his system which contains a simple animation init

  


  I want to get that file and overlay the animation contained in .HTML file on my video and display it to the user.

  


  is that possible please help me if it is.

  


  


  


  body {
  background: #;
}

#fullScreenBox {
  height: 500px;
  width: 50%;
  background: #;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

#hiddenBox {
  width: 50%;
  height: 500px;
  background: #;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  overflow: hidden;
}

#title {
  width: 100%;
  height: 150px;
  background: #;
  /*U can also use #*/
  position: absolute;
  top: 200px;
  font-family: arial;
  font-size: 50px;
  color: white;
  text-align: center;
  opacity: 0;
}

#subtitle {
  width: 100%;
  height: 50px;
  background: #;
  /*U can also use #*/
  position: absolute;
  top: 300px;
  font-family: arial;
  font-size: 50px;
  color: red;
  text-align: center;
  opacity: 0;
}

#line01 {
  width: 25%;
  height: 4px;
  background: white;
  /*U can also use #*/
  position: absolute;
  top: 50px;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  color: white;
  opacity: 0;
}

#overlay {
  position: absolute;
  color: #FFF;
  text-align: center;
  font-size: 20px;
  padding: 10px 0;
  width: 50%;
  height: 500px;
  background: #;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

#v {
  height: 500px;
  width: 100%;
}

  


  &#xA;&#xA;  <div>&#xA;    <div class="">&#xA;      <div class="webvfx" data-animate="&#x27;{&#xA;">&#xA;        LONDON&#xA;      </div>&#xA;      <div class="webvfx" data-animate="&#x27;{&#xA;">&#xA;&#xA;      </div>&#xA;&#xA;      <div class="webvfx" data-animate="&#x27;{&#xA;">&#xA;        City of Dreams!&#xA;      </div>&#xA;    </div>&#xA;</div>

  


  


  



  This is my HTML file that contains a simple animation for example which is in user system

  


  In my application when user upload this file i want to overlay the animation contained in this file on the video as he uploads it is these any way
Thank you