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• imageJpeg and FFMPEG in windows vs linux

  25 janvier 2020, par Tanmay Gawankar

  I have a working code for converting image to a 5 seconds video using FFMPEG.

  The problem is, The code only works for downloaded images, FFMPEG doesn’t convert image to video when image is generated programmatically ONLY IN LINUX.

  PHP code

  <?php
  
      $downloadedF="folder/d.jpg";
  
      $downloadedV="folder/d.mp4";
  
      $renderedF="folder/r.jpg";
  
      $renderedV="folder/r.mp4";
  
  
  
      $op_d=shell_exec("ffmpeg -r 1/5 -i ".$downloadedF." -c:v libx264 -vf fps=25 -pix_fmt yuv420p ".$downloadedV);
  
      $op_r=shell_exec("ffmpeg -r 1/5 -i ".$renderedF." -c:v libx264 -vf fps=25 -pix_fmt yuv420p ".$renderedV);
  
  
  
      echo "Errors:<br />".$op_d."<br /><br />".$op_r;
  
  ?>

  The d.mp4(or output for downloaded image) is getting generated for both Windows and Linux
  The r.mp4(or output for rendered image) gets generated only in Windows and 48 bytes empty file is getting created in Linux

  System :

  XAMPP on Windows 10(Development)
  Godaddy Starter plan hosting - Linux(Probably redhat)(Production)

  File Structure

  root folder
  
      |-index.php
  
      |-ffmpeg (will be ffmpeg.exe in Windows)
  
      |-folder
  
          |-d.jpg (random downloaded image from google)
  
          |-d.mp4 (Will be created - video converted from downloaded image)
  
          |-r.jpg (rendered image using php imagejpg)
  
          |-r.mp4 (Will be created - video converted from rendered image)

  Rendered Image Code :

  $imgFF = imagecreatetruecolor($videoWidth, $videoHeight);
  
  //---adding many text using imagettftext();
  
  imagejpeg($imgFF, $path."-000.jpg");  //for this example, I copied output to folder as r.jpg

  Edit 1 :

  The return value of shell_exec has no error/output even after adding

  error_reporting(E_ALL);
  
  ini_set('display_errors', 1);

  Edit 2 :

  The log for successful conversion can be found at Here
  The log for unsuccessful conversion of rendered image can be found at Here

  Note :

  • The scenario here is minimized and code is separated from long code.
  • In Linux command i add ./ for FFMPEG

• Converting multiple RTP Streams into gRPC Stream

  20 janvier 2020, par GJ.

  I am receiving multiple RTP streams(g711 ulaw/alaw) which may be coming on TCP or UDP, I want to terminate the RTP and get the raw media from the RTP stream and stream it to a different destination by using Google gRPC protocol.

  Currently I have a RTP processing engine which does this and give me the raw stream from RTP stack which i further stream to gRPC destination, but this solution does not scale beyond 1000 streams on one host and is difficult to maintain.

  I want to replace this with some highly scalable solution where i can scale to several thousand of streams and does not need to be maintained.

  I am exploring option to Use ffmpeg / gstreamer for getting raw packets from RTP stream. Not sure how scalable it would be and how do i get hold of the stream so that i can stream it over gRPC.

  I have following questions :

  1. Is this good option to use ffmpeg / gstreamer for this purpose.
  2. How do i work with multiple streams any suggestions or sample.
  3. Any details about the scalability of ffmpeg / gstreamer.
  4. I plan to use Java for my application, which java wrapper would be good e.g. Xuggle / ffmpeg-cli-wrapper for ffmpeg.

• How to link the ffmpeg transcoding process information into a vb6 GUI app ?

  19 décembre 2019, par melaos

  i’m playing with a vb6 gui frontend for ffmpeg and as of now all i can do is to call the ffmpeg via cmd.exe which will shows the command prompt while the whole process is still running. And i thought this was the norm seeing how WinFF, another pascal based frontend gui for ffmpeg works.

  But i was blown away when i saw this other GVC gui which has a progress bar and everything.

  So basically, i’m looking into a way how i could cleanly hide the whole command prompt and link the transcoding progress to a progress bar into my gui.

  So here’s my plan, I’m thinking of finding a win32 api function which i can call the cmd line and yet hide it, and from another discussion here, i think i would have to read the log file to get the ffmpeg progress information.

  So which function should i call for the win32 api ?
  And does anyone knows of a better/easier way to get this done ?
  thanks

  Updates :

  In case anybody is interested, i find a nice class module on how to grab the cmd output into my vb6 app, and it’s by none other than the great joacim :)