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• converting complex ffmpeg command to python3

  14 janvier 2020, par Martin

  I have a complicated ffmpeg command that takes audio and image as input, and exports a music video.

  ffmpeg -loop 1 -framerate 2 -i "front.png" -i "testWAVfile.wav" \
  
      -vf "scale=2*trunc(iw/2):2*trunc(ih/2),setsar=1,format=yuv420p" \
  
      -c:v libx264 -preset medium -tune stillimage \
  
      -crf 18 -c:a aac -shortest -vf scale=1920:1080  "outputVideo.mp4"

  I’m trying to write a python3 program cmdMusicVideo.py which will run this command in pure Python. I know that to run this command you need the ffmpeg program, I’m trying to write it in pure python3, where I’m not just spawning a separate process to run the bash command where the user needs to have ffmpeg installed.

  I’ve looked at the various solutions to running ffmpeg in python3, and they’re either :

  • A : Just running the ffmpeg command as a subprocess, where the user needs to have ffmpeg installed
  • or B : An ffmpeg pip program like ffmpeg-python

  The pip libraries I’ve checkout out all use incredibly different formatting, and I haven’t found a way to replicate my ffmpeg command. I’ve searched the loop command in their python package documentation and it doesn’t appear anywhere.

  Is there a way to convert my ffmpeg command into a python3 program where the user doesn’t need to already have ffmpeg installed on their computer ?

  The plan is to eventually turn this into its own pip package, and my concern is that if I use the A method, there would be a case where somebody tries to run my pip command but doesn’t have ffmpeg installed on their terminal (maybe using a python3 specific terminal ?)

• 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.

• 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