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• Update Database After shell_exec() Using FFMPEG/Laravel

  25 April 2020, by Mike

  I want to update a database record (MySQL) after the FFMPEG process is complete. Normally I would just call a function just after the FFMPEG command, but I needed to add > /dev/null 2>/dev/null & so I didn't have to wait for the FFMPEG process to complete which would mean the REST call would hang for a LONG time and that would cause bad UX for the front-end.

  



  I'm not sure where to begin with it. My first thought is to make a REST request, but maybe calling the method in Laravel directly would be better.

  



  Can I do a curl call after the FFMPEG command? Or can I call a PHP method? Or is there a better way?

  



  PHP FFMPEG Method

  



  private function transcode($movie)
{
    try {
        $name       = 'master.' . $movie->extension;
        $this->path = storage_path('app/public/movies/') . $movie->id . '/';
        $fps        = $this->getFrameRate($name);
        $width      = $this->getVideoWidth($name);
        $height     = $this->getVideoHeight($name);

        // ffmpeg commands
        $c = $this->buildCommand($width, $height, $fps);

        // ffmpeg -  added '> /dev/null 2>/dev/null &' so it will not wait to finish
        $ffmpeg = shell_exec('ffmpeg -i ' . $this->path . $name . ' -progress ' . $this->path . 'transcode.log' . $c . ' > /dev/null 2>/dev/null &');

        return response()->json(['message' => 'transcode initiated'], 200); 

    }
    catch(\Exception $e)
    {
        return response()->json(['error' => $e->getMessage()], 500);
    }
}


  



  Here is the bash curl post idea

  



  $curl = 'curl --data "param1=value1&param2=value2" http://hostname/transcode/complete';

$ffmpeg = shell_exec('ffmpeg -i ' . $this->path . $name . ' -progress ' . $this->path . 'transcode.log' . $c . '; $curl > /dev/null 2>/dev/null &');


  



  I could be going down the wrong path with the above, but I'm trying to move forward with something.

  


• Matplotlib animation MovieWriters fails on Ubuntu 12.04

  13 February 2013, by jjwebster

  I am attempting to save matplotlib animations to a movie via ffmpeg on Ubuntu 12.04 LTS (32-bit Desktop). Following the matplotlib example, it fails to load the animation writer: AttributeError: 'module' object has no attribute 'writers' (line 15 of the example):

  import numpy as np
  
  import matplotlib
  
  matplotlib.use("Agg")
  
  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  
  
  def update_line(num, data, line):
  
      line.set_data(data[...,:num])
  
      return line,
  
  
  
  # Set up formatting for the movie files
  
  Writer = animation.writers['ffmpeg']

  Via apt-get, I've tried installing ffmpeg, every codec imaginable, and even tried to compile ffmpeg from source. Nothing works.

  How do I get matplotlib to talk to ffmpeg on Ubuntu?

• Making a video out of frames in Python

  6 June 2021, by amit

  I have to create a video using earlier extracted frames and the following code works fine:

  


  import os
    
fps = 25

os.system("ffmpeg -r fps -i Encode/encode_image%01d.png -vcodec mpeg4 -y movie.mp4")


  


  But storing framerate (which is 25 in this case) in fps variable and passing it in -r, I am getting following error:

  


  


  "Error parsing framerate fps."

  


  


  Meanwhile, the code below, creates a video:

  


  import os

fps = 25
os.system("ffmpeg -r 25 -i Encode/encode_image%01d.png -vcodec mpeg4 -y movie.mp4")


  


  But the framerate is different for every one of my videos (that's why I am storing it in a variable).
Due to above error I am unable to pass different frame rate value each time and, I cannot type the value (like 25) directly.

  


  Please suggest me some way to tackle this problem or provide me with another Python code to combine frames into video.