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• Get waveform data from audio file using FFMPEG

  28 janvier 2017, par Lutando

  I am writing an application that needs to get the raw waveform data of an audio file so I can render it in an application (C#/.NET). I am using ffmpeg to offload this task but it looks like ffmpeg can only output the waveform data as a png or as a stream to gnuplot.

  I have looked at other libraries to do this (NAudio/CSCore) however they require windows/microsoft media foundation and since this app is going to be deployed to azure as a web app I can not use them.

  My strategy was to just read the waveform data from the png itself but this seems hacky and over the top. The ideal output would be a fix sampled series of peaks in an array where each value in the array is the peak value (ranging from 1-100 or something, like this for example).

• mp4 to webm and ogv conversion not working using ffmpeg on linux server

  9 novembre 2016, par user75472

  I have a cron job to convert existing mp4 video file to ogv and webm using ffmpeg

  I have wordpress site with a page where user are allowed to upload mov and mp4 files. After the file is uploaded image is created from the video file and mov file is converted to mp4 successfully.

  However I need to concert uploaded mp4 file to webm and ogv to video work on all browsers. So I have set up cron job. Here is my code :

  include_once "../wp-config.php";
  
  ini_set('max_execution_time', 660); // 11 minutes
  
  // Get the path to the upload directory.
  
  $wp_upload_dir = wp_upload_dir();
  
  $dir = $wp_upload_dir['path'].'/';
  
  
  
  // Open a directory, and read its contents
  
  if (is_dir($dir)){
  
    if ($dh = opendir($dir)){
  
      while (($file = readdir($dh)) !== false){
  
        //echo "filename:" . $file . "<br />";
  
        $files = explode(".", $file);
  
        //echo end($fileinfo);
  
        if(end($fileinfo) == 'mp4') {
  
            $ffmpegPath = '/usr/local/bin/'; // linux
  
          //$ffmpegPath = 'C:\\ffmpeg\\bin\\'; // win
  
          if(!file_exists($dir.$files[0].'.webm')) {
  
  
  
                  $destFile = $dir.$files[0].'.webm';
  
  
  
                  $cmd = $ffmpegPath."ffmpeg -i ".$srcFile." -c:v libvpx -minrate 3900k -maxrate 3900k -b:v 3900k -c:a libvorbis ".$destFile;
  
  
  
            exec($cmd, $output, $retval);
  
            var_dump($output);
  
            var_dump($retval);
  
                  //exec($cmd);
  
          }
  
          if(!file_exists($dir.$files[0].'.ogv')) {
  
              //var_dump($fileinfo);
  
                  $destFile = $dir.$files[0].'.ogv';
  
  
  
                  $cmd1 = $ffmpegPath."ffmpeg -i ".$srcFile." -acodec libvorbis -ac 2 -ab 128k -ar 44100 -b:v 1200k ".$destFile;
  
  
  
            exec($cmd1, $output1, $retval1);
  
            var_dump($output1);
  
            var_dump($retval1);
  
          }
  
        }
  
      }
  
      closedir($dh);
  
    }
  
  }

  This works perfectly alright on windows but not working on linux, production server.

  I am missing something ?

• How to upload a transcoded file to s3 and create a link to download it

  29 septembre 2022, par Dotun Longe

  I want to download a video after my module "creates" it by combining a picture and audio file. The output goes to my tmp folder. This works, but I don't know how to access it.

  


  My method is to create another Paperclip attachment called "converted" and the module responsible for transcoding should also be responsible for uploading the converted video to a bucket, where I can then access it via @upload.converted.url.

  


  I have no idea how to go about this, and my eyes hurt from searching. If you have a better way for me to be able to download the transcoded video without this option, I will be open to it.

  


  # videocreatingproccessor.rb

require 'streamio-ffmpeg'
require 'fileutils'

module VideoCreatingProcessor
  def self.convert_to_video (path_to_audio_file, path_to_image_file)
    movie = FFMPEG::Movie.new(path_to_audio_file)
    options = {
      video_codec: "libx264",
      frame_rate: 60,
      resolution: "960x720",
      x264_vprofile: "high",
      x264_preset: "slow",
      pixel_format: "720p",
      audio_codec: "libfaac",
      audio_bitrate: 32,
      audio_sample_rate: 44100,
      audio_channels: 2,
      threads: 2,
    }

    woptions = { watermark: path_to_image_file, resolution: "960x720", watermark_filter: { padding_x: 10, padding_y: 10 } }

    movie.transcode("tmp/output.mp4",woptions ,options )
  end
end


  


  # uploads_controller.rb

class UploadsController < ApplicationController
  before_action :set_upload, only: [:show, :edit, :update, :destroy]

  def index
    @uploads = Upload.all
  end

  def paudioaddress
    "https:" + @upload.audio.url
  end

  def pimageaddress
    "https:" + @upload.image.url
  end

   def show
    require "video_creating_processor"
    newvideo = VideoCreatingProcessor.convert_to_video(paudioaddress, pimageaddress)
   end

   # ....
end