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• What options I should use to rescale video without skewing them in FFMPEG Rails ?

  5 juin 2019, par ADMAT Bandara

  The main issue happens when it processes the recalling

  All videos uploading from Apple iOS will process nicely.
  But all videos uploading from Android devices are getting skewed.

  In my rails app, I am using Carrierwave:Video and FFMPEG to process videos with the help of delayed jobs.

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    include CarrierWave::Video::Thumbnailer
  
  
  
    # For carrierwave_backgrounder
  
    include ::CarrierWave::Backgrounder::Delay
  
  
  
    version :rescaled do
  
      process encode_video: [
  
        :mp4,
  
        resolution: "640x480", # Aspect ratio is preserved automatically
  
        audio_codec: "aac",
  
        custom: "-strict experimental -q:v 0 -preset slow -g 30",
  
        callbacks: { after_transcode: :set_success }
  
      ]
  
    end
  
  
  
  
  
    version :thumb do
  
      process thumbnail: [{format: 'png', quality: 10, size: 400, strip: true, logger: Rails.logger}]
  
      def full_filename for_file
  
        png_name for_file, version_name
  
      end
  
    end

  This is correct videos screenshot

  https://drive.google.com/open?id=1D0aNWcVxtL6DbTwBmWWIGzUUuyEyWNOG

  This the video screenshot after video process with FFMPEG

  https://drive.google.com/open?id=1vilExHoan2UuRPH9RbiZig58H1TwyewA

  (It’s like vertically pressed)

  ---

  Please help me, if you know a solution

• FFMpeg + Beanstalk : How to pass the processes to it

  14 juillet 2012, par Ilia Rostovtsev

  I'm working around on the video web site ! I have a simple PHP function that is used to start complicated conversion processes. The problem is that FFMpeg and Mencoder are extremely resourceful and having one process of it is something that makes httpd slow down but multiple processes just hang it completely. I want to my conversion processes with Beanstalk (or anything else). Everything is working well right now : converting, logging and etc.

  My concrete question is : How to transfer my current jobs to Beanstalk ?

  I have very simple PHP code :

  RunInBackground('convert.php', array($initial_file_name, $vid), $LogFilePath);

  And the function looks also quite clear :

  function RunInBackground($sPHPFile, $aParam = array(), $sLogFile = '')
  
  {
  
      global $config;
  
  
  
      $sCmd = $config['phppath'] . ' ' . $config['BASE_DIR'] . '/' . $sPHPFile;
  
      foreach ($aParam as $s)
  
      {
  
          $sCmd .= ' ' . $s;
  
      }
  
  
  
  
  
          $sCmd .= ' > ' . ($sLogFile != '' ? $config['BASE_DIR'] . '/' . $sLogFile : '/dev/null');
  
  
  
          if ( iBgProc($sCmd) )
  
          {
  
              return true;
  
          }
  
          else
  
          {
  
              return false;
  
          }
  
  
  
  }
  
  
  
  function iBgProc($sCmd, $iPrio = 0)
  
  {
  
      if ($iPrio)
  
      {
  
          $iPID = shell_exec("nohup nice -n $iPrio $sCmd 2> /dev/null & echo $!");
  
      }
  
      else
  
      {
  
          $iPID = shell_exec("nohup $sCmd 2> /dev/null & echo $!");
  
      }
  
  
  
      return($iPID);
  
  }

  Now what would Beanstalk correct code would look like so these processes would NOT start all at the same time if multiple videos are uploaded ?

  If you believe that for my needs is better to use something else but Beanstalk and you know how to implement it, I would be still happy to see it !

  Thanks !

• Cannot install snappy with brew - fatal error : 'cassert' file not found

  23 mars 2024, par kronus

  I am on an old mac - 10.14.6 - and I am trying to install ffmpeg via brew.

  


  I am finding errors during the make of snappy

  


  When I try to brew install snappy the same errors persist :

  


  ==> Installing dependencies for snzip: snappy&#xA;==> Installing snzip dependency: snappy&#xA;==> Patching&#xA;==> cmake . -DSNAPPY_BUILD_TESTS=OFF -DSNAPPY_BUILD_BENCHMARKS=OFF&#xA;==> make install&#xA;Last 15 lines from /Users/<home>/Library/Logs/Homebrew/snappy/02.make:&#xA;In file included from /tmp/snappy-20240323-80108-r3czy0/snappy-1.1.10/snappy.cc:29:&#xA;In file included from /tmp/snappy-20240323-80108-r3czy0/snappy-1.1.10/snappy-internal.h:34:&#xA;/tmp/snappy-20240323-80108-r3czy0/snappy-1.1.10/snappy-stubs-internal.h:40:10: fatal error: &#x27;cassert&#x27; file not found&#xA;40 | #include <cassert>&#xA;  |          ^~~~~~~~~&#xA;make[2]: *** [CMakeFiles/snappy.dir/snappy-sinksource.cc.o] Error 1&#xA;make[2]: *** Waiting for unfinished jobs....&#xA;1 error generated.&#xA;make[2]: *** [CMakeFiles/snappy.dir/snappy-c.cc.o] Error 1&#xA;1 error generated.&#xA;make[2]: *** [CMakeFiles/snappy.dir/snappy-stubs-internal.cc.o] Error 1&#xA;1 error generated.&#xA;make[2]: *** [CMakeFiles/snappy.dir/snappy.cc.o] Error 1&#xA;make[1]: *** [CMakeFiles/snappy.dir/all] Error 2&#xA;make: *** [all] Error 2&#xA;</cassert></home>