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• Silence out quiet periods in audio file with ffmpeg

  11 août 2015, par nolt2232

  I’m using ffmpeg to do some audio processing on phone calls. The raw calls have a left and right channel and my desired result is two mono files, one for each channel. I was able to use ffmpeg’s map_channel to split the file by channel but I’m noticing the resulting files have a bit of cross talk that I would like to remove.

  Each channel has the primary speaker talking very loud and clear but you can also hear the person from the other channel talking very quietly. I’d like to silence out these sections of the audio (i.e. make them perfectly silent but not remove them as I want to preserve the original length and pauses in the audio).

  Does ffmpeg have a filter I can use to convert periods of low volume (or some other measurement that would isolate these sections of the recording) into total silence ?

• How to install ffmpeg in my linux VPS [on hold]

  12 décembre 2015, par Mourad karoudi

  I want to install ffmpeg in my vps but how to do that.
  I search in google and here but i find a lot of people talk about (yum).
  but how I can find yum in vps.
  I use cpanel 11.52.1 (build 3).
  I use this below code (in local server windows).

  $ffmpeg = "C:\\bin\\ffmpeg";
  
  $xyz = shell_exec("$ffmpeg -i \"{$video_tmp}\" 2>&1");
  
  $search='/Duration: (.*?),/';
  
  preg_match($search, $xyz, $matches);
  
  $explode = explode(':', $matches[1]);
  
  $sec = $explode[2];
  
  $str_sec = strlen($sec) > 2 ? substr($sec,0,2)."" : $sec;
  
  $time = $explode[1].':'.$str_sec;
  
      $videoFile = $_FILES["video"]["tmp_name"];
  
      $size = "840x480";
  
      $thum_tar = "thumbnails/".$video_secure."-thumbnails";
  
      shell_exec("$ffmpeg -ss 20 -i $videoFile  -an -s $size $thum_tar.jpg");

  please help me.

• Video upload size

  16 mai 2014, par Jonas m

  I’m having a hard time figuring this one out, so hopefully, some of you who has tried this before, will take the time to reply and share your knowledge.

  I’m working on a site, which after release, will be feeded in the television and other commercial places. The site asks the user to upload a video with a story, and we expect alot of people to do so.

  My problem is the whole storage/space talk. A normal, unencoded iPhone recording easily fills around 100-120 MB for a minute or two.

  I’ve tried setting up and using FFMPEG to re-encode the movies, but the problem is, that one encoding sucks up 100% of the CPU, leaving the site inaccisible for anybody else.

  Is there anything you could suggest, which would be sufficient for such a site ? The client is on a budget, so price is a consideration aswell. Best of all would be a free alternative to etc. FFMPEG, but with less CPU usage.

  My specs are as follows
  CentOs 6 on a
  1GB ram DigitalOcean cloud service with nginx + php-fpm and mysql.

  Im hoping for some cleaver folks to answer this !
  Thanks in advance.
  Jonas