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• ffmpeg not returning duration, cant play video until complete. Stream images 2 video via PHP

  17 février 2014, par John J

  I am real struggling with ffmpeg. I am trying to convert images to video, I have an ip camera which I am recording from. The recordings are mjpegs 1 frame per image.

  I am trying to create a script in php so I can recreate a video from date to date, this requires inputting the images via image2pipe and then creating the video.

  The trouble is, ffmpeg does return the duration and start stats, so I have no way of working out when the video is done or what percentage is done. The video won't play until its finished, and its not a very good UE.

  Any ideas of how I can resolve this, the video format can be anything I am open to suggestions.

  PHP :

  //Shell command
  
  exec('cat /image/dir/*.jpg | ffmpeg -y -c:v mjpeg -f image2pipe -r 10 -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart myvids/vidname.mp4 1>vidname.txt 2>&1')
  
  
  
  //This is loaded via javascript when the video is loaded (which is failing due to stats being wrong
  
  $video_play = "<video width="\&quot;320\&quot;" height="\&quot;240\&quot;" src="\&quot;myvids/vidname.mp4\&quot;" type="\&quot;video/mp4\&quot;\" controls="\&quot;controls\&quot;" preload="\&quot;none\&quot;"></video>";

  Javascript :

  //Javascript to create the loop until video is loaded
  
  <code class="echappe-js">&lt;script&gt;<br />
  
             $(document).ready(function() {<br />
  
                  var loader = $(&quot;#clip_load&quot;).percentageLoader();<br />
  
                  $.ajaxSetup({ cache: false }); // This part addresses an IE bug. without it, IE will only load the first number and will never refresh<br />
  
                  var interval = setInterval(updateProgress,1000);<br />
  
                  function updateProgress(){ $.get( &quot;&amp;#39;.base_url().&amp;#39;video/getVideoCompile_Process?l=&amp;#39;.$vid_name.&amp;#39;-output.txt&amp;amp;t=per&quot;, function( data ) { if(data=&gt;\&amp;#39;100\&amp;#39;){ $(&quot;#clip_load&quot;).html(\&amp;#39;&amp;#39;.$video_play.&amp;#39;\&amp;#39;); clearInterval(interval); }else{loader.setProgress(data); } });                    }<br />
  
              });<br />
  
              &lt;/script&gt;
  
  

  PHP (page is called via javascript :

  //This is the script which returns the current percentage
  
  $logloc = $this->input->get('l');
  
  $content = @file_get_contents($logloc);
  
  
  
  if($content){
  
      //get duration of source
  
      preg_match("/Duration: (.*?), start:/", $content, $matches);
  
  
  
      $rawDuration = $matches[1];
  
  
  
      //rawDuration is in 00:00:00.00 format. This converts it to seconds.
  
      $ar = array_reverse(explode(":", $rawDuration));
  
      $duration = floatval($ar[0]);
  
      if (!empty($ar[1])) $duration += intval($ar[1]) * 60;
  
      if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60;
  
  
  
      //get the time in the file that is already encoded
  
      preg_match_all("/time=(.*?) bitrate/", $content, $matches);
  
  
  
      $rawTime = array_pop($matches);
  
  
  
      //this is needed if there is more than one match
  
      if (is_array($rawTime)){$rawTime = array_pop($rawTime);}
  
  
  
      //rawTime is in 00:00:00.00 format. This converts it to seconds.
  
      $ar = array_reverse(explode(":", $rawTime));
  
      $time = floatval($ar[0]);
  
      if (!empty($ar[1])) $time += intval($ar[1]) * 60;
  
      if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;
  
  
  
      //calculate the progress
  
      $progress = round(($time/$duration) * 100);
  
      if ($this->input->get('t')=='per'){
  
          echo $progress;
  
      }else{
  
              echo "Duration: " . $duration . "<br />";
  
              echo "Current Time: " . $time . "<br />";
  
      echo "Progress: " . $progress . "%";}
  
  }else{ echo "cannot locate";}

  Thanks

• ffmpeg continous file stream or live stream

  17 novembre 2019, par shrw

  I work in a news channel. and the use case is little common.
  Where we have ads lined up. Let’s say 1000 ads in the entire day. ads are usually gif files overlay of 100 pixels X 500 pixels and usually less than 10 seconds.
  then we need to either play mp4 files or stream live content.
  What i really want is to :

  1. if we have 30 mp4 files to play in the entire day and 1000 gif overlay ads.
  2. Is it possible to switch(with the help of any coding languale like node.js or linux commands)
     streams from file to live stream.

• Scaling and stacking 2 videos

  31 octobre 2019, par Gambit2007

  I have 2 inputs and I want to scale, crop and put them on top of each other at the same time. My command should look something like this :

  ffmpeg -i input1 -i input2 -filter_complex crop=10000:5000:1000:0,scale=3840:1536 vstack output.mp4

  I know I need to use chaining (?) but I tried to look it up online and couldn’t really get it to work.

  So what would be the correct syntax the scale and crop both inputs and then put them vertically on top of each other while using ’-filter_complex’ only once ?