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• lavd/x11grab : fix vertical repositioning

  28 mars 2019, par Octavio Alvarez

  lavd/x11grab : fix vertical repositioning
  There is a calculation error in xcbgrab_reposition() that breaks
  
  vertical repositioning on follow_mouse. It made the bottom
  
  reposition occur when moving the mouse lower than N pixels after
  
  the capture bottom edge, instead of before.
  This commit fixes the calculation to match the documentation.
  follow_mouse : centered or number of pixels. The documentation says :
  When it is specified with "centered", the grabbing region follows
  
  the mouse pointer and keeps the pointer at the center of region ;
  
  otherwise, the region follows only when the mouse pointer reaches
  
  within PIXELS (greater than zero) to the edge of region.
  

  • [DH] libavdevice/xcbgrab.c

• Parsing the STDERR output of node.js child_process line by line

  3 janvier 2012, par primer

  I'm writing a simple online conversion tool using FFMPEG and Node.js. I'm trying to figure out how to parse each line of the conversion output received from FFMPEG and only display pertinent results client side in the browser. In my case I want the encoding time counter that FFMPEG spits out on the command line.

  My function thus far is :

  function metric(ffmpeg, res) { 
  
  
  
    ffmpeg.stdout.on('data', function(data) {
  
       res.writeHead(200, {'content-type': 'text/html'});
  
       res.write('received upload:\n\n');
  
       console.log(data);
  
    });
  
  
  
    ffmpeg.stderr.on('data', function (data) {
  
       var temp += data.toString();
  
              var lines = temp.split('\n');
  
  
  
              //for debugging purposes
  
              for(var i = 0;icode>

  What this ends up returning is multiple arrays, each of which includes the data from the previous array as well as the next data chunk. For example, the function returns array 1 :0=>A, 1=>B, array 2 :0=>A, 1=>B, 2=>C, array 3 :0=>A, 1=>B, 2=>C, 3=>D, and so on.

  I'm quite new to Node so I'm probably missing something simple. Any guidance would be much appreciated !

• Ffmpeg compression cron cutting video to 1 second

  6 août 2022, par BlackThorn

  I have a cron setup to take locally uploaded videos, create a screengrab, compress the video and upload to online storage. I am using ffmpeg with php and have tried a few different ways but though it does compress the file size I keep getting a saved file of just the first second of the video. I tried delaying the process in case it just didn't have enough time to do the video and that was the cause but it didn't seem to do much. Here are some of the examples of the code I've tried all together (commented out as tried each but you can see the different ways) :

  


  try {
    // compress video if needed
    $bitrate = "5000k";
    // $command = "ffmpeg -i ".($temp_dir."/".$folder."/".$sub_file)." -b:v $bitrate -bufsize $bitrate ".$temp_dir."/".$folder."/edit-".$sub_file;
    // $command = "ffmpeg -i $temp_video -qscale 0 ".$temp_dir."/".$folder."/edit-".$sub_file;
    $command = "ffmpeg -i ".($temp_dir."/".$folder."/".$sub_file)." -vf scale=1280:-1 -c:v libx264 -preset veryslow -crf 24 ".$temp_dir."/".$folder."/edit-".$sub_file;
    //system($command);
    $output=null;
    $retval=null;
    exec($command, $output, $retval);
    $temp_video = $temp_dir."/".$folder."/edit-".$sub_file."";
} catch (Exception $e) {
    // log output
}


  


  Is there a known issue with this or something I'm missing ?

  


  Thanks