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• ffmpeg how to crop and scale at the same time ?

  13 décembre 2018, par Mitchell Faas

  I’m trying to convert a video with black bars, to one without and if the source is 4k, I want the video to be converted to 1080p

  Now to do this, I’m using the following command :*

  ffmpeg -i input ... -filter:v "crop=..." -filter:V "scale=1920:-1" ouput

  But running this, I found that the end product still has said black bars and is 1920x1080 as opposed to the 1920x800 I’d expect.

  What gives, why does this not work ?

  * : Other settings have been left out for convenience.

• how to make videothumbnail from the middle of the video ?

  28 décembre 2019, par Shahrzad Nazemi

  I am using ffmpeg as my module in Node js app for making video thumbnails.the thing is , it makes it from the beginning of the Video. and some of them begins with a black frame so the thumbnail will be a black picture.I want to know how should I make it from the middle of the video so that they wont be black anymore.
  here is what I did :

  module.exports.createVideoThumbnail = function (path, destination, fileName, cb) 
  
  {
  
      try 
  
      {
  
          var process = new ffmpeg(path);
  
          process.then(function (video) {
  
              video.fnExtractFrameToJPG(destination, {
  
                  frame_rate: 1,
  
                  number: 1,
  
                  start_time: 20,
  
                  duration_time: 1,
  
                  file_name: `${fileName}`
  
              }, function (error, files) {
  
                  if (!error) 
  
                  {
  
                      console.log('Frames: ');
  
                      cb(1)
  
                  }
  
                  else 
  
                  { console.log(error); cb(-1); }
  
              });
  
  
  
          }, function (err) {
  
              console.log('Error: ' + err);
  
              cb(-1)
  
          });
  
      } 
  
      catch (e) 
  
      {
  
          console.log(e.code);
  
          console.log(e.msg);
  
          cb(-1)
  
      }
  
  }

• Reformat an output in Bash

  5 février 2017, par Kenneth

  I’m using this ffmpeg argument to get the black frame in a file :

  ffmpeg -i ${arrayDesFichiers[$i]} -vf "blackdetect=d=3:pix_th=0.00" -an -f null - 2>&1 | grep black_duration >> log.txt

  Now I’m getting this in my log.txt :

  [blackdetect @ 0x7fd9add06bc0] black_start:0 black_end:3.2 black_duration:3.2

  And I would like to reformat it to something like this :

  black duration : 3.2 seconds

  I’m pretty sure it’s possible in Bash but how ?