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• 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)
  
      }
  
  }

• 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.

• Create a video with other videos at certain points

  7 mars 2020, par Antique Chariot

  I’ve never used ffmpeg before, and I need to do something quite complicated (in my opinion at least, this could be easy).

  Basically I need to have a black video but at certain points concatenate other videos.
  For example, at 0.00 a 3 second video, then black until 10.0 and then another video, etc etc

  The finished videos will consist of hundreds of videos and be anywhere from 1-5 minutes long.

  I’m working in Node.js, ideally using a wrapper would be best (I’m using fluent-ffmpeg currently but any will suffice), although raw commands are also an option.

  Any ideas are appreciated !

  Edit : also, say a 5 second video is at 0.00, and a 10 second video is at 1.00, I’d like it to overwrite the original 5 second video