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• How to transcode flash movie to mp4, then upload to s3

  13 octobre 2017, par user1790300

  I am using the fluent-ffmpeg library with node.js to transcode videos originally in a flash movie format to the mp3 format with multiple resolutions, 1080p, etc.. Once the transcoding is complete, I would like to move the transcoded video to an s3 bucket.

  I pull the original .flv file from a source s3 bucket and pass the stream to the ffmpeg constructor function. The issue is after the transcoding completes, how do I then get the stream of the mp4 data to send to s3.

  Here is the code I have so far :

          var params = {
  
              Bucket: process.env.SOURCE_BUCKET,
  
              Key: fileName
  
          };
  
          s3.getObject(params, function(err, data) {
  
              if (err) console.log(err, err.stack); // an error occurred
  
  
  
              var format = ffmpeg(data)
  
              .size('854x480')
  
              .videoCodec('libx264')
  
              .format('flv')
  
              .toFormat('mp4');
  
              .on('end', function () {
  
                  //Ideally, I would like to do the uploading here
  
  
  
                  var params = {
  
                     Body: //{This is my confusion, how do I get the stream to add here?},
  
                     Bucket: process.env.TRANSCODED_BUCKET,
  
                     Key: fileName
  
                  };
  
                  s3.putObject(params, function (err, data) {
  
  
  
                 });
  
              })
  
              .on('error', function (err) {
  
                  console.log('an error happened: ' + err.message);
  
              });
  
  
  
          });

  For the code above, where can I get the transcoded stream to add to the "Body" property of the params object ?

• Using ffmepg wrapper to convert images to movie file

  24 mai 2020, par reborn

  I have recently been using the ffmpeg wrapper by Vitaliy Fedorchenko called NReco.VideoConverter. It's pretty great and I have managed to write another application with it that I hope to release soon after some testing and I purchase the license for the wrapper (it's a cool watermarker for videos).

  



  I am now trying to use that same wrapper to encode a video from still images, but sadly there is very little documentation available and I am feeling my way int he dark a little. I am hopeful that someone familiar with the wrapper might be able to help.

  



  I collect the images using the fileOpenDialogue and picking images to populate a listView. When I am ready, I then take these images to build an array and create the movie.

  



  application picture

  



      void ConvertToMovie()
    {
        if(listImages.Items.Count > 1)
        {
            var ffMpeg = new NReco.VideoConverter.FFMpegConverter();

            NReco.VideoConverter.FFMpegInput[] ffMpegInputs = new NReco.VideoConverter.FFMpegInput[listImages.Items.Count]; 

            for (int i = 0; i < listImages.Items.Count; i++)
            {
                var SSAImage = new NReco.VideoConverter.FFMpegInput(listImages.Items[i].SubItems[2].Text.ToString());
                ffMpegInputs[i] = SSAImage;
            }


            ConvertSettings csettings = new ConvertSettings();
            csettings.SetVideoFrameSize((int)MovieWidth.Value, (int)MovieHeight.Value);
            csettings.VideoFrameCount = listImages.Items.Count;
            csettings.VideoFrameRate = (int)FPS.Value;

            /*
            string argument = " -profile:v high ";
            csettings.CustomOutputArgs = argument;
            */

            if (FormatChooser.SelectedIndex == 0)
            {
                //This just takes the first picture and converts that single frame into a movie.
                ffMpeg.ConvertMedia(ffMpegInputs, @"Converted.avi", Format.avi, csettings);
                //ffMpeg.ConvertMedia(listImages.Items[0].SubItems[2].Text.ToString(), ffMpegInput.Format, @"Converted.avi", Format.avi, csettings);
            }
        }
        else
        {
            MessageBox.Show("You need at least two images to make a movie.", Title);
        }
    }


  



  Passing the images as an array to the function seems logical. At list of the methods are here : https://www.nrecosite.com/doc/NReco.VideoConverter/

  



  However, the only method that allows you to pass an array of the inputs is here :
https://www.nrecosite.com/doc/NReco.VideoConverter/html/M_NReco_VideoConverter_FFMpegConverter_ConvertMedia.htm

  



  So this makes sense to me that it would be the one to use.

  



  This does generate a .avi file, but the movie only contains the first frame from the array.

  



  I saw someone else had the same issue here : Nreco video converter make video from image sequence

  



  However, the responses seemed to suggest using a different method that allows you to pass a single image file only, then somehow the ffmpeg.exe will sequence the rest of them ? I couldn't get that to work at all.

  



  At this stage the only way I can see of making it work is creating a single frame movie file for each frame, and then concating all of the movie files together using :

  



  https://www.nrecosite.com/doc/NReco.VideoConverter/?topic=html/M_NReco_VideoConverter_FFMpegConverter_ConcatMedia.htm

  



  That's a pretty ridiculous notion though.

  


• lavfi/movie : Use filter thread count for decoding threads.

  25 août 2019, par Carl Eugen Hoyos

  lavfi/movie : Use filter thread count for decoding threads.
  Fixes ticket #7542.
  

  • [DH] libavfilter/src_movie.c