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• Sequelize FFMPEG get video after upload on NodeJs

  30 juin 2020, par jjplack

  Hello After upload a video to db using sequelize, i would like to edit it using FFMPEG

  


  So to get the video is just point the model attribute to FFMPEG ?

  


  Because using the file path is not editing the video.

  


  For exemple :

  


  fastify.route({
    method: "POST",
    url: "/posts",
    preHandler: upload.single("video"),

    handler: async function(request, reply) {
      const { Post } = fastify.sequelize;

      const videoPath = "./public/uploads/";

 

     

      const post = await Post.create({
        video: request.file.path,
        title: request.body.title,
   
      });
      reply.code(201).send(post);


 

try {
   const process = new ffmpeg(post.video);
  process.then(function (video) {
    video.addCommand('-ss', '00:01:00')
    video.addCommand('-vframes', '1')
    video.save(videoPath, function (error, file) {
        if (!error)
          console.log('Video file: ' + file);
      });
  }, function (err) {
    console.log('Error: ' + err);
  });
} catch (e) {

  console.log(e.msg);

}
      
    }
  });


  


• Rails generate dynamic ffmpeg command

  13 janvier 2024, par Seto

  I'm trying to combine several videos into one with ffmpeg command called from a Ruby script in a Rails ActionJob class. The number of input videos is unlimited. This is how I did it right now.

  


   def perform(project_id)
    @project = Project.find(project_id)
    logger.info 'ProjectGenerateVlogJob#perform'
    logger.debug "project: #{@project.inspect}"
    setup_directory

    result_filename = "#{@project.id}-vlog.mp4"
    execute_command = <<-FFMPEG
      find *.mp4 | sed 's:\ :\\\ :g'| sed 's/^/file /' > fl.txt; ffmpeg -f concat -i fl.txt -c copy #{result_filename}; rm fl.txt
    FFMPEG

    logger.debug "ffmpeg_command: #{execute_command}"
    `#{execute_command}`
  end


  


  But that command is not stable, in a way that the generated video has problems, namely un-synch audio, video gets cut off, etc.

  


  This is how I did it through the console manually that produced the best result so far :

  


  $ ffmpeg -i IMG_1-same.MOV -i IMG_2-same.MOV -i IMG_3-same.MOV \
-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] \
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]" -vsync vfr vlog-1.mp4


  


  The thing is, I don't know how to generate the command dynamically so it can be run by the Ruby script. Any pointers ?

  


  The Project model has many videos, and when I looped through it it produced multiple lines of command and it's not a valid command when I run it from Ruby.

  


• aacpsy : Add energy spread for each band

  26 juin 2015, par Rostislav Pehlivanov

  aacpsy : Add energy spread for each band
  This commit adds the energy spread to the struct for each band and removes 2 unused fields.
  
  distortion and perceptual_weight were not referenced in any file nor were they set to any value,
  
  so it was safe to remove them. The energy spread is currently only used in the aac psy model.
  
  It’s defined as being proportional to the tonality of each band.
  Reviewed-by : Claudio Freire <klaussfreire@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/aacpsy.c
  • [DH] libavcodec/psymodel.h