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• Convert video with paperclip and ffmpeg in Ruby on Rails

  16 juin 2014, par Atu

  I want to convert my uploaded video with ffmpeg, but I had few error. I use paperclip and ffmpeg but nothing happen. The structure of my application is one post has_many videos.

  this my video model :

  belongs_to :event
  
  validates_attachment_presence :source
  
  has_attached_file :source
  
  
  
  after_create :convert_in_flv, :set_new_filename
  
  
  
  def convert_in_flv
  
    flv = File.join(File.dirname(source.path), "#{id}.flv")
  
    system("ffmpeg -i #{source.path} -ar 22050 -ab 32 -s 480x360 -vcodec flv -r 25 -qscale 8 -f flv -y #{flv}")
  
  end
  
  
  
  def set_new_filename
  
    update_attribute(:source_file_name, "#{id}.flv")
  
  end

  and this my video controller

  def create
  
    @event = Event.find(params[:event_id])
  
    @video = @event.videos.create(params[:video])
  
    redirect_to event_path(@event)
  
  end 
  
  
  
  def destroy
  
    @event = Event.find(params[:event_id])
  
    @video = @event.videos.find(params[:id])
  
    @video.destroy
  
    redirect_to event_path(@event)
  
  end

  The video is successful upload but not converted. You had any solution ?

• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.

• Video error while processing

  19 décembre 2012, par joelmaranhao

  Trying out paperclip-ffmpeg gem with Rails 3.1

  In my model

  class Video < ActiveRecord::Base
  
    belongs_to :creative_service
  
  
  
    has_attached_file :asset, :styles => { 
  
      :medium => { :geometry => "640x480", :format => 'flv' },
  
      :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
    }, :processors => [:ffmpeg]
  
  end

  The error message when uploading a MPG file :

  Video error while processing video for MOV0652220121219-19138-1ybt1gp: Command 'ffmpeg -i :source -y -s 640x480 :dest' returned 1. Expected 0

  I am a total newbie with video processing. Any hint is welcome.

  j.