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• FFMpeg - how to encode a F4M manifest file to mp4

  20 novembre 2015, par Roee

  I’m working on a project, where we want to encode flash videos to mp4 (for example, we want to encode a f4v file), and live-stream them (which means we can’t just download all the f4f files, then encode them to a single mp4 and just then stream it. The encoding and streaming has to be done while downloading the files).

  If the format of the flash video is flv for example, FFMpeg can do what I’ve described without any problem. I just give the address of the flv file to FFMpeg, and it encodes and streams it as mp4.

  But, if the format of the flash video is something more complicated as f4v (which gets downloaded as many f4f files), I don’t have a single url to give to FFMpeg as input - I have many addresses of f4f files. I don’t even know how many f4f files the video has before playing it - it looks like the flash player just fetches the next f4f file when needed.

  I read online that there is a manifest file (its extension is f4m), that "describes" to the flash player which f4f files it should download and play, and what’s their playing-order and everything.

  My question is - if I have the url of this f4m file, what should I do in order to encode all its f4f files to mp4 ?
  I’ve tried to give to FFMpeg just the f4m file as input, but it doesn’t know what to do with it...

  I’ll really appreciate any response that might help, as I’ve been working on this issue for few days now and I still haven’t found any answer...

  Thanks,
  Roee.

• How to record browser animation to video, on Server/VPS

  11 novembre 2015, par Andy B

  I have one big question : How to record an animation that plays in the browser on a server/VPS ? We’re looking for a open/source or even proprietary solution.

  The use-case :

  We have an online project that generates animations and we want to record them on the server side.
  Practically it’s as simple as that, as opening a url(eg : https://greensock.com/gsap) in the browser and record the animation.

  On the local PC it works if we use ffmpeg, but we want to record the video on the server side, especially on a VPS without GUI.

  There are some solutions :

  1. Install a Lightweight GUI on the VPS, accesible through VNC

  Something like this :
  https://vpsboard.com/topic/2786-running-a-lightweight-gui-on-your-vps/

  Then create a cron job that will do the following :

  • open the browser with the correct url and play the animation
  • use ffmpeg to record the animation
  • save the video somewhere

  This solution allows a SINGLE execution thread at the same time and I don’t really like the setup.

  2. Use a fake X server

  Create/use a fake X server, tell the browser to run in there, tell ffmpeg to record that screen !?

  The question is : HOW ?

  3. Virtual Machines within the VPS

  The question is : HOW ?

  I would like to have the possibility to execute this job in a sort of container (be it docker or virtual machines within the VPS), having also the possibility to execute multiple jobs in parallel.

  Thank you all in advance !

• RoutingError No route matches GET videos/original/missing.png

  4 novembre 2015, par D.Graves

  Okay so Im having an issue uploading videos using paperclip av transcoder. Im getting just a blank black image for my video and cant play anything. So no error pops up online but on my GitBash I see an ActionController Routing Error.

  This is the Error I see in my Gitbash
  

  My model that has the video :

  class Pin < ActiveRecord::Base
  
   belongs_to :user
  
   has_attached_file :video, :styles => {
  
  :medium => { :geometry => "640x480", :format => 'mp4' },
  
  :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
   }, :processors => [:transcoder]
  
  
  
  validates_attachment_content_type :video, :content_type => ["video/mp4",     "video.mov", "video/mpeg","video/mpeg4", "image/jpg", "image/jpeg"]
  
  
  
  end

  My show view for the video :

  <%= video_tag @pin.video.url %>
  
  
  
  <p>
  
   <strong>Description:</strong>
  
   &lt;%= @pin.description %>
  
  </p>
  
  
  
  &lt;% if @pin.user == current_user %>
  
  &lt;%= link_to 'Edit', edit_pin_path(@pin) %>
  
  &lt;% end %>
  
  &lt;%= link_to 'Back', pins_path %>

  I believe I installed ffmpeg correct and here is what it shows on my Gitbash for my version of ffmpeg

  

  I also have the newest version of paperclip and paperclip av transcoder installed. Am I just missing a route ? If you all need any other code to maybe help just let me know and ill post it