Recherche avancée

Sur d’autres sites (6598)

• Unable to upload/convert videos using Paperclip-FFMPEG gem in Rails

  31 juillet 2012, par Graeme

  FIXED : It's due to a typo in the relevant lib file that I hadn't spotted ! See this issue for more details.

  ---

  I'm still a bit of a Ruby on Rails newbie (running Rails 3.2.6 and Ruby 1.9.3p194), but I'm finding it very difficult to convert video files using the paperclip-ffmpeg gem. No matter what I do, an error message is displayed on the page after attempting to upload the video :

  "cannot load such file : /[...My info...]/lib/paperclip_processors/ffmpeg.rb"

  I'm trying to test using .mov files for the moment.

  I'm trying to follow the instructions on the gem's github page, but without much success.

  Firstly, I'm using a Mac (Snow Leopard) and ffmpeg is installed (running which ffmpeg tells me it's in /user/local/bin/ffmpeg)

  In my application, I've added the following lines to the gemfile :

  gem 'paperclip'
  
  gem 'paperclip-ffmpeg' 

  I've also added Paperclip.options[:command_path] = "/usr/local/bin/" to config/environments/development.rb as per the instructions :

  Myapp::Application.configure do
  
  
  
  ...
  
  
  
  Paperclip.options[:command_path] = "/usr/local/bin/"
  
  end

  (The instructions also suggest "in your environment config file, let Paperclip know to look there by adding that directory to its path", but I don't know what this means - maybe this is the problem ?).

  My class is structured as follows :

  class Myvideo > ActiveRecord::Base
  
  
  
    attr_accessible :description, :title, :video
  
  
  
    has_attached_file :video, :styles => { 
  
        :medium => { :geometry => "640x480", :format => 'flv' }
  
      }, :processors => [:ffmpeg]
  
  
  
  
  
  end

  My understanding is that the above code converts the uploaded movie from .mov (or whatever) to .flv format.

  However, the error I describe above appears whenever the user clicks on the Upload button (save for a few seconds while the video appears to be uploading).

  Note that I can upload a video via the standard Paperclip gem without converting with no problems. Therefore, this code works (i.e. the video is uploaded but no conversion occurs) :

  attr_accessible :description, :title, :video
  
  
  
    has_attached_file :video

  Any ideas where I might be going wrong ? Thanks !

  ---

  EDIT - the original error message ("Cannot load such file...") appears to have arisen because I hadn't included the relevant ffmpeg.rb file from Github within the /lib directory. Thanks to @wehal3001 for pointing this out !

  However, while I now have this file in my application, I still get the following error when trying to upload a video :

  uninitialized constant Paperclip::Ffmpeg::PaperclipError
  ...
  lib/paperclip_processors/ffmpeg.rb:123:in

  rescue in make'
lib/paperclip_processors/ffmpeg.rb:120:in

  make'
  app/controllers/videos_controller.rb:43:in

  new'
app/controllers/videos_controller.rb:43:in

  create'

  Any help would be much appreciated !

• Converting video formats and copying tags with ffmpeg

  21 mai 2016, par Scott

  I’ve been trying to convert some videos I took on my camera to a compressed format in order to save some storage space. I figured out how to use ffmpeg to convert the videos to the format I want, but what I haven’t been able to figure out is how to copy the metadata. I’d like to copy the original metadata from when the video was taken (most importantly the creation time). I’ve tried running ffmpeg using the -map_meta_data 0:0 option, but that didn’t seem to work. Any ideas ?

  It looks like the data I want to copy in this case is in the format section of the video. Using ffprobe with the show_format option, I get this output :

  [FORMAT]
  
  filename=video.AVI
  
  nb_streams=2
  
  format_name=avi
  
  format_long_name=AVI format
  
  start_time=0.000000
  
  duration=124.565421
  
  size=237722700
  
  bit_rate=15267331
  
  TAG:creation_time=2012-02-07 12:15:27
  
  TAG:encoder=CanonMVI06
  
  [/FORMAT]

  I would like to copy the two tags to my new video.

• Linux/bash - ffmpeg - encode file with half bitrate and half resolutio

  3 octobre 2014, par user1209216

  I have some video file. I need to re-encode this in this way :
   result file bitrate is 2x lower than original
   result file resolution is 2x lower (witdth and height)
   audio codec - copied from source, video codec : h264

  I know how to encode with hardcoded bitrate/resolution and audio copy. However, I have no idea how to make that values as half of input file parameters. Can I do this with ffmpeg ?