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• Raising and Rescuing Custom Exception

  24 décembre 2013, par cmw

  I'm using Rails 3 with Carrierwave and FFMPEG to handle video uploads and encoding.

  In my uploader, I'm using FFMPEG to grab the duration of the video from cache before storing it.

  I'd like to raise a custom exception if the video's duration exceeds a specific length and then route the user accordingly. I've spent quite a bit of time trying to figure out how to create, raise and rescue my own custom exceptions in Rails – but, I've had no luck.

  Some posts I've used to try to piece this together include this stack overflow post and this article on customized exception handling in Rails 3. I've had no luck yet.

  I'm hoping someone can offer guidance on the proper approach to this. My mind is blown.

  Below is what my uploader looks like :

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    before :store, :ffmpeg
  
  
  
    # Set storage type
  
    storage :fog
  
  
  
    # Override the directory where uploaded files will be stored.
  
    def store_dir
  
      "#{model.class.to_s.underscore}/videos/#{model.id}"
  
    end
  
  
  
    # Add a white list of extensions which are allowed to be uploaded.
  
    def extension_white_list
  
      %w(mov avi mp4 mkv wmv mpg)
  
    end
  
  
  
    def full_cache_path
  
      "#{::Rails.root}/public/#{cache_dir}/#{cache_name}"
  
    end
  
  
  
    private 
  
  
  
    def ffmpeg(*args)
  
      @model.video.cache_stored_file!
  
      movie = FFMPEG::Movie.new("#{model.video.full_cache_path}")
  
      if movie.duration > 600
  
        raise "my custom exception will go here one day"
  
      end
  
    end
  
  
  
  end

• How to specify the path of the ffmpeg binary

  24 novembre 2015, par zaki ahmad

  Same question almost
  What is the correct path video using Streamio FFMPEG on Rails

  In it they say

  This gem assumes ffmpeg is available in your PATH. If it is not in your PATH, You need to specify the path of the ffmpeg binary.

  FFMPEG.ffmpeg_binary = '/usr/local/bin/ffmpeg'

  I follow this gem https://github.com/streamio/streamio-ffmpeg , then I do this :

  movie = FFMPEG::Movie.new("#{self.videod.path}")

  But the error is

  Errno::ENOENT: No such file or directory - the file '/home/des0071/practise/test_api/public/system/ads/videods/000/000/002/original/SampleVideo_1080x720_1mb.mp4' does not exist

  How I specify ffmpeg path ?What I do ?

• Importing FFMPEF Generated file into imovie

  14 mai 2023, par saurav tripathi

  I am generating a .mp4 file using command

  


  ffmpeg  -i input.png -i input.mp3 -vcodec libx264 \ -vf scale=1920:1080,format=yuv420p  -c:v prores_aw movie1.mov


  


  It generate a video. I am able to open the video in quick time player without any problem, but when I try to import the video in imove, the size of the video changes to 0.1s. The length of the generated video from ffmpeg command is about 11 seconds. How do I fix this problem.

  


  I am trying to generate a movie file combining a .png file and a .mp3 file using ffmpeg, I was able to generate a movie which was about 11 seconds, I was able to open the file in quick time players, but when I try to import the video in imovies, or Davinci resolve, then it doesn't shows me an error, but the length of the video turn out to be just 0.1 seconds.