VideoThumbnailer

A thumbnailer plugin for Carrierwave. This can be used to generate thumbnails for videos uploaded with carrier-wave.

Installation

Add this line to your application's Gemfile:

gem 'video_thumbnailer'

And then execute:

$ bundle

Or install it yourself as:

$ gem install video_thumbnailer

Usage

In the Rails app/uploaders/filename.rb, call the generate_thumb function with options. The options are passed as hash to this function, can be also empty.

The options are:

• size - The height x width of the thumbnail to be generated, by default will take the same size of that of the video, type is string.
• file_extension - Format of the file to be saved, by default the format at will be "jpeg", type is string.
• rotate - Orientation of the thumbnail image generated(Can be 90/180/270), type is integer.
• quality - Quality of the file to be saved, type is integer.
• time_frame - The time in the video at which the thumbnail must be generated, type is string.

Examples

Here's a working example:

In your Rails app/uploaders/video_uploader.rb:

class VideoUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick
  include VideoThumbnailer
  storage :file

  version :thumb do
     process generate_thumb:[{size:"200 x 200",:quality => 5, :time_frame => "00:0:04", :file_extension => "jpeg", :rotate => 180 }]
    def full_filename for_file
      png_name for_file, version_name, "jpeg"
    end
  end

  def png_name for_file, version_name, format
    %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.#{format}}
  end

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  def extension_white_list
    %w( mp4 jpg jpeg gif png )
  end

end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake false to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/video_thumbnailer. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.