carrierwave-video-thumbnailer

A thumbnailer plugin for Carrierwave. It mixes into your uploader setup and makes easy thumbnailing of your uploaded videos. This software is quite an alpha right now so any kind of OpenSource collaboration is welcome.

ffmpegthumbnailer binary should be present on the PATH.

ffmpegthumbnailer git repository

gem install carrierwave-video-thumbnailer

Or add to your Gemfile:

gem 'carrierwave-video-thumbnailer'

If you need resize thumbnail add RMagick or MiniMagic

0. Install ffmpegthumbnailer

   linux

    sudo apt install ffmpegthumbnailer
   

   MacOS

    brew install ffmpegthumbnailer  
   

1. Create migration for your model:

    rails g migration add_video_to_your_model video:string
   

2. Generate uploader

    rails generate uploader Video
   

3. Mount uploader in model

    class YourModel < ApplicationRecord
      mount_uploader :video, VideoUploader
    end
   

4. Update your uploader

   In your Rails app/uploaders/video_uploader.rb:

   class VideoUploader < CarrierWave::Uploader::Base
       include CarrierWave::Video  # for your video processing
       include CarrierWave::Video::Thumbnailer
       
       storage :file
       
       def store_dir
         "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
       end
       
       version :thumb do
         process thumbnail: [{format: 'png', quality: 10, size: 192, strip: true, logger: Rails.logger}]
       
         def full_filename for_file
           png_name for_file, version_name
         end
       end
       
       def png_name for_file, version_name
         %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.png}
       end
   end

   For resize thumbnail add version:

       class VideoUploader < CarrierWave::Uploader::Base
          include CarrierWave::MiniMagick
       
          ...
       
          version :small_thumb, from_version: :thumb do
            process resize_to_fill: [20, 200]
          end
    
       end

5. Don't forget add parameter in controller

     def post_params
       params.require(:post).permit(:title, :body, :video)
     end

6. Add image_tag to your view

   erb example

    <%= image_tag(@post.video.thumb.url, alt: 'Video') if @post.video? %>
   

Runs ffmpegthumbnailer with CLI keys provided by your configuration or just uses quite a reasonable ffmpegthumbnailer's defaults.

The options are passed as a hash to the thumbnail processing callback as shown in the example. The options may be, according to ffmpegthumbnailer's manual:

• format: 'jpg' or 'png' ('jpg' is the default).
• quality: image quality (0 = bad, 10 = best) (default: 8) only applies to jpeg output
• size: size of the generated thumbnail in pixels (use 0 for original size) (default value: 128 and keep initial aspect ratio).
• strip: movie film strip decoration (defaults to false).
• seek: time to seek to (percentage or absolute time hh:mm:ss) (default: 10)
• square: if set to true ignore aspect ratio and generate square thumbnail.
• workaround: if set to true runs ffmpegthumbnailer in some safe mode (read man ffmpegthumbnailer for further explanations).
• logger: an object behaving like Rails.logger (may be omitted).

For disable film stripes in thumbnail check strip to false

process thumbnail: [{format: 'png', quality: 10, size: 192, strip: false, logger: Rails.logger}]

Please read Code of Conduct and Contributing Guidelines for submitting pull requests to us.

We use SemVer for versioning. For the versions available, see the tags on this repository.

The changelog is here.

• Pavel Argentov - Initial work

See also the list of contributors who participated in this project.

This project is licensed under the MIT License.

Huge Thanks to Rachel Heaton (https://github.com/rheaton) whose carrierwave-video gem has inspired me (and where I've borrowed some code as well).