Class: ActiveStorage::Previewer::VideoPreviewer

Inherits:
ActiveStorage::Previewer show all
Defined in:
lib/active_storage/previewer/video_previewer.rb

Instance Attribute Summary

Attributes inherited from ActiveStorage::Previewer

#blob

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from ActiveStorage::Previewer

#initialize

Constructor Details

This class inherits a constructor from ActiveStorage::Previewer

Class Method Details

.accept?(blob) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_storage/previewer/video_previewer.rb', line 6

def accept?(blob)
  blob.video? && ffmpeg_exists?
end

.ffmpeg_exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_storage/previewer/video_previewer.rb', line 10

def ffmpeg_exists?
  return @ffmpeg_exists if defined?(@ffmpeg_exists)

  @ffmpeg_exists = system(ffmpeg_path, "-version", out: File::NULL, err: File::NULL)
end

.ffmpeg_path ⇒ Object 



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# File 'lib/active_storage/previewer/video_previewer.rb', line 16

def ffmpeg_path
  ActiveStorage.paths[:ffmpeg] || "ffmpeg"
end

Instance Method Details

#preview ⇒ Object 



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# File 'lib/active_storage/previewer/video_previewer.rb', line 21

def preview
  download_blob_to_tempfile do |input|
    draw_relevant_frame_from input do |output|
      yield io: output, filename: "#{blob.filename.base}.jpg", content_type: "image/jpeg"
    end
  end
end