Video thumbnails

You can extract thumbnails from videos with ImageMagick via the command below, where [1] denotes which frame to capture the image from.

convert input.mp4[1] thumbnail.jpg

To create a thumbnail from a video using paperclip, define your preferred sizes in your initial has_attached_file call:

class User < ActiveRecord::Base
  # Paperclip
  has_attached_file :photo,
    :styles => {
      :thumb => "100x100#",
      :small  => "150x150>",
      :medium => "200x200" }
end

For more on thumbnails see [Thumbnail Generation](Thumbnail Generation)

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It is important to note that ImageMagick does not handle the thumbnail extraction directly. It delegates the extraction to the ffmeg library. If ffmpeg is not installed paperclip will raise Validation failed: Asset Paperclip::Errors::NotIdentifiedByImageMagickError.