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# frozen_string_literal: true
module ActiveStorage
class Previewer::VideoPreviewer < Previewer
def self.accept?(blob)
blob.video?
end
def preview
download_blob_to_tempfile do |input|
draw_relevant_frame_from input do |output|
yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png"
end
end
end
private
def draw_relevant_frame_from(file, &block)
draw "ffmpeg", "-i", file.path, "-y", "-vcodec", "png",
"-vf", "thumbnail", "-vframes", "1", "-f", "image2", "-", &block
end
end
end
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