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# frozen_string_literal: true
module ActiveStorage
class Previewer::VideoPreviewer < Previewer
class << self
def accept?(blob)
blob.video? && ffmpeg_exists?
end
def ffmpeg_exists?
return @ffmpeg_exists if defined?(@ffmpeg_exists)
@ffmpeg_exists = system(ffmpeg_path, "-version", out: File::NULL, err: File::NULL)
end
def ffmpeg_path
ActiveStorage.paths[:ffmpeg] || "ffmpeg"
end
end
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
private
def draw_relevant_frame_from(file, &block)
draw self.class.ffmpeg_path, "-i", file.path, "-y", "-vframes", "1", "-f", "image2", "-", &block
end
end
end
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