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@@ -0,0 +1,102 @@
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+# frozen_string_literal: true
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+
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+module Paperclip
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+ # This transcoder is only to be used for the MediaAttachment model
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+ # to check when uploaded videos are actually gifv's
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+ class Transcoder < Paperclip::Processor
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+ def initialize(file, options = {}, attachment = nil)
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+ super
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+
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+ @current_format = File.extname(@file.path)
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+ @basename = File.basename(@file.path, @current_format)
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+ @format = options[:format]
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+ @time = options[:time] || 3
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+ @passthrough_options = options[:passthrough_options]
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+ @convert_options = options[:convert_options].dup
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+ end
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+
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+ def make
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+ metadata = VideoMetadataExtractor.new(@file.path)
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+
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+ unless metadata.valid?
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+ log("Unsupported file #{@file.path}")
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+ return File.open(@file.path)
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+ end
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+
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+ update_attachment_type(metadata)
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+ update_options_from_metadata(metadata)
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+
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+ destination = Tempfile.new([@basename, @format ? ".#{@format}" : ''])
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+ destination.binmode
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+
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+ @output_options = @convert_options[:output]&.dup || {}
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+ @input_options = @convert_options[:input]&.dup || {}
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+
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+ case @format.to_s
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+ when /jpg$/, /jpeg$/, /png$/, /gif$/
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+ @input_options['ss'] = @time
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+
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+ @output_options['f'] = 'image2'
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+ @output_options['vframes'] = 1
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+ when 'mp4'
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+ @output_options['acodec'] = 'aac'
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+ @output_options['strict'] = 'experimental'
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+ end
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+
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+ command_arguments, interpolations = prepare_command(destination)
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+
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+ begin
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+ command = Terrapin::CommandLine.new('ffmpeg', command_arguments.join(' '), logger: Paperclip.logger)
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+ command.run(interpolations)
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+ rescue Terrapin::ExitStatusError => e
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+ raise Paperclip::Error, "Error while transcoding #{@basename}: #{e}"
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+ rescue Terrapin::CommandNotFoundError
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+ raise Paperclip::Errors::CommandNotFoundError, 'Could not run the `ffmpeg` command. Please install ffmpeg.'
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+ end
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+
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+ destination
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+ end
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+
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+ private
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+
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+ def prepare_command(destination)
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+ command_arguments = ['-nostdin']
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+ interpolations = {}
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+ interpolation_keys = 0
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+
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+ @input_options.each_pair do |key, value|
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+ interpolation_key = interpolation_keys
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+ command_arguments << "-#{key} :#{interpolation_key}"
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+ interpolations[interpolation_key] = value
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+ interpolation_keys += 1
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+ end
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+
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+ command_arguments << '-i :source'
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+ interpolations[:source] = @file.path
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+
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+ @output_options.each_pair do |key, value|
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+ interpolation_key = interpolation_keys
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+ command_arguments << "-#{key} :#{interpolation_key}"
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+ interpolations[interpolation_key] = value
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+ interpolation_keys += 1
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+ end
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+
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+ command_arguments << '-y :destination'
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+ interpolations[:destination] = destination.path
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+
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+ [command_arguments, interpolations]
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+ end
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+
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+ def update_options_from_metadata(metadata)
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+ return unless @passthrough_options && @passthrough_options[:video_codecs].include?(metadata.video_codec) && @passthrough_options[:audio_codecs].include?(metadata.audio_codec) && @passthrough_options[:colorspaces].include?(metadata.colorspace)
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+
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+ @format = @passthrough_options[:options][:format] || @format
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+ @time = @passthrough_options[:options][:time] || @time
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+ @convert_options = @passthrough_options[:options][:convert_options].dup
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+ end
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+
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+ def update_attachment_type(metadata)
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+ @attachment.instance.type = MediaAttachment.types[:gifv] unless metadata.audio_codec
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+ end
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+ end
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+end
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