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