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https://github.com/mastodon/mastodon
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Video files with variable framerates are converted to constant framerate videos and the output framerate picked by ffmpeg is based on the original file's container framerate (which can be different from the average framerate). This means that an input video with variable framerate with about 30 frames per second on average, but a maximum of 120 fps will be converted to a constant 120 fps file, which won't be processed by other Mastodon servers. This commit changes it so that input files with VFR and a maximum framerate above the framerate threshold are converted to VFR files with the maximum frame rate enforced.
117 lines
3.9 KiB
Ruby
117 lines
3.9 KiB
Ruby
# frozen_string_literal: true
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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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@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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@vfr_threshold = options[:vfr_frame_rate_threshold]
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end
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def make
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metadata = VideoMetadataExtractor.new(@file.path)
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unless metadata.valid?
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Paperclip.log("Unsupported file #{@file.path}")
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return File.open(@file.path)
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end
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update_attachment_type(metadata)
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update_options_from_metadata(metadata)
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destination = Tempfile.new([@basename, @format ? ".#{@format}" : ''])
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destination.binmode
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@output_options = @convert_options[:output]&.dup || {}
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@input_options = @convert_options[:input]&.dup || {}
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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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@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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if high_vfr?(metadata) && !eligible_to_passthrough?(metadata)
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@output_options['vsync'] = 'vfr'
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@output_options['r'] = @vfr_threshold
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end
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end
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command_arguments, interpolations = prepare_command(destination)
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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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destination
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end
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private
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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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@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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command_arguments << '-i :source'
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interpolations[:source] = @file.path
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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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command_arguments << '-y :destination'
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interpolations[:destination] = destination.path
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[command_arguments, interpolations]
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end
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def update_options_from_metadata(metadata)
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return unless eligible_to_passthrough?(metadata)
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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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def high_vfr?(metadata)
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@vfr_threshold && metadata.r_frame_rate && metadata.r_frame_rate > @vfr_threshold
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end
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def eligible_to_passthrough?(metadata)
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@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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end
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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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