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58 lines
2.1 KiB
58 lines
2.1 KiB
# frozen_string_literal: true |
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class VideoMetadataExtractor |
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attr_reader :duration, :bitrate, :video_codec, :audio_codec, |
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:colorspace, :width, :height, :frame_rate, :r_frame_rate |
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def initialize(path) |
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@path = path |
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@metadata = Oj.load(ffmpeg_command_output, mode: :strict, symbol_keys: true) |
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parse_metadata |
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rescue Terrapin::ExitStatusError, Oj::ParseError |
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@invalid = true |
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rescue Terrapin::CommandNotFoundError |
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raise Paperclip::Errors::CommandNotFoundError, 'Could not run the `ffprobe` command. Please install ffmpeg.' |
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end |
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def valid? |
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!@invalid |
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end |
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private |
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def ffmpeg_command_output |
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command = Terrapin::CommandLine.new('ffprobe', '-i :path -print_format :format -show_format -show_streams -show_error -loglevel :loglevel') |
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command.run(path: @path, format: 'json', loglevel: 'fatal') |
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end |
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def parse_metadata |
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if @metadata.key?(:format) |
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@duration = @metadata[:format][:duration].to_f |
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@bitrate = @metadata[:format][:bit_rate].to_i |
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end |
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if @metadata.key?(:streams) |
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video_streams = @metadata[:streams].select { |stream| stream[:codec_type] == 'video' } |
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audio_streams = @metadata[:streams].select { |stream| stream[:codec_type] == 'audio' } |
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if (video_stream = video_streams.first) |
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@video_codec = video_stream[:codec_name] |
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@colorspace = video_stream[:pix_fmt] |
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@width = video_stream[:width] |
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@height = video_stream[:height] |
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@frame_rate = video_stream[:avg_frame_rate] == '0/0' ? nil : Rational(video_stream[:avg_frame_rate]) |
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@r_frame_rate = video_stream[:r_frame_rate] == '0/0' ? nil : Rational(video_stream[:r_frame_rate]) |
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# For some video streams the frame_rate reported by `ffprobe` will be 0/0, but for these streams we |
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# should use `r_frame_rate` instead. Video screencast generated by Gnome Screencast have this issue. |
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@frame_rate ||= @r_frame_rate |
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end |
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if (audio_stream = audio_streams.first) |
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@audio_codec = audio_stream[:codec_name] |
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end |
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end |
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@invalid = true if @metadata.key?(:error) |
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end |
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end
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