forked from treehouse/mastodon
55 lines
1.7 KiB
Ruby
55 lines
1.7 KiB
Ruby
|
# frozen_string_literal: true
|
||
|
|
|
||
|
|
class VideoMetadataExtractor
|
||
|
|
attr_reader :duration, :bitrate, :video_codec, :audio_codec,
|
||
|
|
:colorspace, :width, :height, :frame_rate
|
||
|
|
|
||
|
|
def initialize(path)
|
||
|
|
@path = path
|
||
|
|
@metadata = Oj.load(ffmpeg_command_output, mode: :strict, symbol_keys: true)
|
||
|
|
|
||
|
|
parse_metadata
|
||
|
|
rescue Terrapin::ExitStatusError, Oj::ParseError
|
||
|
|
@invalid = true
|
||
|
|
rescue Terrapin::CommandNotFoundError
|
||
|
|
raise Paperclip::Errors::CommandNotFoundError, 'Could not run the `ffprobe` command. Please install ffmpeg.'
|
||
|
|
end
|
||
|
|
|
||
|
|
def valid?
|
||
|
|
!@invalid
|
||
|
|
end
|
||
|
|
|
||
|
|
private
|
||
|
|
|
||
|
|
def ffmpeg_command_output
|
||
|
|
command = Terrapin::CommandLine.new('ffprobe', '-i :path -print_format :format -show_format -show_streams -show_error -loglevel :loglevel')
|
||
|
|
command.run(path: @path, format: 'json', loglevel: 'fatal')
|
||
|
|
end
|
||
|
|
|
||
|
|
def parse_metadata
|
||
|
|
if @metadata.key?(:format)
|
||
|
|
@duration = @metadata[:format][:duration].to_f
|
||
|
|
@bitrate = @metadata[:format][:bit_rate].to_i
|
||
|
|
end
|
||
|
|
|
||
|
|
if @metadata.key?(:streams)
|
||
|
|
video_streams = @metadata[:streams].select { |stream| stream[:codec_type] == 'video' }
|
||
|
|
audio_streams = @metadata[:streams].select { |stream| stream[:codec_type] == 'audio' }
|
||
|
|
|
||
|
|
if (video_stream = video_streams.first)
|
||
|
|
@video_codec = video_stream[:codec_name]
|
||
|
|
@colorspace = video_stream[:pix_fmt]
|
||
|
|
@width = video_stream[:width]
|
||
|
|
@height = video_stream[:height]
|
||
|
|
@frame_rate = video_stream[:avg_frame_rate] == '0/0' ? nil : Rational(video_stream[:avg_frame_rate])
|
||
|
|
end
|
||
|
|
|
||
|
|
if (audio_stream = audio_streams.first)
|
||
|
|
@audio_codec = audio_stream[:codec_name]
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
@invalid = true if @metadata.key?(:error)
|
||
|
|
end
|
||
|
|
end
|