Remove mediainfo gem, replace with ffprobe call

Gemfile

@@ -49,7 +49,7 @@ gem 'active_annotations', '~> 0.4'
 gem 'activerecord-session_store', '>= 2.0.0'
 gem 'acts_as_list'
 gem 'api-pagination'
-gem 'avalon-about', git: 'https://github.com/avalonmediasystem/avalon-about.git', tag: 'avalon-r7.7'
+gem 'avalon-about', git: 'https://github.com/avalonmediasystem/avalon-about.git', branch: 'main'
 #gem 'bootstrap-sass', '< 3.4.1' # Pin to less than 3.4.1 due to change in behavior with popovers
 gem 'bootstrap-toggle-rails'
 gem 'bootstrap_form'
@@ -78,7 +78,6 @@ gem 'active_encode', '>= 1.2.2'
 gem 'audio_waveform-ruby', '~> 1.0.7', require: 'audio_waveform'
 gem 'browse-everything', git: "https://github.com/avalonmediasystem/browse-everything.git", branch: 'v1.2-avalon'
 gem 'fastimage'
-gem 'mediainfo', git: "https://github.com/avalonmediasystem/mediainfo.git", tag: 'v0.7.1-avalon'
 gem 'rest-client', '~> 2.0'
 gem 'roo'
 gem 'wavefile', '~> 1.0.1'

Gemfile.lock

@@ -8,12 +8,11 @@ GIT
 
 GIT
   remote: https://github.com/avalonmediasystem/avalon-about.git
-  revision: cc8d816b9751d6a04750399d9ef828a33e7ac7eb
-  tag: avalon-r7.7
+  revision: f3106d139d9092ffb0e9ca468fac9e85188ad339
+  branch: main
   specs:
     avalon-about (0.1.0)
       about_page
-      mediainfo
 
 GIT
   remote: https://github.com/avalonmediasystem/avalon-workflow.git
@@ -38,13 +37,6 @@ GIT
       signet (~> 0.8)
       typhoeus
 
-GIT
-  remote: https://github.com/avalonmediasystem/mediainfo.git
-  revision: bea9479d33328c6b483ee19c008730f939d98266
-  tag: v0.7.1-avalon
-  specs:
-    mediainfo (0.7.1)
-
 GIT
   remote: https://github.com/avalonmediasystem/om.git
   revision: ffde890b4187a7d8be41ae387264cd6eb20b6ba8
@@ -1050,7 +1042,6 @@ DEPENDENCIES
   lograge
   mail (> 2.8.0.1)
   marc
-  mediainfo!
   mysql2
   net-ldap
   net-smtp

app/helpers/application_helper.rb

@@ -139,8 +139,9 @@ def user_key
     current_user.user_key if current_user
   end
 
-  # the mediainfo gem returns duration as milliseconds
-  # see attr_reader.rb line 48 in the mediainfo source
+  # We are converting FFprobe's duration output to milliseconds for
+  # uniformity with existing metadata and consequently leaving these
+  # conversion methods in place for now.
   def milliseconds_to_formatted_time(milliseconds, include_fractions = true)
     total_seconds = milliseconds / 1000
     hours = total_seconds / (60 * 60)

app/models/master_file.rb

@@ -15,6 +15,7 @@
 require 'fileutils'
 require 'hooks'
 require 'open-uri'
+require 'avalon/ffprobe'
 require 'avalon/file_resolver'
 require 'avalon/m3u8_reader'
 
@@ -564,10 +565,6 @@ def stop_processing!
 
   protected
 
-  def mediainfo
-    Mediainfo.new(FileLocator.new(file_location).location, headers: @auth_header)
-  end
-
   def find_frame_source(options={})
     options[:offset] ||= 2000
 
@@ -722,33 +719,33 @@ def saveDerivativesHash(derivative_hash)
   end
 
   def reloadTechnicalMetadata!
-    #Reset mediainfo
-    @mediainfo = mediainfo
+    # Reset ffprobe
+    @ffprobe = Avalon::FFprobe.new(FileLocator.new(file_location).location)
 
     # Formats like MP4 can be caught as both audio and video
     # so the case statement flows in the preferred order
-    self.file_format = if @mediainfo.video?
+    self.file_format = if @ffprobe.video?
                          'Moving image'
-                       elsif @mediainfo.audio?
+                       elsif @ffprobe.audio?
                          'Sound'
                        else
                          'Unknown'
                        end
 
     self.duration = begin
-      @mediainfo.duration.to_s
+      @ffprobe.duration.to_s
     rescue
       nil
     end
 
-    unless @mediainfo.video.streams.empty?
-      display_aspect_ratio_s = @mediainfo.video.streams.first.display_aspect_ratio
+    unless !@ffprobe.video?
+      display_aspect_ratio_s = @ffprobe.display_aspect_ratio
       if ':'.in? display_aspect_ratio_s
         self.display_aspect_ratio = display_aspect_ratio_s.split(/:/).collect(&:to_f).reduce(:/).to_s
       else
         self.display_aspect_ratio = display_aspect_ratio_s
       end
-      self.original_frame_size = @mediainfo.video.streams.first.frame_size
+      self.original_frame_size = @ffprobe.original_frame_size
     end
   end
 

config/initializers/about_page.rb

@@ -9,7 +9,7 @@
   config.fedora           = AboutPage::Fedora.new(ActiveFedora.fedora.connection)
   config.solr             = AboutPage::Solr.new(ActiveFedora.solr.conn, :numDocs => 1)
   config.database         = Avalon::About::Database.new(User)
-  config.mediainfo        = Avalon::About::MediaInfo.new(:version => '>=0.7.59')
+  config.mediainfo        = Settings&.mediainfo&.path ? Avalon::About::MediaInfo.new(path: Settings.mediainfo.path) : Avalon::About::MediaInfo.new()
   config.streaming_server = Avalon::About::HLSServer.new(Settings.streaming.http_base)
   config.sidekiq          = Avalon::About::Sidekiq.new(numProcesses: 1)
   config.redis            = Avalon::About::Redis.new(Redis.new(Rails.application.config.cache_store[1]))

config/initializers/ac_mediainfo.rb

@@ -1,6 +1,2 @@
-require 'mediainfo'
-
-Mediainfo.path = Settings.mediainfo.path if Settings&.mediainfo&.path
-
 # Set up for active_encode, need to happen before active_encode initializer
-ENV["MEDIAINFO_PATH"] ||= Mediainfo.path 
+ENV["MEDIAINFO_PATH"] ||= Settings.mediainfo.path if Settings&.mediainfo&.path

lib/avalon/ffprobe.rb

@@ -0,0 +1,50 @@
+# Copyright 2011-2024, The Trustees of Indiana University and Northwestern
+#   University.  Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+# 
+# You may obtain a copy of the License at
+# 
+# http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software distributed
+#   under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+#   CONDITIONS OF ANY KIND, either express or implied. See the License for the
+#   specific language governing permissions and limitations under the License.
+# ---  END LICENSE_HEADER BLOCK  ---
+
+module Avalon
+  class FFprobe
+    # media_path should be the output of `FileLocator.new(file_location).location`
+    def initialize(media_path)
+      @json_output = JSON.parse(`ffprobe -i "#{media_path}" -v quiet -show_format -show_streams -count_packets -of json`).deep_symbolize_keys
+      @video_stream = @json_output[:streams].select { |stream| stream[:codec_type] == 'video' }.first
+    end
+
+    def video?
+      # ffprobe treats plain text files as ANSI or ASCII art. This sets the codec type to video
+      # but leaves display aspect ratio `nil`. If display_aspect_ratio is nil, return false.
+      # ffprobe treats image files as a single frame video. This sets the codec type to video
+      # but the packet/frame count will equal 1. If packet count equals 1, return false.
+      return true if @video_stream && @video_stream[:display_aspect_ratio] && @video_stream[:nb_read_packets].to_i > 1
+
+      false
+    end
+
+    def audio?
+      @json_output[:streams].any? { |stream| stream[:codec_type] == 'audio' }
+    end
+
+    def duration
+      # ffprobe return duration as seconds. Existing Avalon logic expects milliseconds.
+      (@json_output[:format][:duration].to_f * 1000).to_i
+    end
+
+    def display_aspect_ratio
+      @video_stream[:display_aspect_ratio] if video?
+    end
+
+    def original_frame_size
+      "#{@video_stream[:width]}x#{@video_stream[:height]}" if video?
+    end
+  end
+end

lib/tasks/avalon_tools.rake

@@ -14,8 +14,8 @@
 
 namespace :avalon do
   namespace :tools do
-    ffmpeg_path    = Settings.ffmpeg.path || "/usr/bin/ffmpeg"
-    mediainfo_path = Settings.mediainfo.path || "/usr/bin/mediainfo"
+    ffmpeg_path    = Settings&.ffmpeg&.path || "/usr/bin/ffmpeg"
+    mediainfo_path = Settings&.mediainfo&.path || "/usr/bin/mediainfo"
     DEFAULT_TOOLS = [
       { name: "ffmpeg", path: ffmpeg_path, version_params: "-version", version_string: ">= 4", version_trim_pre: "ffmpeg version ", version_trim_last_char: "-" },
       { name: "mediainfo", path: mediainfo_path, version_string: "> 18", version_line: 1, version_trim_pre: "MediaInfoLib - v" },

spec/controllers/master_files_controller_spec.rb

@@ -20,15 +20,11 @@
 
   describe "#create" do
     let(:media_object) { FactoryBot.create(:media_object) }
-    # TODO: fill in the lets below with a legitimate values from mediainfo
-    # let(:mediainfo_video) {  }
-    # let(:mediainfo_audio) {  }
 
     before do
       # login_user media_object.collection.managers.first
       login_as :administrator
       disableCanCan!
-      # allow_any_instance_of(MasterFile).to receive(:mediainfo).and_return(mediainfo_output)
     end
 
     context "must provide a container id" do
@@ -125,9 +121,12 @@
         request.env["HTTP_REFERER"] = "/"
 
         file = fixture_file_upload('/public-domain-book.txt', 'application/json')
+        image = fixture_file_upload('/collection_poster.jpg', 'image/jpeg')
 
         expect { post :create, params: { Filedata: [file], original: 'any', container_id: media_object.id } }.not_to change { MasterFile.count }
+        expect(flash[:error]).not_to be_nil
 
+        expect { post :create, params: { Filedata: [image], original: 'any', container_id: media_object.id } }.not_to change { MasterFile.count }
         expect(flash[:error]).not_to be_nil
       end