Much base work started

app/services/video_transcoder.rb

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+class VideoTranscoder
+  require 'streamio-ffmpeg'
+
+  def initialize
+    @ffmpeg_path = ENV['FFMPEG_PATH'] || 'ffmpeg'
+    @ffprobe_path = ENV['FFPROBE_PATH'] || 'ffprobe'
+  end
+
+  def transcode_for_web(input_path:, output_path:, on_progress: nil)
+    movie = FFMPEG::Movie.new(input_path)
+
+    # Calculate progress callback
+    progress_callback = ->(progress) {
+      on_progress&.call(progress, 100)
+    }
+
+    # Transcoding options for web compatibility
+    options = {
+      video_codec: 'libx264',
+      audio_codec: 'aac',
+      custom: [
+        '-pix_fmt yuv420p',
+        '-preset medium',
+        '-crf 23',
+        '-movflags +faststart',
+        '-tune fastdecode'
+      ]
+    }
+
+    movie.transcode(output_path, options, &progress_callback)
+
+    output_path
+  end
+
+  def extract_frame(input_path, seconds)
+    movie = FFMPEG::Movie.new(input_path)
+    output_path = "#{Rails.root}/tmp/thumbnail_#{SecureRandom.hex(8)}.jpg"
+
+    movie.screenshot(output_path, seek_time: seconds, resolution: '320x240')
+    output_path
+  end
+
+  def extract_metadata(input_path)
+    movie = FFMPEG::Movie.new(input_path)
+
+    {
+      width: movie.width,
+      height: movie.height,
+      duration: movie.duration,
+      video_codec: movie.video_codec,
+      audio_codec: movie.audio_codec,
+      bit_rate: movie.bitrate,
+      frame_rate: movie.frame_rate,
+      format: movie.container
+    }
+  end
+
+  def web_compatible?(input_path)
+    movie = FFMPEG::Movie.new(input_path)
+
+    # Check if video is already web-compatible
+    return false unless movie.valid?
+
+    # Common web-compatible formats
+    web_formats = %w[mp4 webm]
+    web_video_codecs = %w[h264 av1 vp9]
+    web_audio_codecs = %w[aac opus]
+
+    format_compatible = web_formats.include?(movie.container.downcase)
+    video_compatible = web_video_codecs.include?(movie.video_codec&.downcase)
+    audio_compatible = movie.audio_codec.blank? || web_audio_codecs.include?(movie.audio_codec&.downcase)
+
+    format_compatible && video_compatible && audio_compatible
+  end
+end