Aggiunge copertina sponsor custom solo Premium Full, con override in wizard e slate sui nodi di streaming.

Permette upload da portale e app con ereditarietà partita→squadra→società, generazione MP4 via ffmpeg e distribuzione su home lab e nodi CPX per pause e assenza segnale.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/streams/generate_cover_slate.rb

@@ -0,0 +1,121 @@
+require "open3"
+
+module Streams
+  # Converte cover_image in MP4 slate (H.264 720p + AAC mono), allineato a infra/scripts/generate_slate.sh.
+  class GenerateCoverSlate
+    class Error < StandardError; end
+
+    SLATE_DURATION_SECS = 30
+    VIDEO_FILTER = "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2:color=0x0a0a0e".freeze
+
+    def self.call(record)
+      new(record).call
+    end
+
+    def initialize(record)
+      @record = record
+    end
+
+    def call
+      return @record unless @record.cover_image.attached?
+
+      @image_temp = download_cover_image
+      @mp4_temp = encode_slate(@image_temp)
+      attach_slate(@mp4_temp)
+      write_to_slates_dir(@mp4_temp)
+      @record
+    rescue Error
+      raise
+    rescue StandardError => e
+      raise Error, e.message
+    ensure
+      cleanup_tempfiles
+    end
+
+    private
+
+    def download_cover_image
+      ext = extension_for(@record.cover_image.content_type)
+      path = temp_path("cover-in", ext)
+      @record.cover_image.blob.open(tmpdir: Dir.tmpdir) do |file|
+        FileUtils.cp(file.path, path)
+      end
+      path
+    end
+
+    def encode_slate(image_path)
+      out = temp_path("cover-slate", ".mp4")
+      cmd = ffmpeg_args(image_path, out)
+      stdout, stderr, status = Open3.capture3(*cmd)
+      unless status.success? && File.exist?(out) && File.size(out).positive?
+        detail = stderr.to_s.strip.presence || stdout.to_s.strip
+        raise Error, "ffmpeg slate failed: #{detail}"
+      end
+
+      out
+    end
+
+    def ffmpeg_args(input, output)
+      [
+        "ffmpeg", "-nostdin", "-hide_banner", "-loglevel", "error",
+        "-loop", "1", "-framerate", "30", "-i", input,
+        "-f", "lavfi", "-i", "anullsrc=r=48000:cl=mono",
+        "-filter:v", VIDEO_FILTER,
+        "-map", "0:v", "-map", "1:a",
+        "-t", SLATE_DURATION_SECS.to_s,
+        "-c:v", "libx264", "-pix_fmt", "yuv420p", "-profile:v", "baseline", "-level", "3.1",
+        "-x264-params", "keyint=30:min-keyint=30:scenecut=0:bframes=0",
+        "-g", "30", "-keyint_min", "30", "-force_key_frames", "expr:gte(t,n_forced*1)",
+        "-preset", "fast",
+        "-c:a", "aac", "-b:a", "128k", "-ac", "1", "-shortest", "-y", output
+      ]
+    end
+
+    def attach_slate(mp4_path)
+      @record.cover_slate.purge if @record.cover_slate.attached?
+      File.open(mp4_path, "rb") do |io|
+        @record.cover_slate.attach(
+          io: io,
+          filename: slate_filename,
+          content_type: "video/mp4"
+        )
+      end
+      @record.reload
+    end
+
+    def write_to_slates_dir(mp4_path)
+      dest = CoverSlatePaths.expected_path(@record)
+      return unless dest
+
+      FileUtils.mkdir_p(File.dirname(dest))
+      FileUtils.cp(mp4_path, dest)
+    rescue Errno::EACCES, Errno::EROFS => e
+      Rails.logger.info("[GenerateCoverSlate] skip disk copy #{dest}: #{e.class}")
+    end
+
+    def slate_filename
+      "#{@record.class.name.underscore}-#{@record.id}.mp4"
+    end
+
+    def extension_for(content_type)
+      case content_type
+      when "image/png" then ".png"
+      when "image/webp" then ".webp"
+      else ".jpg"
+      end
+    end
+
+    def temp_path(prefix, ext)
+      path = File.join(Dir.tmpdir, "#{prefix}-#{@record.class.name}-#{@record.id}-#{SecureRandom.hex(4)}#{ext}")
+      @tempfiles ||= []
+      @tempfiles << path
+      path
+    end
+
+    def cleanup_tempfiles
+      Array(@tempfiles).each do |path|
+        FileUtils.rm_f(path)
+      end
+    end
+  end
+end