Alleggerisce il relay YouTube e rilascia Android 2.0.8.

ffmpeg fa solo remux copy A/V; le app fissano AAC 48 kHz mono; sync deploy non cancella più garage.prod.toml.

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

backend/app/services/streams/youtube_relay.rb

@@ -116,31 +116,30 @@ module Streams
         raise Error, "ffmpeg non disponibile: #{e.message}"
       end
 
-      # RTMP grezzo da telefono (overlay bruciato lato app); fallback HLS via proxy Rails.
+      # Remux verso YouTube: video+audio copy (AAC già da app/slate a 48k mono).
+      # HLS (ADTS) → FLV richiede -bsf:a aac_adtstoasc; RTMP ha già ASC in FLV tags.
       def youtube_ffmpeg_args(intake_source, output)
         mode, url = intake_source
+        common_head = [
+          "ffmpeg", "-nostdin", "-hide_banner", "-loglevel", "warning",
+          "-fflags", "+genpts+discardcorrupt"
+        ]
+        copy_tail = ["-c:v", "copy", "-c:a", "copy", "-f", "flv", output]
+
         if mode == :rtmp
-          return [
-            "ffmpeg", "-nostdin", "-hide_banner", "-loglevel", "warning",
-            "-fflags", "+genpts+discardcorrupt",
+          return common_head + [
             "-analyzeduration", "10000000", "-probesize", "10000000",
             "-rw_timeout", "15000000",
-            "-i", url,
-            "-c:v", "copy",
-            "-c:a", "aac", "-b:a", "128k", "-ar", "48000", "-ac", "1",
-            "-bsf:a", "aac_adtstoasc",
-            "-f", "flv", output
-          ]
+            "-i", url
+          ] + copy_tail
         end
 
-        [
-          "ffmpeg", "-nostdin", "-hide_banner", "-loglevel", "warning",
-          "-fflags", "+genpts+discardcorrupt",
+        common_head + [
           "-rw_timeout", "15000000",
           "-live_start_index", "-1",
           "-i", url,
           "-c:v", "copy",
-          "-c:a", "aac", "-b:a", "128k", "-ar", "48000", "-ac", "1",
+          "-c:a", "copy",
           "-bsf:a", "aac_adtstoasc",
           "-f", "flv", output
         ]

backend/spec/services/streams/youtube_relay_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe Streams::YoutubeRelay do
+  describe ".youtube_ffmpeg_args (private)" do
+    def args(mode, url)
+      described_class.send(:youtube_ffmpeg_args, [mode, url], "rtmps://a.rtmps.youtube.com/live2/key")
+    end
+
+    it "remuxes RTMP with video and audio copy (no AAC re-encode)" do
+      cmd = args(:rtmp, "rtmp://mediamtx:1935/live/match_x")
+      expect(cmd).to include("-c:v", "copy", "-c:a", "copy", "-f", "flv")
+      expect(cmd).not_to include("aac")
+      expect(cmd.join(" ")).not_to include("-b:a")
+    end
+
+    it "remuxes HLS with AAC bitstream filter for FLV" do
+      cmd = args(:hls, "http://mediamtx:8888/live/match_x/index.m3u8")
+      expect(cmd).to include("-c:v", "copy", "-c:a", "copy", "-bsf:a", "aac_adtstoasc", "-f", "flv")
+      expect(cmd).not_to include("-b:a")
+    end
+  end
+end