feat: expand livestream management platform

backend/services/stream_service.py

@@ -14,6 +14,17 @@ class StreamService:
     def __init__(self, db: AsyncSession):
         self.db = db
 
+    @staticmethod
+    def effective_renditions(stream: Stream) -> list:
+        if stream.renditions_json:
+            try:
+                renditions = json.loads(stream.renditions_json)
+                if isinstance(renditions, list) and renditions:
+                    return renditions
+            except (TypeError, ValueError, json.JSONDecodeError):
+                pass
+        return settings.transcode_profiles.get(stream.transcode_profile, settings.qualities)
+
     async def create_stream(self, title: str, description: str | None = None,
                             cover_url: str | None = None,
                             scheduled_at: str | None = None,
@@ -95,7 +106,7 @@ class StreamService:
                 started_at=datetime.utcnow(),
             )
             rtmp_url = media_service.get_rtmp_url(stream_key)
-            transcode_mgr.start_transcode(stream_key, rtmp_url, stream.transcode_profile)
+            transcode_mgr.start_transcode(stream_key, rtmp_url, self.effective_renditions(stream))
 
     async def set_stream_ended(self, stream_key: str):
         stream = await self.get_stream_by_key(stream_key)
@@ -112,7 +123,7 @@ class StreamService:
         stream = await self.get_stream_by_key(stream_key)
         if not stream:
             return {"lines": [], "qualities": [], "multicast_available": False, "selected_node": None}
-        qualities = settings.transcode_profiles.get(stream.transcode_profile, settings.qualities)
+        qualities = self.effective_renditions(stream)
         best_node = lb.select_best_node(client_ip)
         if not best_node:
             best_node = lb.get_enabled_nodes()[0] if lb.get_enabled_nodes() else None