add high res thumbnail

backend/stream.py

@@ -381,6 +381,8 @@ class MainHandler(tornado.web.RequestHandler):
         meta = await handler.meta()
         image = meta.get("og:image")
         if isinstance(image, str):
+            if handler.provider == "youtube":
+                image = image.removesuffix("hqdefault.jpg") + "maxresdefault.jpg"
             url = await handler.proxy.proxy_url(image, None)
             if isinstance(url, str):
                 self.redirect(url, status=303)