perf: flv设置自动清除缓存

@@ -15838,6 +15838,9 @@ class HandleDynamicEffect {
                                 isLive: true,
                                 cors: true,
                                 withCredentials: false,
+                                hasAudio: false,
+                                autoCleanupSourceBuffer: true,
+                                autoCleanupMaxBackwardDuration: 60,
                             }
                         },
                     }