diff --git a/src/rtmp_manager.cpp b/src/rtmp_manager.cpp
index 60f2126..f337e02 100644
--- a/src/rtmp_manager.cpp
+++ b/src/rtmp_manager.cpp
@@ -14,6 +14,12 @@
 
 #include "logger.hpp"
 
+static bool device_exists(const std::string &path)
+{
+    struct stat st;
+    return (stat(path.c_str(), &st) == 0);
+}
+
 static std::string get_ip_address(const std::string &ifname)
 {
     struct ifaddrs *ifaddr, *ifa;
@@ -129,6 +135,14 @@ RTMPManager::StreamResultInfo RTMPManager::start_camera(const Camera &cam, Strea
         return res;
     }
 
+    // 新增：设备节点存在性检查
+    if (!device_exists(cam.device))
+    {
+        res.result = 1;
+        res.reason = "Device not found: " + cam.device;
+        return res;
+    }
+
     const std::string key = make_stream_key(cam.name, type);
 
     std::unique_ptr<StreamContext> ctx;
@@ -139,15 +153,13 @@ RTMPManager::StreamResultInfo RTMPManager::start_camera(const Camera &cam, Strea
         auto it = streams.find(key);
         if (it != streams.end() && it->second->running.load())
         {
-            res.result = 0;
+            res.result = 1;  // 修改为 1：表示重复启动，不是真成功
             res.reason = "Already streaming";
             return res;
         }
 
         ctx = std::make_unique<StreamContext>();
         ctx->running.store(true);
-
-        // 重要：在把 ctx 放入 map 之前，先从 ctx->start_promise 拿到 future
         status_future = ctx->start_promise.get_future();
 
         StreamContext *ctx_ptr = ctx.get();
@@ -202,7 +214,7 @@ RTMPManager::StreamResultInfo RTMPManager::stop_camera(const std::string &cam_na
         streams.erase(it);
     }
 
-    bool was_running = ctx->status.running;  // ✅ 新增：判断是否真的在推流
+    bool was_running = ctx->running.load();  // ✅ 改为使用 running
     ctx->running.store(false);
 
     if (ctx->thread.joinable()) ctx->thread.join();
@@ -262,17 +274,15 @@ void RTMPManager::stream_loop(Camera cam, StreamType type, StreamContext *ctx)
 
     while (true)
     {
-        // 手动停止
         if (!ctx->running.load())
         {
             status.running = false;
             status.last_result = StreamResult::UNKNOWN;
             status.last_error = "Stream stopped manually";
-            try_set_start(status);  // 若启动阶段还没返回，这里补一次
+            try_set_start(status);
             break;
         }
 
-        // 首帧超时（5s）
         if (!first_frame &&
             std::chrono::duration_cast<std::chrono::seconds>(std::chrono::steady_clock::now() - t0).count() > 5)
         {
@@ -301,8 +311,7 @@ void RTMPManager::stream_loop(Camera cam, StreamType type, StreamContext *ctx)
                     status.running = true;
                     ctx->status.running = true;
                     status.last_result = StreamResult::OK;
-                    status.last_error.clear();
-                    try_set_start(status);  // 首帧成功：通知 start_camera
+                    try_set_start(status);
                 }
                 break;
             }
@@ -331,19 +340,21 @@ void RTMPManager::stream_loop(Camera cam, StreamType type, StreamContext *ctx)
 
         gst_message_unref(msg);
 
-        // 错误/EOS 后退出循环
         if (status.last_result == StreamResult::CONNECTION_FAIL || status.last_result == StreamResult::EOS_RECEIVED)
-        {
             break;
-        }
     }
 
-    gst_element_set_state(pipeline, GST_STATE_NULL);
-    if (bus) gst_object_unref(bus);
-    gst_object_unref(pipeline);
+    if (pipeline)
+    {
+        gst_element_set_state(pipeline, GST_STATE_NULL);
+        gst_object_unref(pipeline);
+    }
+    if (bus)
+    {
+        gst_object_unref(bus);
+    }
 
     ctx->status.running = false;
-    // 线程收尾：这里不要删 map 里的 ctx，stop_camera 已经负责转移并 join
 }
 
 void RTMPManager::stop_all()
@@ -400,21 +411,24 @@ std::vector<RTMPManager::StreamResultInfo> RTMPManager::process_push_request(con
 
         for (int ch : item.channels)
         {
-            if (ch < 0 || ch >= static_cast<int>(g_app_config.cameras.size())) continue;
+            if (ch < 0 || ch >= static_cast<int>(g_app_config.cameras.size()))
+            {
+                StreamResultInfo info;
+                info.loc = ch;
+                info.result = 1;
+                info.reason = "Invalid channel index";
+                info.url = "";
+                results.push_back(info);
+                continue;
+            }
 
             const auto &cam = g_app_config.cameras[ch];
             StreamResultInfo info;
 
             if (item.switchVal == 0)
-            {
-                // 开启推流
                 info = start_camera(cam, type);
-            }
             else
-            {
-                // 停止推流
                 info = stop_camera(cam.name, type);
-            }
 
             results.push_back(info);
         }