diff --git a/src/rtmp_manager.cpp b/src/rtmp_manager.cpp
index c4e1da9..a75bfd5 100644
--- a/src/rtmp_manager.cpp
+++ b/src/rtmp_manager.cpp
@@ -71,16 +71,24 @@ GstElement* RTMPManager::create_pipeline(const Camera& cam)
     std::string pipeline_str = "v4l2src name=src device=" + cam.device +
                                " io-mode=dmabuf "
 
+                               // ⭐ 相机真实输出：写死 1080p
                                "! video/x-raw,format=NV12,"
-                               "width=" +
-                               std::to_string(cam.width) + ",height=" + std::to_string(cam.height) +
-                               ",framerate=" + std::to_string(cam.fps) +
+                               "width=1920,height=1080,"
+                               "framerate=" +
+                               std::to_string(cam.fps) +
                                "/1 "
 
-                               // 🔻 队列深度压到 2 帧（≈ 60ms@30fps）
+                               // ⭐ 关键：在编码前缩放到“推流分辨率”
+                               "! videoscale "
+                               "! video/x-raw,"
+                               "width=" +
+                               std::to_string(cam.width) + ",height=" + std::to_string(cam.height) +
+                               " "
+
+                               // 🔻 低延时队列
                                "! queue max-size-buffers=2 max-size-time=0 leaky=downstream "
 
-                               // 🔻 编码器：baseline + CBR + 无 B 帧
+                               // 🔻 编码器：SIM 卡友好
                                "! mpph264enc "
                                "rc-mode=cbr "
                                "bps=" +
@@ -92,16 +100,9 @@ GstElement* RTMPManager::create_pipeline(const Camera& cam)
                                "header-mode=each-idr "
                                "profile=baseline "
 
-                               // SPS/PPS 每秒刷新一次（SRS/WebRTC 友好）
                                "! h264parse config-interval=1 "
-
-                               // 🔻 时间戳整形但不强行等待
                                "! identity sync=false single-segment=true "
-
-                               // FLV 最小缓存模式
                                "! flvmux streamable=true "
-
-                               // sink 本身不参与同步
                                "! rtmpsink location=\"" +
                                live_rtmp +
                                "\" "