diff --git a/src/rtmp_manager.cpp b/src/rtmp_manager.cpp
index b03c4c4..c060c5f 100644
--- a/src/rtmp_manager.cpp
+++ b/src/rtmp_manager.cpp
@@ -56,26 +56,19 @@ GstElement* RTMPManager::create_pipeline(const Camera& cam)
 
     std::string pipeline_str = "v4l2src device=" + cam.device +
                                " io-mode=dmabuf "
+                               "do-timestamp=true "  // ⭐⭐ 正确位置：就在 v4l2src 上
 
-                               // ⭐ 强制打时间戳（关键）
-                               "! identity do-timestamp=true "
-
-                               // 原始 4:3 输入
                                "! video/x-raw,format=NV12,width=1280,height=960,framerate=30/1 "
 
-                               // 裁成 16:9
                                "! videocrop top=120 bottom=120 "
 
-                               // 缩放到目标分辨率
                                "! videoscale "
                                "! video/x-raw,width=" +
                                std::to_string(cam.width) + ",height=" + std::to_string(cam.height) +
                                " "
 
-                               // 缓冲（只在这里允许丢帧）
                                "! queue max-size-buffers=12 max-size-time=0 leaky=downstream "
 
-                               // 编码
                                "! mpph264enc rc-mode=cbr "
                                "bps=" +
                                std::to_string(cam.bitrate) +
@@ -84,12 +77,11 @@ GstElement* RTMPManager::create_pipeline(const Camera& cam)
                                "header-mode=each-idr "
                                "profile=main "
 
-                               // 解析 + 帧探针位置
                                "! h264parse name=parse config-interval=1 "
                                "! video/x-h264,stream-format=avc,alignment=au "
 
-                               // RTMP
                                "! flvmux streamable=true "
+
                                "! rtmpsink location=\"" +
                                rtmp_url +
                                "\" "