diff --git a/src/rtsp_manager.cpp b/src/rtsp_manager.cpp
index 6d96486..cf17d15 100644
--- a/src/rtsp_manager.cpp
+++ b/src/rtsp_manager.cpp
@@ -36,7 +36,7 @@ GstRTSPMediaFactory *RTSPManager::create_media_factory(const Camera &cam)
         ",height=" + std::to_string(out_height) +
         ",framerate=" + std::to_string(cam.fps) + "/1"
                                                   " ! queue max-size-buffers=1 leaky=downstream" // 最小队列
-                                                  " ! mpph264enc bps=4000000 gop=" +
+                                                  " ! mpph264enc bps=2000000 gop=" +
         std::to_string(cam.fps) + "  " // 固定 4Mbps
                                   " ! h264parse"
                                   " ! rtph264pay name=pay0 pt=96 config-interval=1 )"; // 每秒发送 SPS/PPS