diff --git a/cmd/v1_camera_pipeline_ifdef.c b/cmd/v1_camera_pipeline_ifdef.c
index 00b8789..0cd1ad7 100644
--- a/cmd/v1_camera_pipeline_ifdef.c
+++ b/cmd/v1_camera_pipeline_ifdef.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdint.h>
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -56,7 +57,7 @@ typedef struct
 } VideoSender;
 
 static int video_sender_init(VideoSender *sender);
-static int video_sender_send_packet(VideoSender *sender, const AVPacket *encoded_pkt);
+static int video_sender_send_packet(VideoSender *sender, const AVPacket *encoded_pkt, uint64_t timestamp);
 static void video_sender_close(VideoSender *sender);
 
 typedef struct
@@ -72,6 +73,13 @@ double get_time_ms()
     return ts.tv_sec * 1000.0 + ts.tv_nsec / 1000000.0;
 }
 
+int64_t get_realtime_ms()
+{
+    struct timespec ts;
+    clock_gettime(CLOCK_REALTIME, &ts);
+    return (int64_t)ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+}
+
 static const char *env_or_default(const char *name, const char *fallback)
 {
     const char *value = getenv(name);
@@ -127,18 +135,41 @@ static int video_sender_init(VideoSender *sender)
     return 0;
 }
 
-static int video_sender_send_packet(VideoSender *sender, const AVPacket *encoded_pkt)
+static int video_sender_send_packet(VideoSender *sender, const AVPacket *encoded_pkt, uint64_t timestamp)
 {
+    uint8_t *senddata;
+    size_t payload_len;
+    int rc;
+
     if (sender == NULL || sender->client == NULL || encoded_pkt == NULL)
     {
         errno = EINVAL;
         return -1;
     }
-    return kcp_client_send_binary(
+    if (encoded_pkt->size < 0)
+    {
+        errno = EINVAL;
+        return -1;
+    }
+
+    payload_len = (size_t)encoded_pkt->size + sizeof(timestamp);
+    senddata = (uint8_t *)malloc(payload_len);
+    if (senddata == NULL)
+    {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    memcpy(senddata, encoded_pkt->data, (size_t)encoded_pkt->size);
+    memcpy(senddata + encoded_pkt->size, &timestamp, sizeof(timestamp));
+
+    rc = kcp_client_send_binary(
         sender->client,
         sender->target_peer,
-        encoded_pkt->data,
-        (size_t)encoded_pkt->size);
+        senddata,
+        payload_len);
+    free(senddata);
+    return rc;
 }
 
 static void video_sender_close(VideoSender *sender)
@@ -478,7 +509,7 @@ int main()
     PRINT_TIME("Frame | Capture | Decode | Scale | Encode | Total | Size | Marker\n");
     PRINT_TIME("------|---------|--------|-------|--------|-------|------|--------\n");
 
-    for (int i = 0; i < 100; i++)
+    for (int i = 0; i < 10000; i++)
     {
 // 只有在开启 DEBUG_TIMING 时才声明这些时间变量
 #ifdef DEBUG_TIMING
@@ -605,8 +636,12 @@ int main()
         // 如果不开启宏，也打印一些基本信息
         printf("Frame %d processed\n", i + 1);
 #endif
-
-        if (encoded_pkt && video_sender_send_packet(&sender, encoded_pkt) != 0)
+        int64_t unixtime_ms;
+        if (encoded_pkt)
+        {
+            unixtime_ms = get_realtime_ms();
+        }
+        if (encoded_pkt && video_sender_send_packet(&sender, encoded_pkt, unixtime_ms) != 0)
         {
             perror("video_sender_send_packet");
             av_frame_free(&decoded_frame);