diff --git a/main.py b/main.py
index 530b0be..a822e3b 100644
--- a/main.py
+++ b/main.py
@@ -258,17 +258,17 @@ def launch_ffmpeg(input_url: str, out_url: str, extra_headers: Optional[str] = N
     """
     启动一个 ffmpeg 进程：输入 input_url，输出 RTMP 到 out_url。
     """
-    user_agent = ("Mozilla/5.0 (Linux; Android 11; SAMSUNG SM-G973U) AppleWebKit/537.36 "
-                  "(KHTML, like Gecko) SamsungBrowser/14.2 Chrome/87.0.4280.141 Mobile Safari/537.36")
+    user_agent = ("Mozilla/5.0 (Linux; Android 11; SM-G973U) "
+                  "AppleWebKit/537.36 (KHTML, like Gecko) "
+                  "Chrome/87.0.4280.141 Mobile Safari/537.36")
 
     rw_timeout = "15000000"
     analyzeduration = "20000000"
     probesize = "10000000"
-    bufsize = "8000k"
 
     base = [
         "ffmpeg", "-nostdin", "-hide_banner",
-        # 超时 & 重连（必须在 -i 前面）
+        # 超时和重连
         "-rw_timeout", rw_timeout,
         "-timeout", "10000000",
         "-reconnect", "1",
@@ -280,33 +280,40 @@ def launch_ffmpeg(input_url: str, out_url: str, extra_headers: Optional[str] = N
         "-user_agent", user_agent,
         "-protocol_whitelist", "rtmp,crypto,file,http,https,tcp,tls,udp,rtp,httpproxy",
 
-        # 缓冲 & 分析
+        # 缓冲和分析
         "-thread_queue_size", "1024",
         "-analyzeduration", analyzeduration,
         "-probesize", probesize,
         "-fflags", "+discardcorrupt",
 
-        # 输入流（放在重连参数之后）
-        "-re", "-i", input_url,
+        # 输入
+        "-i", input_url,
 
-        # 视频/音频编解码
-        "-c:v", "copy",          # 直接拷贝视频，省 CPU，低延迟
-        "-c:a", "aac",           # 音频转码成 AAC（保证 YouTube 兼容）
-        "-ar", "44100",          # 音频采样率
-        "-b:a", "128k",          # 音频码率
-        "-ac", "2",              # 双声道
-        "-bufsize", bufsize,
-        "-max_muxing_queue_size", "2048",
-        "-avoid_negative_ts", "1",
-        "-fflags", "+genpts",    # 确保时间戳连续，防止花屏
+        # 强制视频转码成 YouTube 最兼容的格式
+        "-c:v", "libx264",
+        "-preset", "veryfast",
+        "-pix_fmt", "yuv420p",
+        "-profile:v", "high",
+        "-level", "4.1",
+        "-r", "30",          # 固定帧率
+        "-g", "60",          # GOP=2s
+        "-b:v", "5000k",
+        "-maxrate", "5000k",
+        "-bufsize", "10000k",
+
+        # 音频转码成 AAC
+        "-c:a", "aac",
+        "-b:a", "128k",
+        "-ar", "44100",
+        "-ac", "2",
+
+        # 避免缓冲过长导致 "no data"
+        "-muxdelay", "0",
+        "-shortest",
 
-        # 输出容器
         "-f", "flv", out_url
     ]
 
-    if extra_headers:
-        base[ base.index("-user_agent") : base.index("-protocol_whitelist") ] += ["-headers", extra_headers]
-
     if proxy_addr:
         base = ["ffmpeg", "-http_proxy", proxy_addr] + base[1:]