m3u8文件没有生成，无法播放

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注意：提问前，请先看FAQ(Please read FAQ before file an issue) ossrs/srs#2716

描述(Description)

描述你遇到了什么问题(Please description your issue here)

配置好后，运行的结果：
{
"code": 0,
"data": {
"channels": [
{
"id": "44030700991327000005@44030700991327000005",
"ip": "xx.xx.xx.xx",
"rtmp_port": 1935,
"app": "live",
"stream": "44030700991327000005@44030700991327000005",
"rtmp_url": "rtmp://xx.xx.xx.xx:1935/live/44030700991327000005@44030700991327000005",
"flv_url": "http://xx.xx.xx.xx:8080/live/[email protected]",
"hls_url": "http://xx.xx.xx.xx:8080/live/[email protected]",
"webrtc_url": "webrtc://xx.xx.xx.xx:1985/live/44030700991327000005@44030700991327000005",
"ssrc": 2752523,
"rtp_port": 9000,
"port_mode": "fixed",
"rtp_peer_port": 15060,
"rtp_peer_ip": "yy.yy.yy.yy",
"recv_time": 1658311316,
"recv_time_str": "2022-07-20T10:01:56.650"
}
]
}
}

上面的 "rtmp_url": "rtmp://xx.xx.xx.xx:1935/live/44030700991327000005@44030700991327000005", "flv_url": "http://xx.xx.xx.xx:8080/live/[email protected]",
没有问题，可以播放。 就是"hls_url": "http://xx.xx.xx.xx:8080/live/[email protected]" 不能播放，m3u8文件不存在。

1. SRS版本(Version): srs-gb28181

2. SRS的配置如下(Config):
   push.gb28181.conf 修改了host地址

重现(Replay)

重现Bug的步骤(How to replay bug?)

1. push.gb28181.conf 修改host地址为srs服务器IP，运行srs
2. 配置海康摄像机
3. 打开SRS控制台，预览视频，选择GB28181项，查询所有通道，得到结果：
   {
   "code": 0,
   "data": {
   "channels": [
   {
   "id": "44030700991327000005@44030700991327000005",
   "ip": "xx.xx.xx.xx",
   "rtmp_port": 1935,
   "app": "live",
   "stream": "44030700991327000005@44030700991327000005",
   "rtmp_url": "rtmp://xx.xx.xx.xx:1935/live/44030700991327000005@44030700991327000005",
   "flv_url": "http://xx.xx.xx.xx:8080/live/[email protected]",
   "hls_url": "http://xx.xx.xx.xx:8080/live/[email protected]",
   "webrtc_url": "webrtc://xx.xx.xx.xx:1985/live/44030700991327000005@44030700991327000005",
   "ssrc": 2752523,
   "rtp_port": 9000,
   "port_mode": "fixed",
   "rtp_peer_port": 15060,
   "rtp_peer_ip": "yy.yy.yy.yy",
   "recv_time": 1658311316,
   "recv_time_str": "2022-07-20T10:01:56.650"
   }
   ]
   }
   }

期望行为(Expect)

描述你期望发生的事情(Please describe your expectation)

m3u8文件能生成，能正常播放。