From a4acde6d9541de0ab2c00d941acfa0d92cb368e3 Mon Sep 17 00:00:00 2001
From: Alexey Khit <alexey.khit@gmail.com>
Date: Sun, 21 Aug 2022 17:26:27 +0300
Subject: [PATCH] Fix two connections to Dahua camera simultaniosly

---
 pkg/rtsp/conn.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/pkg/rtsp/conn.go b/pkg/rtsp/conn.go
index 574d3d09..d4d51da7 100644
--- a/pkg/rtsp/conn.go
+++ b/pkg/rtsp/conn.go
@@ -189,7 +189,7 @@ func (c *Conn) Do(req *tcp.Request) (*tcp.Response, error) {
 	}
 
 	if res.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("wrong response on %s", req.Method)
+		return res, fmt.Errorf("wrong response on %s", req.Method)
 	}
 
 	return res, nil
@@ -261,7 +261,14 @@ func (c *Conn) Describe() error {
 
 	res, err := c.Do(req)
 	if err != nil {
-		return err
+		if res != nil {
+			// if we have answer - give second chanse without onvif header
+			req.Header.Del("Require")
+			res, err = c.Do(req)
+		}
+		if err != nil {
+			return err
+		}
 	}
 
 	if val := res.Header.Get("Content-Base"); val != "" {