Fix onvif client for some cameras

pkg/onvif/helpers.go

@@ -3,6 +3,7 @@ package onvif
 import (
 	"fmt"
 	"net"
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
@@ -129,3 +130,14 @@ func GetPosixTZ(current time.Time) string {
 
 	return prefix + fmt.Sprintf("%02d:%02d", offset/60, offset%60)
 }
+
+func GetPath(urlOrPath, defPath string) string {
+	if urlOrPath == "" || urlOrPath[0] == '/' {
+		return defPath
+	}
+	u, err := url.Parse(urlOrPath)
+	if err != nil {
+		return defPath
+	}
+	return GetPath(u.Path, defPath)
+}