rtsp: fixup sdp media type returned by TP-LINK camera

Related: https://github.com/aler9/mediamtx/issues/990

cmd/rtsp/rtsp.go

@@ -1,6 +1,10 @@
 package rtsp
 
 import (
+	"net"
+	"net/url"
+	"strings"
+
 	"github.com/AlexxIT/go2rtc/cmd/app"
 	"github.com/AlexxIT/go2rtc/cmd/streams"
 	"github.com/AlexxIT/go2rtc/pkg/core"
@@ -8,9 +12,6 @@ import (
 	"github.com/AlexxIT/go2rtc/pkg/rtsp"
 	"github.com/AlexxIT/go2rtc/pkg/tcp"
 	"github.com/rs/zerolog"
-	"net"
-	"net/url"
-	"strings"
 )
 
 func Init() {
@@ -123,6 +124,7 @@ func rtspHandler(url string) (core.Producer, error) {
 		if !backchannel {
 			return nil, err
 		}
+		log.Trace().Msgf("[rtsp] describe (backchannel=%t) err: %v", backchannel, err)
 
 		// second try without backchannel, we need to reconnect
 		conn.Backchannel = false