avoid crash in case of invalid H264 SPS (#590)

go.mod

@@ -5,7 +5,7 @@ go 1.16
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
-	github.com/aler9/gortsplib v0.0.0-20210928133338-9f4f3054daa7
+	github.com/aler9/gortsplib v0.0.0-20210928202522-1c23e1ff7e8e
 	github.com/asticode/go-astits v1.9.0
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gin-gonic/gin v1.7.2

go.sum

@@ -2,8 +2,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafo
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/aler9/gortsplib v0.0.0-20210928133338-9f4f3054daa7 h1:PGGpgZejUm7y95ai31cz3XMfwITWu/+xkQoPS4qq+io=
-github.com/aler9/gortsplib v0.0.0-20210928133338-9f4f3054daa7/go.mod h1:DKI+t4Wj5YjkpxmiQhmG3qRG5VMOprDQvto62wMO68c=
+github.com/aler9/gortsplib v0.0.0-20210928202522-1c23e1ff7e8e h1:WRcGt4GtihkuaoHRrEqqjEBzJy+s0cK4ozR5E6oLjIo=
+github.com/aler9/gortsplib v0.0.0-20210928202522-1c23e1ff7e8e/go.mod h1:DKI+t4Wj5YjkpxmiQhmG3qRG5VMOprDQvto62wMO68c=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927 h1:95mXJ5fUCYpBRdSOnLAQAdJHHKxxxJrVCiaqDi965YQ=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927/go.mod h1:vzuE21rowz+lT1NGsWbreIvYulgBpCGnQyeTyFblUHc=
 github.com/asticode/go-astikit v0.20.0 h1:+7N+J4E4lWx2QOkRdOf6DafWJMv6O4RRfgClwQokrH8=