From e8d8603d2cd30e5c46a089d8727c7a78e7edc39a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E9=B9=8F=E6=9D=B0?= <260083304@qq.com>
Date: Tue, 13 Sep 2022 09:20:14 +0800
Subject: [PATCH] fix parse sdp  sprop-parameter-sets

when sprop-parameter-sets  value is "sprop-parameter-sets=,xxxxxx",the first param is emprty
---
 format/rtsp/sdp/parser.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/format/rtsp/sdp/parser.go b/format/rtsp/sdp/parser.go
index 529f524..ea5ef51 100644
--- a/format/rtsp/sdp/parser.go
+++ b/format/rtsp/sdp/parser.go
@@ -160,6 +160,9 @@ func Parse(content string) (sess Session, medias []Media) {
 									case "sprop-parameter-sets":
 										fields := strings.Split(val, ",")
 										for _, field := range fields {
+											if field == "" {
+												continue
+											}
 											val, _ := base64.StdEncoding.DecodeString(field)
 											media.SpropParameterSets = append(media.SpropParameterSets, val)
 										}