diff --git a/src/Extension/AAC.h b/src/Extension/AAC.h
index feb65bd7..d53b7f49 100644
--- a/src/Extension/AAC.h
+++ b/src/Extension/AAC.h
@@ -77,7 +77,7 @@ public:
         if(aac_cfg.size() < 2){
             throw std::invalid_argument("adts配置必须最少2个字节");
         }
-        _cfg = aac_cfg.substr(0,2);
+        _cfg = aac_cfg;
         onReady();
     }
 
@@ -185,8 +185,12 @@ public:
         _printer << "b=AS:" << bitrate << "\r\n";
         _printer << "a=rtpmap:" << payload_type << " MPEG4-GENERIC/" << sample_rate << "/" << channels << "\r\n";
 
-        char configStr[32] = {0};
-        snprintf(configStr, sizeof(configStr), "%02X%02X", (uint8_t)aac_cfg[0], (uint8_t)aac_cfg[1]);
+        string configStr;
+        char buf[4] = {0};
+        for(auto &ch : aac_cfg){
+            snprintf(buf, sizeof(buf), "%02X", (uint8_t)ch);
+            configStr.append(buf);
+        }
         _printer << "a=fmtp:" << payload_type << " streamtype=5;profile-level-id=1;mode=AAC-hbr;"
                  << "sizelength=13;indexlength=3;indexdeltalength=3;config=" << configStr << "\r\n";
         _printer << "a=control:trackID=" << (int)TrackAudio << "\r\n";
diff --git a/src/Extension/Factory.cpp b/src/Extension/Factory.cpp
index 276ce140..3a8fce31 100644
--- a/src/Extension/Factory.cpp
+++ b/src/Extension/Factory.cpp
@@ -33,17 +33,12 @@ Track::Ptr Factory::getTrackBySdp(const SdpTrack::Ptr &track) {
             return nullptr;
         }
         string aac_cfg;
-
-        unsigned int cfg1;
-        sscanf(aac_cfg_str.substr(0, 2).data(), "%02X", &cfg1);
-        cfg1 &= 0x00FF;
-        aac_cfg.push_back(cfg1);
-
-        unsigned int cfg2;
-        sscanf(aac_cfg_str.substr(2, 2).data(), "%02X", &cfg2);
-        cfg2 &= 0x00FF;
-        aac_cfg.push_back(cfg2);
-
+        for(int i = 0 ; i < aac_cfg_str.size() / 2 ; ++i ){
+            unsigned int cfg;
+            sscanf(aac_cfg_str.substr(i * 2, 2).data(), "%02X", &cfg);
+            cfg &= 0x00FF;
+            aac_cfg.push_back((char)cfg);
+        }
         return std::make_shared<AACTrack>(aac_cfg);
     }
 
diff --git a/src/Record/MP4Muxer.cpp b/src/Record/MP4Muxer.cpp
index a543126a..c62c3dbb 100644
--- a/src/Record/MP4Muxer.cpp
+++ b/src/Record/MP4Muxer.cpp
@@ -202,7 +202,8 @@ void MP4Muxer::addTrack(const Track::Ptr &track) {
                                                  audio_track->getAudioChannel(),
                                                  audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
                                                  audio_track->getAudioSampleRate(),
-                                                 audio_track->getAacCfg().data(), 2);
+                                                 audio_track->getAacCfg().data(),
+                                                 audio_track->getAacCfg().size());
             if(track_id < 0){
                 WarnL << "添加AAC Track失败:" << track_id;
                 return;