diff --git a/trunk/.gitignore b/trunk/.gitignore
index 45ec1cf0b..4e90c9b49 100644
--- a/trunk/.gitignore
+++ b/trunk/.gitignore
@@ -2,6 +2,7 @@
 /*.conf
 /*.txt
 /*.flv
+/*.mp4
 /doc/frozen*.flv
 /doc/kungfupanda*.flv
 /doc/time*.flv
diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index 59d436a2c..78eebbc3d 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -1194,6 +1194,12 @@ srs_error_t SrsHls::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* forma
     if (!enabled) {
         return err;
     }
+
+    // Ignore if no format->acodec, it means the codec is not parsed, or unknown codec.
+    // @issue https://github.com/ossrs/srs/issues/1506#issuecomment-562079474
+    if (!format->acodec) {
+        return err;
+    }
     
     // update the hls time, for hls_dispose.
     last_update_time = srs_get_system_time();
@@ -1202,7 +1208,6 @@ srs_error_t SrsHls::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* forma
     SrsAutoFree(SrsSharedPtrMessage, audio);
     
     // ts support audio codec: aac/mp3
-    srs_assert(format->acodec);
     SrsAudioCodecId acodec = format->acodec->id;
     if (acodec != SrsAudioCodecIdAAC && acodec != SrsAudioCodecIdMP3) {
         return err;
@@ -1251,7 +1256,13 @@ srs_error_t SrsHls::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* forma
     if (!enabled) {
         return err;
     }
-    
+
+    // Ignore if no format->vcodec, it means the codec is not parsed, or unknown codec.
+    // @issue https://github.com/ossrs/srs/issues/1506#issuecomment-562079474
+    if (!format->vcodec) {
+        return err;
+    }
+
     // update the hls time, for hls_dispose.
     last_update_time = srs_get_system_time();