diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 9c04d953c4..d62470592c 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -2320,6 +2320,10 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
             }
             break;
         }
+        if (ext_desc_tag == AC4_DESCRIPTOR) {
+            st->codecpar->codec_id = AV_CODEC_ID_AC4;
+            st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+        }
         break;
     case AC3_DESCRIPTOR:
     case ENHANCED_AC3_DESCRIPTOR:
diff --git a/libavformat/mpegts.h b/libavformat/mpegts.h
index 18f326b8bf..13f958429b 100644
--- a/libavformat/mpegts.h
+++ b/libavformat/mpegts.h
@@ -228,6 +228,7 @@ https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/
 /* DVB descriptor_tag_extension values from
    ETSI EN 300 468 Table 109: Possible locations of extended descriptors */
 #define SUPPLEMENTARY_AUDIO_DESCRIPTOR 0x06
+#define AC4_DESCRIPTOR 0x15
 
 /** see "Dolby Vision Streams Within the MPEG-2 Transport Stream Format"
 https://professional.dolby.com/siteassets/content-creation/dolby-vision-for-content-creators/dolby-vision-bitstreams-in-mpeg-2-transport-stream-multiplex-v1.2.pdf */