diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 385d78b98b..fb8b0bf8fd 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -859,6 +859,7 @@ static const StreamType HLS_SAMPLE_ENC_types[] = {
 static const StreamType REGD_types[] = {
     { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
     { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3   },
+    { MKTAG('A', 'C', '-', '4'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC4   },
     { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
     { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },
     { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },