diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 8037499..46fbc59 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -390,16 +390,17 @@ typedef struct AVIndexEntry {
     int min_distance;         /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
 } AVIndexEntry;
 
-#define AV_DISPOSITION_DEFAULT   0x0001
-#define AV_DISPOSITION_DUB       0x0002
-#define AV_DISPOSITION_ORIGINAL  0x0004
-#define AV_DISPOSITION_COMMENT   0x0008
-#define AV_DISPOSITION_LYRICS    0x0010
-#define AV_DISPOSITION_KARAOKE   0x0020
+#define AV_DISPOSITION_DEFAULT          0x0001
+#define AV_DISPOSITION_DUB              0x0002
+#define AV_DISPOSITION_ORIGINAL         0x0004
+#define AV_DISPOSITION_COMMENT          0x0008
+#define AV_DISPOSITION_LYRICS           0x0010
+#define AV_DISPOSITION_KARAOKE          0x0020
+#define AV_DISPOSITION_HEARING_IMPAIRED 0x0040
 /** Track should be used during playback by default.
     Useful for subtitle track that should be displayed
     even when user did not explicitly ask for subtitles. */
-#define AV_DISPOSITION_FORCED    0x0040
+#define AV_DISPOSITION_FORCED           0x0080
 
 /**
  * Stream structure.
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index bb61e03..66fef44 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -569,6 +569,7 @@ static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
     st->codec->codec_type = AVMEDIA_TYPE_DATA;
     st->codec->codec_id   = CODEC_ID_NONE;
     st->need_parsing = AVSTREAM_PARSE_FULL;
+    st->disposition = 0;
     pes->st = st;
     pes->stream_type = stream_type;
 
@@ -992,7 +993,20 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
                 language[1] = get8(&p, desc_end);
                 language[2] = get8(&p, desc_end);
                 language[3] = 0;
-                get8(&p, desc_end);
+                
+                /* hearing impaired subtitles detection */
+                switch(get8(&p, desc_end)) {
+                case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
+                case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
+                case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
+                case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
+                case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
+                    st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
+                    break;
+                default:
+                    break;
+                }
+                
                 comp_page = get16(&p, desc_end);
                 anc_page = get16(&p, desc_end);
                 st->codec->sub_id = (anc_page << 16) | comp_page;