diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 7a905a44e9bf8f660c6fa7bb79002adcc7a082a6..22874e6f834dd6fa0405176e07287bb02bcab684 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -803,6 +803,8 @@ static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
     st->codec->codec_tag = pes->stream_type;
 
     mpegts_find_stream_type(st, pes->stream_type, ISO_types);
+    if (pes->stream_type == 4)
+        st->request_probe = 50;
     if ((prog_reg_desc == AV_RL32("HDMV") ||
          prog_reg_desc == AV_RL32("HDPR")) &&
         st->codec->codec_id == AV_CODEC_ID_NONE) {