They can be demuxed by ffmpeg.
---
 libavformat/mpegtsenc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index ccb631d746..3818001976 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -381,6 +381,10 @@ static int mpegts_write_pmt(AVFormatContext *s, 
MpegTSService *service)
         case AV_CODEC_ID_TIMED_ID3:
             stream_type = STREAM_TYPE_METADATA;
             break;
+        case AV_CODEC_ID_DVB_SUBTITLE:
+        case AV_CODEC_ID_DVB_TELETEXT:
+            stream_type = STREAM_TYPE_PRIVATE_DATA;
+            break;
         default:
             av_log(s, AV_LOG_WARNING, "Stream %d, codec %s, is muxed as a 
private data stream "
                    "and may not be recognized upon reading.\n", i, 
avcodec_get_name(st->codecpar->codec_id));
-- 
2.26.0

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