# Ingest DVB subtitles on live stream and display with HLS and DASH

**URL:** <https://community.wowza.com/t/ingest-dvb-subtitles-on-live-stream-and-display-with-hls-and-dash/52088>\
**Category:** Wowza Streaming Engine\
**Created:** [October 8, 2018, 4:53pm UTC](https://community.wowza.com/t/ingest-dvb-subtitles-on-live-stream-and-display-with-hls-and-dash/52088 "2018-10-08T16:53:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Seb\_Seb](https://avatars.discourse-cdn.com/v4/letter/s/65b543/32.png) [@Seb\_Seb](https://community.wowza.com/u/Seb_Seb)\
**Post date:** [October 8, 2018, 4:53pm UTC](https://community.wowza.com/t/ingest-dvb-subtitles-on-live-stream-and-display-with-hls-and-dash/52088/1 "2018-10-08T16:53:09Z")

</div>

Hi,

We receive several live streams each containing subtitles tracks and we can’t display this subtitles with HLS or DASH players client side.

ffprobe commands on input source streams shows that this subtitles tracks can be encoded using either **dvb\_teletext** or **dvb\_subtitle**.

Example 1 :

```auto
Stream #0:0[0x1e1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), 
yuv420p(tv, top first), 720x576 [SAR 16:11 DAR 20:11], 25 fps, 25 tbr, 
90k tbn, 50 tbc
Stream #0:1[0x1e2](fra): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 64 kb/s
Stream #0:1[0x1e2](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 64 kb/s
Stream #0:4[0x20f](fra): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)

```

Example 2 :

```auto
Stream #0:0[0x1fe]: Video: h264 (High) ([27][0][0][0] / 0x001B), 
yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 24.75 fps, 
25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x209](fra): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:2[0x20a](eng): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:3[0x21e](fra): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)

```

This streams are transcoded using ffmpeg command line, keeping the subtitle track unchanged :

```auto
ffmpeg -i udp://<InputIP:Port>?fifo_size=5000000&overrun_nonfatal=1 \ 
  -scodec copy
  -vcodec <video options> \
  -acodec <audio options> \
  -f mpegts udp://<WowzaIP:Port>?pkt_size=1316

```

The output stream plays well for Audio and Video with HLS, DASH and RTMP on our Wowza server.

Following this tutorial :

[https://www.wowza.com/docs/how-to-ingest-mpeg-ts-dvb-teletext-subtitle-data-for-closed-captioning-in-live-streams](https://www.wowza.com/docs/how-to-ingest-mpeg-ts-dvb-teletext-subtitle-data-for-closed-captioning-in-live-streams)

Our server is well set up to injest DVB Teletext subtitle data for closed captionning as we can see in the log files on one sample channel :

```auto
241676 2018-10-08 15:06:15 CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 programID:1 - - - 1468438.722 - - - - - - - - - - - - -
  - - - - - - - - - - - -
241677 2018-10-08 15:06:15  
CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Hit teletext PID: 0x102 - - - 1468438.722 - - - - - - - - -
  - - - - - - - - - - - - - - - -
241678 2018-10-08 
 15:06:15 CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Subtitle page: lang:fra type:5 magazine:8 page_number:88 - - -  
1468438.722 - - - - - - - - - - - - - - - - - - - - 
 - - - - -
241679 2018-10-08 15:06:15 CEST comment server  
INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Add teletext PID: 0x102 - - - 1468438.722 - - - - - - - - -
  - - - - - - - - - - - - - - - -

241777 2018-10-08 15:06:20 CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 programID:1 - - - 1468443.009 - - - - - - - - - - - - -
  - - - - - - - - - - - -
241778 2018-10-08 15:06:20  
CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Hit teletext PID: 0x102 - - - 1468443.009 - - - - - - - - -
  - - - - - - - - - - - - - - - -
241779 2018-10-08 
 15:06:20 CEST comment server INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Subtitle page: lang:fra type:5 magazine:8 page_number:88 - - -  
1468443.009 - - - - - - - - - - - - - - - - - - - - 
 - - - - -
241780 2018-10-08 15:06:20 CEST comment server  
INFO 200 -  
RTPDePacketizerMPEGTSMonitorDVBTeletext.onPMT[/path/to/file.stream.stream]:
 Add teletext PID: 0x102 - - - 1468443.01 - - - - - - - - -
  - - - - - - - - - - - - - - - -

```

We also enabled Closed Captions and especially AMF onTextData on our live application following this tutorial :

[https://www.wowza.com/docs/How-to-configure-closed-captioning-for-live-streaming#ontextdata](https://www.wowza.com/docs/How-to-configure-closed-captioning-for-live-streaming#ontextdata)

After restarting the server, no substitles seem to be enabled for HLS Streams :

playlist.m3u8 :

```auto
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=15609181,CODECS="avc1.100.40,mp4a.40.2",RESOLUTION=1920x1080
chunklist_w1063099262.m3u8?ticket=chuck

```

chunklist\_w1063099262.m3u8 :

```auto
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:11
#EXT-X-MEDIA-SEQUENCE:36
#EXTINF:10.2,
media_w1063099262_36.ts?ticket=chuck
#EXTINF:10.48,
media_w1063099262_37.ts?ticket=chuck
#EXTINF:9.4,
media_w1063099262_38.ts?ticket=chuck

```

ffprobe -i media\_w1063099262\_36.ts :

```auto
Stream #0:0[0x102]: Data: timed_id3 (ID3 / 0x20334449)
Stream 
#0:1[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, 
bt709), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:2[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 135 kb/s

```

Same for DASH Streams, only video and audio tracks are listed :

```auto
<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="urn:mpeg:dash:schema:mpd:2011"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 
http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd"
  profiles="urn:mpeg:dash:profile:isoff-live:2011"
  type="dynamic"
  minimumUpdatePeriod="PT10.055S" 
  publishTime="2018-10-08T14:57:08Z" 
  availabilityStartTime="2018-10-08T14:47:56Z" 
  timeShiftBufferDepth="PT49.96S"
  suggestedPresentationDelay="PT15.0S" 
  minBufferTime="PT6.0S">
<ProgramInformation>
  <Title>channel/3005/web_1080p.stream</Title>
</ProgramInformation>
<Location>http://<server>/<application>/manifest_mvtime_w1712721404_qdGlja2V0PWNodWNr.mpd</Location>
<Period id="0" start="PT0.0S">
  <AdaptationSet id="0" group="1" mimeType="video/mp4" width="1920" 
height="1080" par="16:9" frameRate="25" segmentAlignment="true" 
startWithSAP="1" subsegmentAlignment="true" 
subsegmentStartsWithSAP="1">
  <SegmentTemplate 
timescale="90000" 
media="chunk_ctvideo_cfm4s_rid$RepresentationID$_cs$Time$_w1712721404_qdGlja2V0PWNodWNr_mpd.m4s"
initialization="chunk_ctvideo_cfm4s_rid$RepresentationID$_cinit_w1712721404_qdGlja2V0PWNodWNr_mpd.m4s">
  <SegmentTimeline>
  <S t="45039600" d="950400"/>
  <S d="806400"/>
  <S d="939600"/>
  <S d="910800"/>
  <S d="889200"/>
  </SegmentTimeline>
  </SegmentTemplate>
  <Representation id="p0va0br15100423" codecs="avc1.640028" sar="1:1" bandwidth="15100423" />
  </AdaptationSet>
  <AdaptationSet id="1" group="2" mimeType="audio/mp4" lang="eng" 
segmentAlignment="true" startWithSAP="1" subsegmentAlignment="true" 
subsegmentStartsWithSAP="1">
  <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
  <SegmentTemplate timescale="44100" 
media="chunk_ctaudio_cfm4s_rid$RepresentationID$_cs$Time$_w1712721404_qdGlja2V0PWNodWNr_mpd.m4s" 
initialization="chunk_ctaudio_cfm4s_rid$RepresentationID$_cinit_w1712721404_qdGlja2V0PWNodWNr_mpd.m4s">
  <SegmentTimeline>
  <S t="22070110" d="465916"/>
  <S d="395268"/>
  <S d="459743"/>
  <S d="446468"/>
  <S d="435223"/>
  </SegmentTimeline>
  </SegmentTemplate>
  <Representation id="p0aa0br141831" codecs="mp4a.40.2" audioSamplingRate="44100" bandwidth="141831">
  </Representation>
  </AdaptationSet>
</Period>
</MPD>

```

Do we need to enable CEA-608 caption as well as AMF onTextData to have the subtitles visible on both HLS and DASH ?

Best Regards,

---

<div class="post-metadata">

**Author:** ![max\_simba](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@max\_simba](https://community.wowza.com/u/max_simba)\
**Post date:** [December 11, 2020, 1:08pm UTC](https://community.wowza.com/t/ingest-dvb-subtitles-on-live-stream-and-display-with-hls-and-dash/52088/2 "2020-12-11T13:08:15Z")

</div>

Hello, friend!

A typical problem, you need to retransmit DVB Teletext,  
did you manage to solve your own, if so, share your experience as you did it!?

> [@Retransmitted DVB Teletext page 888 subtitles](http://community.wowza.com/t/retransmitted-dvb-teletext-page-888-subtitles/92497):
>
> Hello there! I’m having trouble relaying a stream with subtitles. I send an mpegts stream to Wowza with the following content: Stream #0:0[0x100]: Video: h264 (High 4:2:2) ([27][0][0][0] / 0x001B), yuv422p10le(progressive), 1024x576, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 139 kb/s Stream #0:2[0x102](und): Subtitle: dvb\_teletext ([6][0][0][0] / 0x0006), 492x250 Configured wowza to accept Embedded CEA-608 captions…