#23 subtitle track cannot playback by dash.js

[huo]

Hi,

i generate a mpd by mp4box, which include 1 video track, 2 audil tarcks and 3 sutitle tracks, then i play it use dash.js.

but the video and audio can play, subtitles cannot show, i dont kown why, could you help me check my file and command?

the detail message as below:

thank you!

mp4box version:

$ MP4Box -version
MP4Box - GPAC version 0.5.2-DEV-revUNKNOWN-UNKNOWN
GPAC Copyright (c) Telecom ParisTech 2000-2012
GPAC Configuration:
Features: GPAC_64_BITS GPAC_DISABLE_3D

mp4 info:

$ MP4Box -info out.mp4

• Movie Info *
  Timescale 1000 - Duration 00:06:51.950
  7 track(s)
  Fragmented File: no
  File Brand isom - version 512
  Created: UNKNOWN DATE Modified: UNKNOWN DATE
  File has no MPEG4 IOD/OD

Chapters:
Chapter #1 - 00:00:00.000 - "Chapter 1"

iTunes Info:
Encoder Software: Lavf55.48.100
2 UDTA types: meta (1) chpl (1)

Track # 1 Info - TrackID 1 - TimeScale 60000 - Media Duration 00:02:00.003
Track has 1 edit lists: track duration is 00:02:00.004
Media Info: Language "und (und)" - Type "vide:avc1" - 7193 samples
Visual Track layout: x=0 y=0 width=832 height=480
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
AVC/H264 Video - Visual Size 832 x 480
AVC Info: 1 SPS - 1 PPS - Profile High @ Level 3.1
NAL Unit length bits: 32
SPS#1 hash: 45FE9FE525CF527940238E8799F83072E8A2E596
PPS#1 hash: 6648DAA985D842149E548D6CDE2C2151B02BF03F
Self-synchronized
RFC6381 Codec Parameters: avc1.64001f
Average GOP length: 64 samples

Track # 2 Info - TrackID 2 - TimeScale 48000 - Media Duration 00:02:00.000
Track has 1 edit lists: track duration is 00:02:00.000
Media Info: Language "tha (tha)" - Type "soun:mp4a" - 5625 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 48000
Synchronized on stream 1
RFC6381 Codec Parameters: mp4a.40.2
Alternate Group ID 1
All samples are sync

Track # 3 Info - TrackID 3 - TimeScale 48000 - Media Duration 00:02:00.000
Track has 1 edit lists: track duration is 00:02:00.000
Track is disabled
Media Info: Language "eng (eng)" - Type "soun:mp4a" - 5625 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 48000
Synchronized on stream 1
RFC6381 Codec Parameters: mp4a.40.2
Alternate Group ID 1
All samples are sync

Track # 4 Info - TrackID 4 - TimeScale 1000 - Media Duration 00:01:59.651
Track has 1 edit lists: track duration is 00:01:59.651
Media Info: Language "tha (tha)" - Type "sbtl:tx3g" - 57 samples
Unknown Text Stream
Size 832 x 60 - Translation X=0 Y=0 - Layer 0
RFC6381 Codec Parameters: tx3g
Alternate Group ID 3
All samples are sync

Track # 5 Info - TrackID 5 - TimeScale 1000 - Media Duration 00:01:59.861
Track has 1 edit lists: track duration is 00:01:59.861
Track is disabled
Media Info: Language "eng (eng)" - Type "sbtl:tx3g" - 63 samples
Unknown Text Stream
Size 832 x 60 - Translation X=0 Y=0 - Layer 0
RFC6381 Codec Parameters: tx3g
Alternate Group ID 3
All samples are sync

Track # 6 Info - TrackID 6 - TimeScale 1000 - Media Duration 00:06:51.950
Track has 1 edit lists: track duration is 00:06:51.950
Track is disabled
Media Info: Language "und (und)" - Type "sbtl:tx3g" - 2 samples
Unknown Text Stream
Size 0 x 0 - Translation X=0 Y=0 - Layer 0
RFC6381 Codec Parameters: tx3g
Alternate Group ID 3
All samples are sync

Track # 7 Info - TrackID 7 - TimeScale 1000 - Media Duration 00:02:00.000
Track has 1 edit lists: track duration is 00:02:00.000
Track is disabled
Media Info: Language "und (und)" - Type "text:text" - 1 samples
Unknown Text Stream
Size 0 x 0 - Translation X=0 Y=0 - Layer 0
RFC6381 Codec Parameters: text
All samples are sync

mp4box command

$ MP4Box -dash 10000 -rap -profile dashavc264:onDemand -url-template out.mp4#trackID=1 out.mp4#trackID=2 out.mp4#trackID=3 out.mp4#trackID=4 out.mp4#trackID=5 out.mp4#trackID=6

mpd

$ vi out_dash.mpd

<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H6M51.950S" maxsegmentduration="PT0H0M10.000S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011,http://dashif.org/guidelines/dash264">
<programinformation moreinformationurl="http://gpac.sourceforge.net">
<title>out_dash.mpd generated by GPAC</title>
</programinformation></mpd>

<period duration="PT0H6M51.950S">
<adaptationset segmentalignment="true" maxwidth="832" maxheight="480" maxframerate="60000/1001" par="832:480" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-1" mimetype="video/mp4" codecs="avc1.64001f" width="832" height="480" framerate="60000/1001" sar="1:1" startwithsap="1" bandwidth="737537">
<baseurl>out_track1_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="970-1157">
<initialization range="0-969">
</initialization></segmentbase>
</representation>
</adaptationset>
<adaptationset segmentalignment="true" group="1" lang="tha" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-2" mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="48000" startwithsap="1" bandwidth="161646">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2">
<baseurl>out_track2_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="903-1090">
<initialization range="0-902">
</initialization></segmentbase>
</audiochannelconfiguration></representation>
</adaptationset>
<adaptationset segmentalignment="true" group="1" lang="eng" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-3" mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="48000" startwithsap="1" bandwidth="161677">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2">
<baseurl>out_track3_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="903-1090">
<initialization range="0-902">
</initialization></segmentbase>
</audiochannelconfiguration></representation>
</adaptationset>
<adaptationset segmentalignment="true" group="2" lang="tha" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-4" mimetype="video/mp4" codecs="tx3g" startwithsap="1" bandwidth="350">
<baseurl>out_track4_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="891-1066">
<initialization range="0-890">
</initialization></segmentbase>
</representation>
</adaptationset>
<adaptationset segmentalignment="true" group="2" lang="eng" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-5" mimetype="video/mp4" codecs="tx3g" startwithsap="1" bandwidth="311">
<baseurl>out_track5_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="891-1066">
<initialization range="0-890">
</initialization></segmentbase>
</representation>
</adaptationset>
<adaptationset segmentalignment="true" group="2" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
<representation id="user-content-6" mimetype="video/mp4" codecs="tx3g" startwithsap="1" bandwidth="121">
<baseurl>out_track6_dashinit.mp4</baseurl>
<segmentbase indexrangeexact="true" indexrange="891-1426">
<initialization range="0-890">
</initialization></segmentbase>
</representation>
</adaptationset>
</period>

[Jean Le Feuvre]

please use github for your questions.
I believe tx3g (apple & 3gpp timed text) is not supported by dash.js and/or underlying media engine in browser

[huo]

hi jeanlf,

i cannot create ticket.
would you like to tell me the reason?
thank you!

[Romain Bouqueau]

Please use github to report issues: https://github.com/gpac/gpac

Thank you!

[huo]

Thank you very much!

[huo]

thank you for your advice