vlc started from command line not showing subtitles when streaming HLS from URL

[eddsor]

I am trying to migrate from OMXplayer to vlc on a RPI3 without X.
Playing local videos from command line with subtitles is successfully done as

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cvlc video.mp4 --sub-file=subtitles.srt

Streaming a video from a HLS URL without subtitles is also possible:

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cvlc https://nrk-od-79.akamaized.net/world/1302779/0/hls/dnpr63701115/1853524312-1203177498-prog_index.m3u8

However, if I try to the stream the video with subtitles after dovnloading the subtitles file as DNPR63701115.vtt

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cvlc https://nrk-od-79.akamaized.net/world/1302779/0/hls/dnpr63701115/1853524312-1203177498-prog_index.m3u8 --sub-file=DNPR63701115.vtt

the video is displayed without subtitles, and I get the errors

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[61d964c0] main demux error: option sub-original-fps does not exist [5d702568] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 1) for PID 0 [5d702568] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 1) for PID 32

Playlist: https://nrk-od-79.akamaized.net/world/ ... ylist.m3u8
Subtitles file: https://undertekst.nrk.no/prod/DNPR63/7 ... 701115.vtt

How can I get vlc show the subtitles when streaming a video from a HLS URL?
Is this a well known issue with vlc?

[Rémi Denis-Courmont]

Subtitles need to be embedded in the HLS stream, AFAIK. Otherwise, time bases are different, so synchronisation will not work.

[eddsor]

I have now discovered that if I open the m3u8 file in hlsplayer.net, the video plays vith subtitles. I think that means that the HLS stream has embedded subtitles.
What can I do to get VLC show the embedded subtitles in the HLS stream?

[Rémi Denis-Courmont]

Select the subtitle track you want?

[eddsor]

--sub-track=0 or 1 makes no difference. There is only one sub-track (norwegian).
The m3u8 file has an item SUBTITLES="100wvtt.vtt". Does anybody know what that means?

I also have found that VLC for Windows desktop has exactly the same problem. The HLS video plays, but no subtitles.

[daniellemill]

I have a similar problem too(((( Is there only this solution to this problem? Are there any other options?

[unidan]

I don't see a SUBTITLES line in the m3u8 and I don't see any subtitle tracks in the PMT:

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[00007efe80001580] ts demux debug: PATCallBack called [00007efe80001580] ts demux debug: new PAT ts_id=1 version=1 current_next=1 [00007efe80001580] ts demux debug: * number=1 pid=32 [00007efe80001580] ts demux debug: temporary receiving program 1 [00007efe80001580] ts demux debug: PMTCallBack called for program 1 [00007efe80001580] ts demux debug: new PMT program number=1 version=1 pid_pcr=33 [00007efe80001580] ts demux debug: * pid=33 type=0x1b AVC video stream as defined in ITU-T Rec. H.264 [00007efe80001580] ts demux debug: => pid 33 has now es fcc=h264 [00007efe80001580] ts demux debug: Default program is 1 [00007efe80001580] ts demux debug: * pid=34 type=0xf ISO/IEC 13818-7 Audio with ADTS transport [00007efe80001580] ts demux debug: - SL/FMC descriptor not found/matched [00007efe80001580] ts demux debug: => pid 34 has now es fcc=mp4a [00007efe80001580] ts demux debug: * pid=17 listening for SDT [00007efe80001580] ts demux debug: enabling pid 33 from program 1 [00007efe80001580] ts demux debug: enabling pid 34 from program 1 [00007efe80001580] ts demux debug: enabling pcr pid 33 from program 1

Do you have such sample somewhere?

[eddsor]

The playlist I refered to is https://nrk-od-79.akamaized.net/world/1 ... ylist.m3u8
As I have written above, hlsplayer.net can play the wideo with subtitles in norwegian, but not vlc.

[zhshs]

Has this problem been solved?

[eddsor]

In VLC 3.0.21 this is not longer a problem.