In stream subtitles DASH not working with http-streaming project

[Fruitsapje]

Description

Hi guys,

When moving over from contrib-dash to the http-streaming project I have encountered an issue where the in stream subtitles for a DASH stream are no longer working. The console is getting the following warning: VIDEOJS: WARN: Error encountered when parsing cues: Malformed WebVTT signature.

The test stream is showing this error when testing on the http-streaming test page: https://videojs.github.io/http-streaming/ But it is working correctly on the contrib-dash test page: https://videojs.github.io/videojs-contrib-dash/

Sources

Test .mpd with in stream subtitles (don't mind the language label not matching the actual language): https://s1-media.streamone.io/dash/account=MpBJPKUJ4Y6i/item=lAAspcbCJVCm/lAAspcbCJVCm.mpd

Steps to reproduce

Explain in detail the exact steps necessary to reproduce the issue.

1. Go to either the contrib-dash or http-streaming test page
2. Paste in the .mpd test URL
3. Press play and seek abit for subtitles to show

Results

Expected

Expected both test pages to display the in stream subtitles.

Error output

in the http-streaming test page: VIDEOJS: WARN: Error encountered when parsing cues: Malformed WebVTT signature.

Additional Information

Please include any additional information necessary here. Including the following:

videojs-http-streaming version

what version of videojs-http-streaming does this occur with? videojs-http-streaming 1.4.1 and latest version on test page

videojs version

what version of videojs does this occur with? video.js 7.3.0 and latest version on test page

Hope you can help.

Thanks!

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[Fruitsapje]

Hey there,

Is there any update available on this matter? Would love some feedback so I can make some decisions regarding this subject :)

Hope to hear from you!

Kind regards

[hrehman200]

I am also facing the same problem with videojs 7 with http-streaming built in. Subtitles show properly in Safari if I set nativeTextTracks: true

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[AlexGruzin]

Same problem "video.js": "7.13.1" My config:

{
        autoplay: 'any',
        responsive: true,
        controls: true,
        preload: 'auto',
        nativeAudioTracks: false,
        nativeVideoTracks: false,
        nativeTextTracks: false,
        nativeControlsForTouch: false,
        preloadTextTracks: true,
        html5: {
            nativeCaptions: false,
            vhs: {
                enableLowInitialPlaylist: true,
                handlePartialData: true,
                parse708captions: true,
                overrideNative: true,
                handleManifestRedirects: true,
            }
        }
    }

No errors I could see. Subs are shown in TextTrackList(), but enabling them makes no effect. So as I see contrib-dash making requests to download text tracks (screenshoot). Vhs do not make text tracks requests.

Here is the source to check: url: 'https://storage.googleapis.com/shaka-demo-assets/sintel-mp4-wvtt/dash.mpd' (nothing works) or url: 'https://livesim.dashif.org/livesim/testpic_2s/cea608.mpd' (sw track not working)

[gkatsev]

Unfortunately, we currently only support VTT based captions in DASH, not those embedded in mp4.

[phloxic]

@gkatsev - the first example is arguably vtt based, but embedded in mp4; do you mean a 'normal' vtt file (not in mpd), or sidecar ttml (never tried that), or?

[gkatsev]

Yup, vtt embedded in mp4 isn't supported. Direct vtt files are. TTML isn't supported either right now, unfortunately.

[phloxic]

Yup, vtt embedded in mp4 isn't supported. Direct vtt files are. TTML isn't supported either right now, unfortunately.

Thanks for clarifying.

[phloxic]

For completeness sake, what also seems to work are 'sidecar' vtt referenced in mpd, sth like:

  <AdaptationSet mimeType="text/vtt" lang="en">
    <Representation id="1" bandwidth="256">
      <BaseURL>https://mydomain.com/subtitles-en.vtt</BaseURL>
    </Representation>
  </AdaptationSet>