Subtitle appearing twice

[davidmagine]

Have you read the FAQ and checked for duplicate open issues?
yes

If the problem is related to FairPlay, have you read the tutorial?

not related

What version of Shaka Player are you using?

4.7.11

Can you reproduce the issue with our latest release version?
yes

Can you reproduce the issue with the latest code from main?
not applicable

Are you using the demo app or your own custom app?
custom

If custom app, can you reproduce the issue using our demo app?
not applicable

What browser and OS are you using?
LG WebOS

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
LG model 55UK6400PLF, webOS 4.4.2-11 and a few other LG model tv and webOS versions

What are the manifest and license server URIs?

What configuration are you using? What is the output of player.getConfiguration()?

{
  "drm": {
    "retryParameters": {
      "maxAttempts": 5
    },
    "servers": {
      "com.widevine.alpha": "****"
    },
    "advanced": {
      "com.widevine.alpha": {
        "distinctiveIdentifierRequired": false,
        "persistentStateRequired": false,
        "videoRobustness": "SW_SECURE_DECODE",
        "audioRobustness": "SW_SECURE_CRYPTO",
        "sessionType": "",
        "serverCertificateUri": "",
        "individualizationServer": ""
      }
    }
  },
  "manifest": {
    "retryParameters": {
      "maxAttempts": 5
    },
    "availabilityWindowOverride": null
  },
  "streaming": {
    "retryParameters": {
      "maxAttempts": 5
    },
    "rebufferingGoal": 8,
    "bufferingGoal": 32,
    "stallThreshold": 2,
    "stallSkip": 0.05
  },
  "mediaSource": {},
  "offline": {},
  "abr": {
    "defaultBandwidthEstimate": 10000000,
    "restrictions": {
      "minWidth": 1
    }
  },
  "preferredAudioLanguage": "no"
}

What did you do?

Play a video with subtitle

What did you expect to happen?
Only one line of subtitle to appear

What actually happened?

Occasionally the subtitle will appear twice at different position
Video
https://github.com/shaka-project/shaka-player/assets/119855296/b8038fcb-dacb-45ea-a6c3-333fe59537f1
Image

VTT subtitle files (segments 37 and 38)
vtt.zip

Are you planning send a PR to fix it?

Additional notes:
There is no textDisplayFactory set in our configuration and we are using the default. We are also not calling setVideoContainer

[avelad]

Duplicate of #6773

[davidmagine]

@avelad, think you tag the wrong ticket. I was unable to reopen #6007 that's why i created a new ticket with more information

[avelad]

This is duplicate of #6773 It's a problem in the platform itself that we need to fix somehow :/