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Subtitles track with same lang bug

Vinay Rosenberg requested to merge github/fork/Orange-OpenSource/subtitlesTrackWithSameLangBug into development

Created by: nicosang

Hi,

this PR has to solve issues about subtitles.

  • A subtitle track may have same kind, label and lang but a different format (vtt, ttml, etc...). We have to be able to distinguish both tracks.

  • When text track switch occurs, all cues are deleted but executedRequests array was not cleaned. So, when the user seeked back, subtitles was not downloaded again.

Both issues can be reproduced with the stream https://media.axprod.net/TestVectors/v8-MultiContent/Clear/Manifest.mpd. The default text track didn't show due to first issue. Change text track selection and seek back in order to see second issue.

Nico

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