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Update not fragmented subtitles management

Vinay Rosenberg requested to merge github/fork/Orange-OpenSource/fix-NotFragmented-subtitles into development

Created by: nicosang

Hi,

this PR has to optimize not fragmented subtitles management.

Indeed, when a stream is selected with not fragmented subtitle, like for instance https://vm2.dashif.org/dash/vod/testpic_2s/xml_subs.mpd, by default all the subtitles files are downloaded and parsed at the beginning. Then, if the user decides to seek somewhere in this content, the selected subtitle file is parsed a second time when this first seek command occurs.

So, these modifications allow to download only the selected subtitles file. Then, if the user wants to change subtitles track, the new file will be downloaded. Finally, if a seek command occurs, the useless parsing is not done.

Nico

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