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We don't currently have a way to preselect which, if any, text track is shown, so in the absence of that this track is shown as it is marked as default in the manifest. It's something I'd like us to add, although you can still enable / disable the tracks as desired programmatically today.

Hi there,
Correct suggestion, but will be of little use for the initiator if not telling how. That holds especially in view of the clarity of documentation around the textTrack matter. Let me share a few lines working such that an external .m3u8 containing "default" textTracks will be played without displaying these, but keeping the option to activate if desired. I assume the video.js player instance is called player. Add the following to the script section in the body, which I do so after a call of player.play(); :

//--- start of code snippet ---
//Disable all text tracks enabled by the default setting in the m3u8 master. This needs doing in "tech_" if the source
//is defined in the script. This approach allows simple activating in the textTracks selector (button) if there is use later.
//This is tricky as .textTracks. seems never altered (length always 0), but .textTracks_. does the trick
//The only problem is .textTracks_. seems populated delayed and an event has to listen when we can start to override.
player.one('loadedmetadata', function(){
for (let i = 0; i < player.tech_.textTracks_.length; i++) {
player.tech_.textTracks_[i].mode = 'disabled'; } } );
//--- end of code snippet ---

Hope this helps (especially as there is really scarce information on the net about this topic). Code is tested and found working for video-js 8.10.0 and 8.16.1 (test of select cases only).