javascript - showTextTrack in Video.js 5 -

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i trying change active caption track javascript in video.js v5.10.4. saw few posts , suggested use showtexttrack, when execute command says showtexttrack not function. have following code

var video = videojs('video'); var first_track_id = video.texttracks().tracks_[0].id; // returns vjs_track_399 video.showtexttrack(first_track_id, "captions"); // returns error above

is there other way accomplish trying do, or doing wrong?

showtexttracks() video.js 4. set mode of track showing:

video.texttracks()[0].mode = 'showing';

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