Add VTT subtitles support

[ancho85]

Been using this amazing app for a couple of years now. But I've never figure it out why some channels offer the subtitles option, yet when selected nothing appears.
This is an example of a channel replying with subtitles available in English.

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#EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS

#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="CC",LANGUAGE="eng",NAME="English",INSTREAM-ID="CC1"
#EXT-X-STREAM-INF:BANDWIDTH=3193687,AVERAGE-BANDWIDTH=3075600,CODECS="avc1.64001f,mp4a.40.2",RESOLUTION=1280x720,FRAME-RATE=29.970,CLOSED-CAPTIONS="CC",SUBTITLES="subs"
https://dai.google.com/linear/hls/pa/event/b102wvjXSLGQWwRTT-QaaA/stream/fb3c5463-aaf2-4a99-a680-bf7b6c264f31:SCL/variant/c9d39d1cc8be4caf1eb6558e293656d3/bandwidth/3193687.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=1363709,AVERAGE-BANDWIDTH=1315600,CODECS="avc1.64001f,mp4a.40.2",RESOLUTION=1024x576,FRAME-RATE=29.970,CLOSED-CAPTIONS="CC",SUBTITLES="subs"
https://dai.google.com/linear/hls/pa/event/b102wvjXSLGQWwRTT-QaaA/stream/fb3c5463-aaf2-4a99-a680-bf7b6c264f31:SCL/variant/6242671c13b557005a08247703f0ff6f/bandwidth/1363709.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=791841,AVERAGE-BANDWIDTH=765600,CODECS="avc1.64001e,mp4a.40.2",RESOLUTION=640x360,FRAME-RATE=29.970,CLOSED-CAPTIONS="CC",SUBTITLES="subs"
https://dai.google.com/linear/hls/pa/event/b102wvjXSLGQWwRTT-QaaA/stream/fb3c5463-aaf2-4a99-a680-bf7b6c264f31:SCL/variant/a15f39bd87f5e57b6089b3cc00116fae/bandwidth/791841.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=448720,AVERAGE-BANDWIDTH=435600,CODECS="avc1.4d400d,mp4a.40.2",RESOLUTION=384x216,FRAME-RATE=29.970,CLOSED-CAPTIONS="CC",SUBTITLES="subs"
https://dai.google.com/linear/hls/pa/event/b102wvjXSLGQWwRTT-QaaA/stream/fb3c5463-aaf2-4a99-a680-bf7b6c264f31:SCL/variant/0c0ec38edff848ba015d7d3023bf7e61/bandwidth/448720.m3u8
#EXT-X-MEDIA:TYPE=SUBTITLES,NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="eng",GROUP-ID="subs",URI="https://dai.google.com/linear/hls/pa/event/b102wvjXSLGQWwRTT-QaaA/stream/fb3c5463-aaf2-4a99-a680-bf7b6c264f31:SCL/variant/49fef81a9108b2d9f5bbe0ae475ba31d/bandwidth/000.m3u8"

Following that link in the URI tag at the bottom I get a new m3u8 file with these contents:

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#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:7
#EXT-X-MEDIA-SEQUENCE:2237430
#EXT-X-DISCONTINUITY-SEQUENCE:29

#EXTINF:6.00600,
#EXT-X-PROGRAM-DATE-TIME:2022-02-15T21:58:45.101Z
https://linear-82.frequency.stream/dist/distrotv/82/hls/master/playlist_webvtt_215846__2237430.vtt
#EXTINF:6.00600,
https://linear-82.frequency.stream/dist/distrotv/82/hls/master/playlist_webvtt_215852__2237431.vtt
#EXTINF:6.00600,
https://linear-82.frequency.stream/dist/distrotv/82/hls/master/playlist_webvtt_215858__2237432.vtt
#EXTINF:6.00600,

and following any of those links I get the actual text for the subtitle that is suppose to be seen:

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WEBVTT
X-TIMESTAMP-MAP=LOCAL:3658:40:33.039,MPEGTS:207000

3664:24:30.055 --> 3664:24:32.694
â– â– (heavy breathing)

Can these several jumps to the final subtitle be supported?

[ancho85]

Just realized that using the options button (yellow) to change audio track won't do anything on TV. Tested with VLC and the audio track is changed successfully. So, maybe is the subtitles option also having this same problem? Changing audio/subtitle doesn't do anything.