WebVTTV Subtitles not working on dash stream using webvtt subtitles. My app uses native HTML5 player and I can see with the help of mpeg-dash chrome plugin that subtitle do load. However, video plays without subtitles on different smart tvs I tested like Hisense, ROKU, TCL and it simply crashes LG TV .
I can see in network logs, it doesn't make request for text streams at all. There is styling and positioning information within the WebVTTV file, wondering if that is the issue. However, I don't see request for WebVTTV file also as I can see if I test same in chrome Dash plugin.
Example of video tag :
<video id="mediaPlayerVideo" preload="auto" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;"><source src="http://vod-pbsamerica.simplestreamcdn.com/pbs/encoded/394438.ism/manifest.mpd?filter=(FourCC%20!%3D%20%22JPEG%22%20%26%26%20systemBitrate%20%3C%203500000)" type="application/dash+xml"></video>
Can't figure out the issue as I don't see anything in network log of the TV browsers on debugging.
I wonder if it's because it can't parse the url of the webvttv file "textstream_eng=1000.webvtt ".
Update: I can see if its m3u8, I can see subtitles playing with webvttv file
Just using TTML format worked. Couldn't work out what was the issue with Dash+WEBVTT on those TVs even though they support HBBTV specs