html5 MKV playback with subtitles

Question

I am attempting to play an MKV file in my chrome browser with subtitles so I can view local video files. This has been successful, using the above method/code in Microsoft Edge, however, when I use chrome I am unable to see the subtitles (cannot use Firefox as MKV was unsupported)

<video id="video" controls preload="metadata" style="width:80%;height:80%">
   <source src="file.mkv" type="video/mp4">
   <source src="file.mkv" type="video/webm">
   <track label="language one" kind="subtitles" srclang="en" src="sub.vtt">
   <track label="language two" kind="subtitles" srclang="en" src="sub.vtt">
</video>

File structure

• chrome MKV player //(root directory)
• file.mkv //(The video file)
• file.vtt //(The subtitle file)
• RUN.html //(The html file that displays the video)

This method was based off of this github repository "https://github.com/iandevlin/iandevlin.github.io/tree/master/mdn/video-player-with-captions"

I have:

• tried using different subtitle formats (vtt, stl, ass, srt)

Answer 1

Perhaps the primary language must be tagged with default?

<track label="language one" kind="subtitles" srclang="en" src="sub.vtt" default>

Works for me, haven't tried without. Otherwise I'd guess there's something wrong with the .vtt file.