Eğer kendi player'ınız ile çalışıyorsanız basit bir şekilde mümkün;

Çalışan örneği buradan inceleyebilirsiniz: http://www.longtailvideo.com/support...btitle-tracks/

Örnekte JW player kullanılmıştır. Birden fazla dilin altyazısı seçilebilir.

<div id="myElement"></div>

<script>
    jwplayer("myElement").setup({
      playlist: [{
        image: "/uploads/myPoster.jpg",
        file: "/uploads/myVideo.mp4",
        tracks: [
          { file: "/uploads/myCaptionsEn.vtt", label: "English", kind: "subtitles" },
          { file: "/uploads/myCaptionsFa.vtt", label: "Farsi", kind: "subtitles" },
          { file: "/uploads/myCaptionsJa.vtt", label: "Japanese", kind: "subtitles" },
          { file: "/uploads/myCaptionsRu.vtt", label: "Russian", kind: "subtitles" }
        ]
      }]
    });
</script>

Örnek vtt dosyası;

WEBVTT

00:00:12,000 --> 00:00:15,000
What brings you to the land
of the gatekeepers?

00:00:18,500 --> 00:00:20,500
I'm searching for someone.

00:00:36,500 --> 00:00:39,000
A dangerous quest for a lone hunter.

00:00:41,500 --> 00:00:44,000
I've been alone for as long
as I can remember.