[Bug 784715] dashdemux: Add support webvtt subtitle stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784715

--- Comment #3 from Seungha Yang <sh.yang at lge.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> Review of attachment 355203 [details] [review]:
> 
> ::: ext/dash/gstmpdparser.c
> @@ +5750,3 @@
>      return "audio/x-m4a";
> +  } else if (strcmp (mimeType, "text/vtt") == 0) {
> +    return "application/x-subtitle-vtt";
> 
> webvttenc from gst-plugins-bad uses "text/vtt"

webvttenc seems to encoder element but we need to subparse element to parse it.

Factory Details:
  Rank                     primary (256)
  Long-name                Subtitle parser
  Klass                    Codec/Parser/Subtitle
  Description              Parses subtitle (.sub) files into text streams
....

Pad Templates:
  SINK template: 'sink'
    Availability: Always
    Capabilities:
      application/x-subtitle
      application/x-subtitle-sami
      application/x-subtitle-tmplayer
      application/x-subtitle-mpl2
      application/x-subtitle-dks
      application/x-subtitle-qttext
      application/x-subtitle-lrc
      *application/x-subtitle-vtt*

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