[Webkit-unassigned] [Bug 190669] New: Apply WebVTT embedded Styles using Voice Span

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190669

            Bug ID: 190669
           Summary: Apply WebVTT embedded Styles using Voice Span
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rmikhael at ellation.com

Created attachment 352581

  --> https://bugs.webkit.org/attachment.cgi?id=352581&action=review

Source SubStation Alpha subtitles

This might be a duplicate of Bug ID #190369. But could provide a good example for your testing/dev work.

At Ellation we implemented live ASS to WebVTT conversion on Kaltura's nginx-vod-module. When we open our Stream URL on the browser, and enable subtitles/captions we don't get the expected styled fonts.

We are using styles with the following tags:
color, font-family, font-size, text-shadow, text-decoration.

We are applying some of these style tags using a voice span, and one of them using class specifier.

Neither of these is getting rendered correctly. Both fallback to White on Black background with fixed font-size from a fixed font-family.

I am running on macOS Sierra.

Attaching source ASS, and target WebVTT files, along with how libASS renders the text, vs how it is rendered on the browser.

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