Bug 190669

Summary: Apply WebVTT embedded Styles using Voice Span
Product: WebKit Reporter: Rafik Mikhael <rmikhael>
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ahmad.saleem792, eric.carlson, jer.noble, mmaxfield, pvollan, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Source SubStation Alpha subtitles
none
Converted WebVTT segment to be rendered.
none
how libASS renders
none
How browser renders. none

Rafik Mikhael
Reported 2018-10-17 10:34:46 PDT
Created attachment 352581 [details] 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.
Attachments
Source SubStation Alpha subtitles (1.44 KB, text/plain)
2018-10-17 10:34 PDT, Rafik Mikhael 		no flags
Details
Converted WebVTT segment to be rendered. (1.60 KB, text/plain)
2018-10-17 10:35 PDT, Rafik Mikhael 		no flags
Details
how libASS renders (362.44 KB, image/jpeg)
2018-10-17 10:35 PDT, Rafik Mikhael 		no flags
Details
How browser renders. (363.85 KB, image/jpeg)
2018-10-17 10:36 PDT, Rafik Mikhael 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Rafik Mikhael
Comment 1 2018-10-17 10:35:39 PDT
Created attachment 352582 [details] Converted WebVTT segment to be rendered.
Rafik Mikhael
Comment 2 2018-10-17 10:35:57 PDT
Created attachment 352583 [details] how libASS renders
Rafik Mikhael
Comment 3 2018-10-17 10:36:17 PDT
Created attachment 352584 [details] How browser renders.
Radar WebKit Bug Importer
Comment 4 2018-10-22 10:49:04 PDT
<rdar://problem/45458144>
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