Bug 108038 – [Chromium] Regression: paint-on captions stopped working in recent builds

• Status: RESOLVED
• Resolution: WONTFIX
• Component: Media

[Silvia Pfeiffer]

Paint-on captions such as the first few cues in http://swarm.cs.pub.ro/~victor/track/karaoke.html used to work in Chromium. Some recent changes broke it - however, Safari Nightly still works fine.

[Silvia Pfeiffer]

Victor pointed out that we now require <c> elements as in
http://trac.webkit.org/browser/trunk/LayoutTests/media/track/captions-webvtt/styling-timestamps.vtt
to do successive cue text painting. While W3C bug https://www.w3.org/Bugs/Public/show_bug.cgi?id=16875 isn't resolved, that's probably correct. Though I don't understand why Safari nightly behaves differently.

[Dima Gorbik]

(In reply to comment #1)
> Victor pointed out that we now require <c> elements as in
> http://trac.webkit.org/browser/trunk/LayoutTests/media/track/captions-webvtt/styling-timestamps.vtt
> to do successive cue text painting. While W3C bug https://www.w3.org/Bugs/Public/show_bug.cgi?id=16875 isn't resolved, that's probably correct. Though I don't understand why Safari nightly behaves differently.

This test that I've added should check this behavior. I couldn't load http://swarm.cs.pub.ro/~victor/track/karaoke.html (the video is in webm) but it works as it is expected on my tests in the nightly build. Could you please attach a reduction that doesn't work for you?