1131952 - (DASH-IF) text tracks aren't displayed

Status: NEW

(Core :: Audio/Video: Playback, defect, P5)

Description

[Chris Peterson [:cpeterson]]

As noted in bug 1131482, the first two bitdash demo videos ("Sintel") have subtitles in Chrome, but not Firefox. karlt says text tracks are part of the MSE spec.

* Sintel (Multilanguage & Subtitles) - SegmentTemplate:

http://www.dash-player.com/demo/streaming-server-and-encoder-support/?mpd=http%3A%2F%2Fbitcdn-global.bitmovin.com%2Fcontent%2Fsintel%2Fsintel.mpd

* Sintel (Multilanguage & Subtitles) - SegmentList:

http://www.dash-player.com/demo/streaming-server-and-encoder-support/?mpd=http%3A%2F%2Fbitcdn-global.bitmovin.com%2Fcontent%2Fsintel%2Fsintel-seglist.mpd

Comment 1

[Chris Pearce [:cpearce (Not reading bugmail)]]

I don't think this needs to block the EME MVP.

Comment 2

[Yury Delendik (:yury)]

The issue is not actually related to MSE. The captions are not shown because:

1. It's disabled on purpose for Firefox, see https://github.com/Dash-Industry-Forum/dash.js/blob/development/samples/dash-if-reference-player/app/main.js#L571
2. We don't support TextTrackCue.onenter/.onexit events (bug 996333)
3. We don't support ::cue styling (bug 865395)
4. The application uses non-standard CSSStyleSheet.addRule (implemented in IE and WebKit)

Comment 3

[Yury Delendik (:yury)]

Almost forgot:
5. The textTracks property of a video might not have track listed (bug 1206304)

Comment 4

[Yury Delendik (:yury)]

Changing the dependency to different meta bug. 

The CSSStyleSheet.addRule (from comment 2) was addressed via https://github.com/Dash-Industry-Forum/dash.js/pull/803. The main blocking bug now is bug 996333 -- implementing cue onenter/onexit events (rest of them can be fixed by workarounds).