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Video subtitles display only occasionally in Firefox
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Description

Subtitles display intermittently in Firefox. For example, try to play https://commons.wikimedia.org/wiki/File:%C2%BFQu%C3%A9_es_Wikipedia%3F.ogv from https://meta.wikimedia.org/wiki/Grants:IEG/Motivational_and_educational_video_to_introduce_Wikimedia/Scripts#The_principles_and_WP:FIVE_Pillars_of_Wikipedia.

If a file is displayed on Commons and a language is selected in the "Language select" box instead of or in addition to using the CC button, the subtitles sometimes display.

I have not determined the exact combination of uses of the "Language select" box and the CC button that cause subtitles to display properly. Regardless, the user should not need to struggle in order to get subtitles to display.

Also, it's confusing to have both a "Language select" box and a CC button which may be selected to conflicting languages.

Event Timeline

Pine created this task.Jul 13 2016, 5:15 PM
Restricted Application added subscribers: Zppix, Matanya, Aklapper. · View Herald TranscriptJul 13 2016, 5:15 PM
Pine renamed this task from Subtitles are not displaying in Firefox in the popup window to Video subtitles display only occasionally in Firefox.Jul 13 2016, 5:16 PM
Pine added a comment.Jul 13 2016, 5:23 PM

Please note that this bug is a big deal for my IEG video project, and I imagine that it affects Fundraising and others who use video subtitles as well. I would like to triage this as high priority if that's OK.

--> TimedMediaHandler code.

Pretty sure this is the same problem as T122737 - at least the "network" tab of the Developer Tools in Firefox shows the same 404s due to the missing namespace in the URL. Hence merging as duplicate.

TheDJ edited projects, added TimedMediaHandler; removed Multimedia.Jul 13 2016, 8:46 PM
TheDJ added a subscriber: TheDJ.Jul 13 2016, 8:55 PM

Little intermittently about it. It's plain broken, see latest tickets on T122737. I'm having trouble finding reviewers for the code, and have little time atm to go chasing after people and do follow up etc etc.

if a file is displayed on Commons and a language is selected in the "Language select" box instead of or in addition to using the CC button, the subtitles sometimes display.

They always display for me personally really. Only not Danish.. I suspect that that specific track is broken.

Also, it's confusing to have both a "Language select" box and a CC button which may be selected to conflicting languages.

The language select box is a local commons javascript. I don't think the player listens to it at all. (Nor should it).