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IndexSizeError: The index is not in the allowed range (improve video support on mobile iOS devices)
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Description

With 2,315 errors on group 2 wikis, 4,830 on group 1 wikis this is one of our most prominent JavaScript errors

It has no stack trace or file url but mostly impacts webm and ogv files on iOS devices (Chrome and Safari) on mobile domains, so I assume this relates to support for those file formats on mobile devices.
https://logstash.wikimedia.org/app/dashboards#/doc/logstash-*/logstash-2021.05.06?id=J3BrP3kBfVMx58vqdERH

Event Timeline

TheDJ triaged this task as Lowest priority.Dec 19 2021, 9:55 PM
TheDJ added a subscriber: TheDJ.

Without a stacktrace, it's gonna be pretty hard to figure out where this problem is.

matmarex claimed this task.
matmarex added a subscriber: matmarex.

Kaltura player is not longer maintained. The issue doesn't seem to occur in VideoJS player, judging by the error logs after T248418:
https://logstash.wikimedia.org/goto/fb4b7d426573b205f2772a1078062b4b

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