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UW intermittently gets stuck at 'assembling' state on large videos
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When uploading dozens of several-hundred-mb video files, I sometimes end up with things hung where one file was left in 'assembling' state seemingly forever. Nothing obvious visible in JS console.

Workaround: remove the broken file and re-add it.

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Are you sure it's a problem with UploadWizard and not MediaWiki getting stuck? UW tries to wait for 10 minutes for MW to finish the job before failing. (mw.UploadWizardDetails#handleSubmitResult)

(At least it should be, I haven't verified that code myself.)

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We don't think there have been any problems of this nature for some time, but feel free to reopen if it's still reproducible.