Fix Firefox and Safari Viewer bug(s) for MP4 files ingested as ephemera

[kelea99]

Summary (Product Owner)

I have ingested 4 MP4 videos to figgy in individual ephemera folders. These 4 videos view fine for @tpendragon in chrome. they do not view/play/move at all in firefox (and timer stays at 0:00/0:00 for all videos) or Safari. All viewers should be able to work for these videos and the external stakeholders leading this grant-funded project.

@hackartisan tested other videos she located via figgy faceting and they play fine in firefox.

User Story (Product Owner, when applicable)

As a [persona], I want to [describe intent], so that [explain the big problem you are trying to solve and its benefit]

Impact (Product Owner)

Please include hard deadlines, if the exhibit is part of an event, the issue is stopping work, etc.
This work is needed to complete phase for grant, that Jenn Garcon wrote letter of support for that includes the items being available in DPUL by next year. The soft launch was hoped to be by December 15, but not possible. Hard launch with larger programming is expected by 2025.

Priority recommendation (Product Owner)

• asap
• within the next 3 weeks
• PO will prioritize: Sudden Priority can wait until January 2025 workcycles.

Sudden Priority Justification (Product Owner)

Required if "asap" or "within the next 3 weeks" is checked. Add "Sudden Priority" and "dls-work-cycle" labels
This work is needed to complete phase for grant, that Jenn Garcon wrote letter of support for that includes the items being available in DPUL by next year. The soft launch was hoped to be by December 15, but not possible. Hard launch with larger programming is expected by 2025.

Implementation Notes

To be filled out by DLS.

Acceptance Criteria

To be filled out by DLS.Some requirements to consider, including:

• The UI implemented for this issue meets accessibility requirements
• New functionality is documented

First Step

To be filled out by DLS.

Expected behavior (Product Owner)

Actual behavior (Product Owner)

Steps to reproduce behavior (Product Owner)

Screenshots (Product Owner)

[kelea99]

see also: #6580