Playing mp4 fails occasionally

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I am sharing mp4 files via the advanced video sharing option. Works fine with all the videos I download from YouTube. When users provide me with an mp4 from their own sources these files play fine outside of Zoom so I assumed they would be OK in Zoom as shared videos. However occasionally these files fail to share in Zoom with a "Bad format" message. Any idea why?

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Effective January 9th, 2026 through January 22nd, 2026: The Zoom Community is currently in read-only mode with login disabled, to deliver you a new and improved community experience!