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Understand what kinds of metadata can appear in MP4 files — timestamps, device tags, software export details — before you strip or pack for upload.
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MP4 files can contain format details, timestamps, software tags, and other descriptive information besides the media stream. After you understand what is present, use Metadata Strip to remove leaky fields, then run Platform Readiness or a platform pack before upload.
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Open Metadata Strip (container purge) and run the steps from this guide.