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MP4 file format - Wikipedia
Bug] - Trying to upload a `video/mp4` with `binary` encoding fails · Issue #136 · abramenal/cypress-file-upload · GitHub
Need Help: Unable to upload MP4 videos on web or app, got error message: “Your video file is not compatible. Please see tips for uploading videos.” - Media APIs - Twitter Developers
Sample MP4 video files
You can now test MP3 and MP4 files with Design surveys - UsabilityHub updates
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