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Dec 22, 2014 6:40 AM in response to ProblemGuy999by Jason L,Hi ProblemGuy999,
Welcome to Apple Support Communities.
The article linked below describes the video cannot be copied alert that you’re seeing when attempting to sync that specific MP4 to your iPhone 5s.
iTunes: Videos may be unable to sync to iPhone, iPad, or iPod - Apple Support
iTunes can play a wide variety of video formats; however, iPhone, iPad, and video-capable iPod devices play videos in specific formats. To learn which video formats are supported:
- Go to the technical specifications.
- Click your device's product family.
- Click your specific model.
Learn more about playing and syncing High Definition (HD) content.
And, here’s the technical specifications for your iPhone 5s:
Apple - iPhone 5s - Technical Specifications
Video formats supported: H.264 video up to 1080p, 60 frames per second, High Profile level 4.2 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
Take care,
-Jason
