: The file extension. MP4 (MPEG-4 Part 14) is a digital multimedia container format. While ubiquitous today, in the early-to-mid 2000s, MP4 was still competing with AVI, WMV, and MOV. The use of MP4 suggests the file was created after roughly 2003-2004, when MP4 gained popularity for its efficient compression and support for both video and audio.
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