What Is an MP4 File (and How Do I Open One)? - How-To Geek
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WebSep 7, 2018 · A file with the .mp4 file extension is an MPEG-4 video file format. MP4s are one of the more common video file formats used for downloading and streaming videos from the internet. It's a highly versatile and compressed video format that also can store audio, subtitles, and still images. Related: What Is A File Extension? What Is an MP4 File?
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