M4V is a digital video container format developed by Apple Inc. It is pretty similar to the popular MP4 in terms of structure, but M4V files can sometimes be DRM protected. Today, M4V is the primary video format for iTunes Store videos and can multiplex together multiple audio and video data.
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Although not a format itself, Facebook has some technical requirements regarding the type of audio/video format it supports. While most file formats are supported, it’s best to use either MP4 or MOV. Also, the video compression codec should be in H.264 with AAC sound compression at 128kbps+. You can convert any video file type to Facebook using programs such as Wondershare UniConverter, VLC Media Player, Aiseesoft Video Converter Ultimate, and more.
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