WMA (Windows Media Audio) is a collection of multiple sound codecs and their respective coding formats. It was developed by Microsoft in 1999 as part of its Windows Media framework. WMA features up to four codecs, including WMA, WMA Pro, WMA Lossless, and WMA Voice. Each codec has its own distinct function.
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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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