M4A is a filename extension for AAC container format and is developed by Apple Inc. M4A music is bought on the iTunes Store and does not come with DRM protection. In terms of quality, M4A is better than MP3 because it is lossless but still compressed. This means that it occupies less storage space and doesn’t lose quality over time.
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MXF (Materia Exchange Format) is an audiovisual container format developed by SMPTE. It contains full metadata and timecode support and is considered as the future standard for audio and video applications. Theoretically, MXF can streamline data between different platforms, like servers and digital cameras.
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SMPTE (Society of Motion Pictures and Television Engineers)