RMVB (RealMedia Variable Bitrate) is a digital variable bitrate extension for the RM (RealMedia) container format. Unlike the standard RM format that streams content in CBR (Contant Bitrate), the RMVB, as the name suggests, streams local media in VBR (Variable Bitrate). This file format uses a .rmvb filename extension.
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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)