RAM (Real Audio Media) is a flexible audio format developed by RealNetworks in 1995. Initially, it was intended to stream audio/video clips over the internet. It is designed in a way that users can listen to content while the file is still downloading. Today, many radio stations use it to broadcast content online.
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OGV is a digital video container format related to the encoding technology of the OGG Vorbis video. It can save multiple related video stream codecs like the DivX and Theora. It is these codecs that allow OGV files to open on varying media players.
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