RM (Real Media) files are a multimedia container format which can carry audio and video streams encoded using RealNetwork's proprietary RealAudio and RealVideo codecs. RM files are similar to other container formats developed primarily for streaming video over the Internet such as MPEG4 in that both the video and audio streams can be heavily compressed to ensure smooth playback over most Internet connections. However, RM files only contain streams encoded using RealNetwork's proprietary codecs, whereas formats such as MPEG4 allow different streams to utilise different formats which allow for greater control over the quality of both audio and video.

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