RM is video container format which is used in conjunction with the program RealPlayer. The format contains audio or video data or a link to a streaming media file. RM is commonly used for streaming content over the Internet and is therefore very important for Internet radio and Internet videos.
WMA is a proprietary audio container format of Microsoft. There are 4 codec used in WMA – WMA, WMA Professional, WMA Lossless and WMA Voice. It uses one of the four WMA codec to encode audio. WMA contains the audio file in Advanced Systems Format (ASF) format. The ASF file decides how the metadata will be encoded.
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