RM is a multimedia container format created by RealNetworks. RealMedia file extension is *.rm. It is typically used in conjunction with RealVideo and RealAudio and is popular for streaming content on the Internet.

WMA is Windows Media Audio. WMA is a new audio format developed by Microsoft well known as MP3. With a higher rate in files compression and better sound quality than the latter, even far beyond those of RA.


To convert rm to wma, please install the latest RealPlayer if Windows has not installed it. Download RealMedia Splitter. Unzip the file with WinRAR, use the command line "regsvr32" to register it. Or download the bat file to Release folder to register.

Download WMA Converter which can convert rm to wma file. Select a rm file, set the start time, the end time or audio encoding bitrate if needed. The bitrate is bigger, the file size is bigger, the audio quality is higher, and vice versa. Click the Convert button to convert rm to wma.




H.261 is the first practical digital video coding standard designed by ITU-T to develop conference TV and video telephony on ISDN. It becomes the design framework of later International Standard of Video Coding including MPEG-1, MPEG-2/H.262 and H.263. H.261. It only deals with CIF and QCIF image formats by dividing every frame into images layer, Acer block group layer, Acer block and block layer. H.261 output rate is constant, while the image quality is unsteady.

H.263 is the standard draft of ITU-T designed for low bit-stream communications. Actually the standard could be used in broader bitstream scope but not limit to low bit-stream. Whatís more, itís thought to be used to replace H.261.The coding algorithm of H.263 is the same with that of H.261.but thereíre still some differences. e.g. H.263 adopts semi-precision for motion compensation while H.261 adopts all pixel accuracy and filtering cycle; H.263 contains four consultable options to improve performance.

After install H.261 or H.263 decoder, wma converter can convert h.261/h.263 to wma file.

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