RealMedia

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RealMedia

Filename extension	.rm, .rma, .rmi, .rmv, .rmvb, .rmhd, .rmm, .ra, .ram
Internet media type	application/vnd.rn-realmedia
Uniform Type Identifier (UTI)	com.real.realmedia
Developed by	RealNetworks
Type of format	Container format
Open format?	No
Free format?	No

RealMedia is a proprietary multimedia container format created by RealNetworks with the filename extension .rm. RealMedia is generally used in conjunction with RealVideo and RealAudio, while also being used for streaming content over the Internet. Typically these streams are in CBR (constant bitrate), but a container for VBR (variable bitrate) streams named RMVB (RealMedia variable bitrate) has been developed.

Overview

A RealMedia file consists of a series of chunks that can be of several different types:

• .RMF: RealMedia file header
• PROP: File properties header
• MDPR: Media properties header
• CONT: Content description header
• DATA: Data header
• INDX: Index header

Supported audio formats

• RealAudio 1.0 (VSELP), IpcJ
• RealAudio 2.0 (LD-CELP), 28_8
• AC3, dnet
• Sipro, sipr
• cook, cook
• ATRAC3, atrc
• RealAudio Lossless Format, ralf
• LC-AAC, raac
• HE-AAC, racp

Supported video formats

• ClearVideo (from helix spec)
• H.263, RV10
• H.263, RV13
• H.263+, RV20
• H.264 precursor, RV30
• H.264 precursor, RV40
• H.263+ (RV20), RVTR
• H.265, RMHD

See also

• RealPlayer
• Container format
• Comparison of video container formats
• Comparison of video player software
• RealVideo codecs
• RealAudio codecs
• Helix Community - the free and open source software project from RealNetworks

References

1. ^ "System-Declared Uniform Type Identifiers". Uniform Type Identifiers Reference. Apple Inc.

v t e Multimedia compression and container formats
Video compression	ISO, IEC, MPEG DV MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 Part 2 MPEG-4 Part 2 / ASP Part 10 / AVC Part 33 / IVC MPEG-H Part 2 / HEVC MPEG-I Part 3 / VVC MPEG-5 Part 1 / EVC Part 2 / LCEVC ITU-T, VCEG H.120 H.261 H.262 H.263 H.264 / AVC H.265 / HEVC H.266 / VVC SMPTE VC-1 VC-2 VC-3 VC-5 VC-6 TrueMotion TrueMotion S VP3 VP6 VP7 VP8 VP9 AV1 Others Apple Video AVS Bink Cinepak Daala DVI FFV1 Huffyuv Indeo Lagarith Microsoft Video 1 MSU Lossless OMS Video Pixlet ProRes 422 4444 QuickTime Animation Graphics RealVideo RTVideo SheerVideo Smacker Sorenson Video/Spark Theora Thor Ut WMV XEB YULS
Audio compression	ISO, IEC, MPEG MPEG-1 Layer II Multichannel MPEG-1 Layer I MPEG-1 Layer III (MP3) AAC HE-AAC AAC-LD MPEG Surround MPEG-4 ALS MPEG-4 SLS MPEG-4 DST MPEG-4 HVXC MPEG-4 CELP MPEG-D USAC MPEG-H 3D Audio ITU-T G.711 A-law µ-law G.718 G.719 G.722 G.722.1 G.722.2 G.723 G.723.1 G.726 G.728 G.729 G.729.1 IETF Opus iLBC Speex Vorbis 3GPP AMR AMR-WB AMR-WB+ EVRC EVRC-B EVS GSM-HR GSM-FR GSM-EFR ETSI AC-3 AC-4 DTS Bluetooth SIG SBC LC3 Others ACELP ALAC Asao ATRAC AVS CELT Codec 2 DRA FLAC iSAC Lyra MELP Monkey's Audio MT9 Musepack OptimFROG OSQ QCELP RCELP RealAudio RTAudio SD2 SHN SILK Siren SMV SVOPC TTA True Audio TwinVQ VMR-WB VSELP WavPack WMA MQA aptX aptX HD aptX Low Latency aptX Adaptive LDAC LHDC LLAC L2HC
Image compression	IEC, ISO, IETF, W3C, ITU-T, JPEG CCITT Group 4 GIF HEIC / HEIF HEVC JBIG JBIG2 JPEG JPEG 2000 JPEG-LS JPEG XL JPEG XR JPEG XS JPEG XT PNG TIFF TIFF/EP TIFF/IT Others APNG AV1 AVIF BPG DjVu EXR FLIF ICER MNG PGF QOI QTVR WBMP WebP
Containers	ISO, IEC MPEG-ES MPEG-PES MPEG-PS MPEG-TS ISO/IEC base media file format MPEG-4 Part 14 (MP4) Motion JPEG 2000 MPEG-21 Part 9 MPEG media transport ITU-T H.222.0 T.802 IETF RTP Ogg SMPTE GXF MXF Others 3GP and 3G2 AMV ASF AIFF AVI AU BPG Bink Smacker BMP DivX Media Format EVO Flash Video HEIF IFF M2TS Matroska WebM QuickTime File Format RatDVD RealMedia RIFF WAV MOD and TOD VOB, IFO and BUP
Collaborations	NETVC MPEG LA Alliance for Open Media
Methods	Entropy Arithmetic Huffman Modified LPC ACELP CELP LSP WLPC Lossless Lossy LZ DEFLATE LZW PCM A-law µ-law ADPCM DPCM Transforms DCT FFT MDCT Wavelet Daubechies DWT
Lists	Comparison of audio coding formats Comparison of video codecs List of codecs
See Compression methods for techniques and Compression software for codecs

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