RealMedia
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RealMedia is a proprietary multimedia container format created by RealNetworks with the filename extension .rm. RealMedia is
| 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[1] |
| Developed by | RealNetworks |
| Type of format | Container format |
| Open format? | No |
| Free format? | No |
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.
| Filename extension |
.rm, .rma, .rmi, .rmv, .rmvb, .rmhd, .rmm, .ra, .ram |
|---|---|
| Internet media type | application/vnd.rn-realmedia |
| Type code |
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 |
| Uniform Type Identifier (UTI) | com.real.realmedia[2] |
| Developed by | RealNetworks |
| Type of format | Container format |
| Open format? | No |
| Free format? | No |
Overview
[edit]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
[edit]- 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
[edit]- 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
[edit]- 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
[edit]- ^ "System-Declared Uniform Type Identifiers". Uniform Type Identifiers Reference. Apple Inc.
- ^ "System-Declared Uniform Type Identifiers". Uniform Type Identifiers Reference. Apple Inc.
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