Formato file

Informazioni sui file RA

RA (RealAudio · Formato audio)

Rilasciato 1995 Di Progressive Networks (RealNetworks)

RealAudio (.ra) è un formato di file standard supportato da KaijuConverter per l’archiviazione, la condivisione e la conversione multipiattaforma.

Famiglia

Audio Files

Estensione

.ra

Tipo MIME

audio/vnd.rn-realaudio

Utilizzabile come

Input

La storia

COME RA
È NATO.

RealAudio — .ra — was the internet’s first practical streaming audio format. Progressive Networks shipped RealAudio 1.0 in April 1995 at a time when downloading a single MP3 over dial-up took half an hour. RealAudio compressed speech into a 20 kbps bitstream that could stream over 28.8 kbit/s modems in real time — enough quality for talk radio and news. It launched the internet streaming industry: ESPN, NPR, BBC, ABC all served their news and interviews as RealAudio through the late 1990s.

RealAudio’s story eventually merged with the broader collapse of RealNetworks — users got tired of bundled adware, newer formats (Windows Media, Flash Audio, then MP3 progressives via iTunes) took over. Standalone .ra files still exist in archives of late-1990s broadcasting. The .ram metadata files that used to tell RealPlayer where to fetch streams are also commonly mistaken for .ra audio files — they are just text playlists pointing at stream URLs.

CURIOSITÀ E
ANEDDOTI.

RealAudio 1.0 (1995) was the first codec practical for streaming voice over 28.8 kbit/s dial-up modems.

NPR, BBC, ESPN, and ABC News all streamed daily programming as RealAudio throughout the late 1990s.

RealNetworks briefly made the RealPlayer the most-downloaded software on Earth, peaking at ~90 million installs.

The bundled adware and aggressive nag screens of RealPlayer in the early 2000s became internet-famous — a cautionary tale about consumer software behavior.

Standalone .ra files are often paired with .ram metadata files — the .ram is a text playlist, the .ra is the actual audio.

PUNTI DI FORZA E
LIMITAZIONI.

Punti di forza

Extremely low-bitrate streaming viable on 1990s modems.
Historic archive value for late-1990s broadcasting.
Codec variants for voice and music (RAC, cook, sipr).

Limitazioni

Proprietary and commercially abandoned.
No modern player auto-installs RealAudio support.
RealNetworks damaged its own brand with aggressive adware.
Modern replacements (Opus, HE-AAC) outperform RA at every bitrate.

Dimensioni e pesi tipici

5-min RealAudio news clip (20 kbps)

~750 KB

1-hour music stream (64 kbps)

~28 MB

Specifiche tecniche

MIME type: audio/vnd.rn-realaudio
Extensions: .ra, .ram (playlist metadata)
Codecs: RealAudio Cook, ATRAC3, SIPR
Parent format: RealMedia (.rm)
Native player: RealPlayer (legacy)

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CONVERTI DA
RA

ra mp3 ra wav ra flac ra aac ra m4a ra ogg ra opus ra wma ra aiff

Casi d'uso comuni

Legacy streaming audio