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  • Back to main F.A.Q: Real Audio and Video


    1. Can I stream Real Audio and Video.
    2. Where can I find more about Real Audio.
    3. General Information on Real Audio.

    1. Can I stream Real Audio and Video. - Top

    Yes you can stream real audio and video with any hosting plan.





    2. Where can I find more about Real Audio. - Top

    RealAudio.com

    Real Audio Help

    Search Real Audio Knowledge Base

    3. General Information on Real Audio. - Top

    The following information contains general information about
    RealAudio. Specific questions about its features and functions
    should be addressed to sales@realaudio.com.

    What is RealAudio?

    RealAudio refers to a client-server based system which allows
    web sites to deliver (or "stream") pre-recorded and live
    compressed audio data to multimedia computers with a RealAudio Player.
    The Player continuously decompresses the audio stream and plays it in
    real time, on demand. Unique flow control technology allows computer
    users with sound cards to listen to whole clips, or just sections,
    when they want, as often as they want.

    Not counting the player, the system has two components, the
    RealAudio Encoder and the RealAudio Server.

    RealAudio Encoder
    The encoder is a software only solution (no proprietary hardware
    required) and is used to
    convert the live or prerecorded content into the RealAudio or
    RealVideo formats. The 3.0 Encoder will encode .wav, .au and live
    raw audio data including sound from CD players, tuners, microphones
    and mixing boards. Download RealAudio Encoder from:

    www.realaudio.com/products/encoder/realaudio/

    RealAudio Server
    RealAudio 3.0 features broadcast quality audio over the Internet for
    the first time. RealAudio 3.0 technology introduces stereo sound to
    28.8 Kbps modem users. Version 3.0 also introduces scaleable bandwidths
    between 28.8 Kbps connections and ISDN connections and above, producing
    near CD quality sound at ISDN connections and beyond. Content providers
    can select from multiple codecs at the same bandwidths to enable them to
    customize RealAudio sound for different content types.

    The delivery system has been enhanced by improving the communication
    reliability with Robust UDP and other features designed to improve sound
    quality, including PerfectPlay (with the RealAudio Player Plus) and
    Bandwidth Negotiation. Download a RealAudio 3.0 Server license from:

    www.realaudio.com/products/server/

    How Does the System Work?

    RealAudio technology utilizes an interactive system between the RealAudio
    Server and the RealAudio Player to enable real-time audio delivery over
    the Internet. When the user clicks on a link on a Web page, the audio
    buffers and then begins to play, all within a few seconds. This gives
    the deceiving impression that the RealAudio file is linked directly to the
    Web page. In reality, information is passing between the Web server
    supporting the Web page, the RealAudio Server supporting the audio file,
    and the RealAudio Player. When the user clicks on the RealAudio link,
    it is actually activating a metafile, which in turn sends the location
    of the RealAudio file to the Player. The Player then sends a signal to the
    RealAudio Server requesting that file. The file is sent to the Player
    and played as it is received. The entire process is completed within seconds.

    How Does One Deliver Live Content?

    The RealAudio and Video system will allow you to stream prerecorded files
    on demand from your web pages. It will also allow streaming of live content
    in realtime. Real-time encoding and serving technology allows organizations
    to broadcast live events including breaking news stories, sporting events,
    corporate meetings, and more, live, as they're happening, without time delays.

    In a live situation, the RealAudio or video encoder must be connected to the
    Real server so that the incoming audio or video can be compressed into the
    Real format and be streamed over the internet (or intranet). Clearly, this
    assumes you'll need two machines...one for the encoder and one for the server.
    Generally, when doing live encoding, the encoder should be run on its own
    dedicated machine! Additionally, the encoder may be at a remote location
    apart from the server (perhaps at the live event or radio station in question)
    or it may be on the same network as the RealAudio/Video server. In situations
    where the RA/RV encoder will be remote you may send the newly created RA/RV
    stream from the RA encoder to the RA/RV server simply by specifying the
    destination of the server. The stream will then be sent over the Internet
    via TCP/IP to be received by the server...and then multiplied and streamed
    out to the listners. When the encoder is remote, you can send the stream to the
    server via:

    a dedicated internet connection (min. 56kbs or 64k ISDN)

    satellite

    The experienced audio technician may seek professional results by experimenting
    with a number of different techniques including compression, noise gating,
    equalization and normalization equipment. A list of such equipment as well
    as other hints for getting the best sound with RealAudio can be found here:

    www.realaudio.com/help/content/audiohints.html#Other_Refs

    What are the Memory and Sound Requirements?

    The RealAudio server allows you to freely stream your live content without
    saving it to hard disk, thus making for a maintenance free system that wont
    fill your hard drive with large files on a daily basis. However, in some
    instances you may want to archive live content for play back at a later time.
    The RealAudio server provides such an option.

    Audio Storage
    Depending upon the level of audio compression, RealAudio files require hard disk space
    equal to approximately 1.1 - 2.4 kilobytes per second of audio.
    Sound Requirements
    RealAudio will encode most common monaural PC formats. RealAudio 2.0 comes with two
    audio encoding algorithms. The RealAudio 14.4 algorithm provides AM sound quality, while
    the 28.8 algorithm offers FM sound quality.
    EXAMPLES OF AUDIO FILE STORAGE REQUIREMENTS:

    Program length RealAudio RealAudio

    14.4 kbps 28.8 kbps

    1 hour 3.6 MB 8MB
    5 hours 18 MB 40MB

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