what is mp4?

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  • 1 decade ago
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    Most downloadable music on the Internet is currently available in the MP3 format. MP3 is a file format that allows computer users to download and store music in a relatively small amount of hard drive space. As a general rule, one minute of music requires 1 MB of storage space. The technology is used widely by aspiring musicians who wish to distribute their music to a global audience. It is also used by individuals who wish to copy their existing audio CD into a digital format for playback on their computer or a portable music device.

    MP3 is an audio-specific compression format. It provides a representation of pulse-code modulation-encoded audio in much less space than straightforward methods, by using psychoacoustic models to discard components less audible to human hearing, and recoding the remaining information in an efficient manner. Similar principles are used by JPEG, a lossy image compression format.

    The MP3 format uses a hybrid transformation to transform a time domain signal into a frequency domain signal:

    32-band polyphase quadrature filter

    36 or 12 tap MDCT; size can be selected independent for sub-band 0...1 and 2...31

    Aliasing reduction postprocessing

    MP3 audio can be compressed with different bit rates, providing a range of tradeoffs between data size and sound quality.

    The term MP4 has been claimed as a brand name by Internet company Global Music Outlet (GMO). The company is probably benefiting from confusion among Web music fans who seek an upgrade to MP3. While GMO's own MP4 technology does offer improved compression and audio over the popular MP3 standard, it is not the official successor to MP3. That title goes to the MPEG-4 audio standard developed by the International Standards Organization.

    The MPEG-4 standard, which was completed in October 1998, is an object-based format that encompasses much more than music. It also addresses the next generation of digitally delivered multimedia, including video and 3D applications.

    What is an MP4?

    Just like MP3s work by compressing music and audio files without affecting the audio quality, MP4 files are compressed video files. MP4 is also known as MPEG-4 AVC, or advanced video coding. This new technology is going to make video files decrease in size so that they are easier to work with and support. What used to be massive video files of motion and audio are now compressed versions of the same material, called MP4s.

    How MP4 Technology Works

    MP4 files work through compression; similar to how MP3 audio files are compressed, except these are more complex. The way these videos are compressed into very small files without affecting the quality is through dealing with specific coding issues, minimizing certain aspects, such temporal and spatial redundancies, transforming motion estimation and intra estimation into the frequency domain, and generally through compression and decompression, commonly referred to as codec.

    The MP4 player works in a very simple manner. You simply purchase the “sold separately” electronic device and attach it to your computer, notebook, or TV. It’s that easy.

    Advantages of MP4 Technology

    MP4s produce videos of DVD-quality at less than 1 Mbps through a broadband connection. This means that with an MP4 player, you can retrieve videos through an Internet connection and watch them with your MP4 player. MP4 players can also play lower MP versions, such as audio MP3s.

    Its just as small as mp3's and sounds 100 percent better

    its AAC

    its M4a Low Complexity

    and its Far out Baby !!!

    To Play MP4 Songs you will need Quicktime 6.0 to 6.3 ... for any computer

    MP4 is the world standard and Micorsoft doesn't support standards. Media Player 9 still does not play MP4 audio YET.

    Real One may support it .. let us know. Email 58Th Street Studio

    We use 128 Kb/s

    MPEG-4 was built on technology developed for the Apple QuickTime format. It is specifically designed for data 'streaming' - transmitting data streams which can be viewed and heard on the receiving device (usually a computer connected to the Internet) in real-time. It supports a number of different formats for video (MPEG-4, MPEG-2, MPEG-1), audio (MP3, MP2, AAC), still images (JPEG, PNG) and subtitles.

    MPEG-4 is designed to be expandable so it can be adapted to include new technologies as they are developed. As a container, it can be scaled for various data transmission rates. This means that it is useful for most types of streaming from dial-up modems to Ethernet networks.

    Although streaming is the method of delivery, MP4 files can be stored for later use. This makes the format suitable for portable devices of which a number of new models are hitting the market. MP4 players are the new wave of portable entertainment devices allowing consumers to watch videos virtually anywhere.

    Since MP4 is not limited to video, MP4 players are also used for listening to audio files. They tend to be a bit bulkier than MP3 players because of the bigger screen required for viewing videos.

    MP4 players usually have a hard drive because the storage requirements for videos are quite high. The hard drive can also be used to store computer data and the unit behaves as a removable hard drive when connected to a computer.

    MP4 files are recognized by the file extension .mp4, although a number of other extensions are also used. Audio files usually have an .mp4 or .m4a extension and video can use the .mp4 or .m4v extension. Video files are sometimes saved as .mp4v files.

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  • 1 decade ago

    MPEG-4 Part 14, formally, ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. It is most-commonly used to store digital audio and digital video streams, especially those defined by MPEG, but also can be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4. Devices that play .mp4 files are referred to as MP4 players.

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  • me
    Lv 4
    1 decade ago

    mp4 is a file format. it is a audio-video file. it is used commonly in ipod's and psp's as a movie format

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  • 1 decade ago

    It is almost the same thing as an ipod

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  • Anonymous
    1 decade ago

    nuthing... how about an MP3??? it is a music player that is handheld : )

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