Posted by : Febriansyah Haq Selasa

Media files are usually large, and in order to be processed and shipped (via the internet, cd room etc.), the files are usually compressed in advance, so do not take up storage capacity or also called Lossy or Lossless compression means more data is stored and delete the details- details that are not conspicuous ears or eyes, such as movies, will keep the frame in sequence.
And if you want to save on storage capacity, we only save the first frame in the sequence and the variation between the frames afterwards. However, if compressed again will be increasingly felt, so we have to balance between image quality or sound to create a file size.
Some codecs and file formats are:
AUDIO FORMAT
AAC (Advanced Audio Codec) is a lossy compession system for audio files, developed by the Motion Picture Expert Group (Fraunhofer Institute, Dolby, Sony, Nokia and AT & T) to replace MP3. This extension of the MPEG-2 standard and has its own advantages compared to MP3, the compression is more efficient with the sound quality better audio and multichannel audio support.
AIFC and AIFF (Audio Interchange File Format) is an uncompressed file format, developed by Apple on Machintosh and Unix platforms.
MP3: MP3 (MPEG-1 / 2 Audio Layer 3) is the most poluler audio formats. Using a lossy audio compression algorithms to reduce file size, while memprouksi return the original. MP3 was developed at the German Fraunhofer Institute and MPEG-based formats (see the video format). MP3 experiencing glory in 1995, where a growing number of MP3 files available diinternet and further boost its popularity because of its quality and capacity to be relatively very small. MP3 compression can be performed with varying bit-rate. A good standard for audio quality and file size is 128 Kbps, to find quality approaching CD quality bit-rate required 192 kbps. Quality CD and MP3 are difficult to distinguish on the bit-rate of 192 kbps. In 2001, MP3 Pro introduced the next generation and offers superior sound quality and compression that have been improved, but because there is no free mp3PRO decoder, which is actually outside the usual format has not been able to replace the MP3 standard.
Ogg and Ogg Vorbis: Ogg is a free multimedia format designed for streaming and storage effiesien. This format was developed by the Xiph.org Foundation. Similarly Vorbis audio codec which is free. Ogg Vorbis is usually installed together, so comes the name Ogg Vorbis. The launch of the format and the codec is actually a response to the plan in 1998 MP3 owners who want to charge a license for MP3 format. OggVorbis very popular open source, because the quality and its free. But until now although free, is still a bit player supports this format, one that is known is that winamp supporting the Ogg Vorbis format.
RealAudio: is an audio codec developed by Real Networks in 1995. This codec was originally developed untruk low bandwidth transmission. Information can be used for streaming audio and can run as an audio file is still downloading. RealAudio is widely used by radio stations to stream their programs via the Internet in real time. RealNetworks also offers free and paid software player called RealPlayer, but for the free ones can not save the audio stream as a file.
WAV (WAVE-form): is the audio standard developed by Microsoft and IBM, WAV was the main format for storing raw audio data on Windows and using the same method with AIFF Apple to store data. WAV using the technique pulse-code modulation (PCM) are not compressed. In this way, details are not lost when analog audio digitized and stored. This makes the WAV format (using PCM) be the choice for high-fidelity audio editing. However, for purposes of collecting music, transfer via the internet and play diplayer portable, this format is less popular than MP3, Ogg Vorbis and VMA due to a very large file sizes.
WMA (Windows Media Audio) is a codec for lossy compression, which was first developed to rival MP3 ujua by Microsoft. While Microsoft is positioning it to compete with AAC WMA is used in Apple products like iPods and the iTunes Music Strore. WMA also uses Digital Rights Management systems such as the AAC for the protection and limit duplication playback on a PC or a specific device. WMA audio stream is almost always with the ASF file. If only carry audio data, the bias file has the extension. WMA. There is also a lossless version for multichannel surround sound and voice encoding (WMA Voice).
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