Convert MP4 to MP3
You can convert MP4 file to MP3 as well as to variety of other formats with free online converter.
How to convert mp4 to mp3?How to convert mp3 to mp4?
MPEG-4 Video File
MP4 is one of the most popular formats for multimedia storage and distribution. It is a container for processing of wide data range, from text and graphics to sound tracks and video. Also it is able to support high-quality files, such as 3D-graphics or user’s menus. It is provided in two versions: MPV (for audio) and M4A (for video). A less known extension .mpr is being used for ringtones.
MP4 files may be played by a number of programs, including Adobe Flash, Roxio Creator, Nero Multimedia Sulte, and a default plug-in Windows Media Player. They are adapted for Mac OS and supplied by modern portable players.
MP4/MPEG-4 has been widely used since 2001. By its nature, it is similar with MP3 although more technically complex. It involves AAC coding method and complies with the standards of ISO/IEX 14496-1. Video and audio contained in a MP4 file is usually played in real time. Thanks to extra information (e.g. file name or images) it differs significantly from MPEG. Often it is impossible to embed data in such a file without use of separate streams that commentary tracks are integrated to.
MP3 Audio File
MP3 is a digital format for storage of audio files designed by MPEG programmers. It is one of the most required codecs for digital coding. The format is widely used in various file-sharing sites for evaluation downloading.
With this format, it is possible to compress CD tracks up to 1/10 of their original size while maintaining high playback quality. Overtones, which cannot be perceived by a human ear, are removed. Complex algorithms allow for smaller size of tracks. As a result, one compact disk can contain several hundred songs. MP3 is compatible with all most popular operating systems and supported by the most of modern DVD-players and music systems.
Prior to MP3 introduction, MPEG-1 had been widely used. That format contained not only audio data, but images as well. MP3 breaks an audio file into parts of the same length. When the processing is over, each part is packed into its own frame. It involves the technology of spectral limit that requires a continuous input signal to provide the use of two adjacent frames.
When spectral deleting is over, the file is to be compressed with mathematic methods. If necessary, compression rate can be changed, even inside the same frame. Files of 128 kbit/s have 11-fold compression. Further reduction of the file size will lead to significant deterioration in sound quality.