How to find the correct format for MP4 5

1. **MP4 format means a multi-computer file format using MPEG-4, sub-file name MP4, which is mainly used to store digital audio and digital video. In addition, mp4 can be understood as mp4**, mp4** is a set of audio, **, **browsing, e-books, radio equal to the body of the multi-functional **device.

2. The audio format is the ** format. Audio format refers to the process of converting audio files to digital and analog in the computer. The maximum bandwidth of the audio format is 20000Hz, the rate is between 40 and 50kHz, and the PCM is modulated by linear pulse code, and each quantization step has an equal length.

The standard CD format is the sampling frequency, which is 88k seconds and has 16 digits of quantization. CD discs can be played in a CD player**, or they can be played back with a variety of ** software in the computer. A CD audio file is a *

CDA file, this is just an index information, not really contains sound information, so regardless of the length of the CD**, you will see "*CDA files" are all 44 bytes long.

It is also known as MPEG-4 format, which is mainly used in calls, voice sending, TV broadcasting and other fields. The MP4 format has reusability, strong interactivity, ultra-high compression efficiency, and can maintain very good results at low bitrates, which can make audio and ** more convenient integration.

MP4 is jointly developed by the International Organization for Standardization and the International Electrotechnical Commission, which is a standard for audio and compression. The MPEG-4 stream mainly includes the basic stream and the system stream, and the basic stream includes the encoded stream representation of the audio ** and the scene description, and each basic stream contains only one data type and is decoded by its own decoder. The system flow specifies the method of generating the interaction mode based on the encoded audiovisual information and the relevant scene description information, and describes its interactive communication system.

Features of MP4:

Different coding algorithms can be used for different objects, so as to further improve the compression efficiency. The objects are relatively independent, which improves the reusability of multiple ** data; Allows users to manipulate individual objects, providing unprecedented interactivity; It allows flexible allocation of bitrate between different objects, and can allocate more bytes to important objects and fewer bytes to minor objects, so as to obtain better results under the low bitrate. It is easy to integrate natural and synthesized objects.

MP4 is a very compatible format, and almost all devices support the MP4 format. MP4 has incomparable advantages, such as perfect reproduction of stereo sound, multi-** control, noise reduction and other new features, and most importantly, digital copyright protection through special technology.