What is the format of mp4 20

MP4 is a set of compression coding standards for audio and information, developed by the Moving Picture Experts Group under the International Organization for Standardization and the International Electrotechnical Commission, also known as MPEG-4 format. The MP4 format is mainly used for online streaming, CD-ROMs, voice transmission, and television broadcasting. MP4 allows flexible bitrate allocation between different objects, with more bytes allocated to important objects and fewer bytes allocated to minor objects, so as to achieve better results at low bitrates.

Audio MP4 format: AAC

MP4 was originally an audio format, which didn't have much to do with MPEG-4, just like *** has nothing to do with MPEG-3. is an abbreviation for MPEG-1 Audio Layer 3; And MP4 is MPEG-2 AAC, which is completely an audio compression format, adding new features such as perfect reproduction of stereo sound, multi-** control, noise reduction, and most importantly, MP4 achieves digital copyright protection through special technology, which is incomparable.

Now most of the MP4 on the market is biased towards multi-**** devices, and it can be said that there are very few of them. There are even ** who say that MP4 is the abbreviation of MPEG4, which seemed to be a fallacy before, but after the continuous hype of the business, this fallacy has become the truth. Now if you go to the computer city and hear the word mp4, it is definitely the concept of multi-**** device that can **** format, not a walkman that can ** audio mp4 aac.

This strange phenomenon is not without reason, it has been mentioned above that AAC has a copyright protection function, which is also the reason why many record companies support AAC, to make their own ** device support AAC, but also to support the payment of a certain copyright fee or patent fee, in addition, AAC's ** is also a problem, not as open as ***, very few on the Internet, so the current development of audio MP4** device is not mature, in view of the above situation, the merchants simply "borrow the corpse to return the soul", The mp4 is equivalent to the mpeg-4 abbreviation, which also happens to respond to the law that mp4 is the next generation of the first generation, in addition to supporting the **** function that the *** has, it also has a strong mpeg-4 **** ability, in addition, it happens to be "4" after "3", from this point of view, it is reasonable to equate mpeg-4.

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.

Summary. Hello dear, I'm glad to answer your questions MP4 is a common format, which is a format in the MPEG-4 Part 14 standard, developed by the International Organization for Standardization and the Operational ** Imaging Expert Group, and only contains. mp4 in one format.

MP4 can store and still images and subtitles, and is mainly used to store and stream with subtitles, mainly in portable and streaming services. MPP4 is a special extension, MPEG is the umbrella audio format.

What is the mp4 format.

Hello dear, I'm glad to answer your questions MP4 is a common format, which is a format in the MPEG-4 Part 14 standard, developed by the International Organization for Standardization and the Operational ** Imaging Expert Group, and only contains. mp4 in one format. MP4 can store and still images and subtitles, and is mainly used to store and stream with subtitles, mainly in portable and streaming services.

MP4 is a set of compression and coding standards for audio and information, developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) under the "Moving Picture Experts Group" (MPEG), the first version was adopted in October 1998, and the second version was adopted in December 1999.

MPEG-4 includes most of the features of MPEG-1 and MPEG-2 and the benefits of other formats, with the addition and expansion of support for Virtual Reality Modeling Language (VRML), object-oriented synthesis files (including audio, video, and VRML objects), and Digital Rights Management (DRM) and its roll-through interactive features.

One of the more advanced features of MPEG-4 than MPEG-2 is that it no longer uses macro blocks for image analysis, but records the changes of individuals on the image, so even if the image changes quickly and the bitrate is insufficient, there will be no block images.

MP4 applications

Since MPEG-4 is an open platform, companies and organizations can develop different formats according to the MPEG-4 standard, so there are many video formats based on MPEG-4 technology in the market, such as WMV 9, Quick Time, DIVX, XVID, etc.

Most of the features of MPEG-4 are left to the developer's decision. This means that the functionality of the entire format may not be fully encompassed by a particular program. As such, this format has so-called profiles and levels, which define the set of features that MPEG-4 can use for different platforms.