What exactly is MP4? Just as people refer to the MP3 player as MP3, the MP4 portable video player is also referred to as MP4. Of course, just as MP3 is not MPEG3, MP4 is not MPEG4. The names they use are not directly related to their underlying technology applications. The concept of MP4 has actually been extended by vendors.
Mp4 is a file format, and mpeg4 is a coding standard. They are not a concept in meaning. You can understand that mp4 is a standard audio and video file that supports mpeg4, and there are many file formats that support the mpeg4 standard. Both mp4 and avi are one of them. Online should be able to find a lot of software to achieve the conversion between mp4, wmv, mpg, avi, rbmv and other video files.
The MP4 concept has nothing to do with two concepts. One refers to the music format following MP3. From a technical perspective, MP4 uses MPEG-2 AAC technology, also known as A2B or AAC. It is characterized by a better sound quality and a larger compression ratio (15:1-20:1). It adds features such as perfect reproduction of stereo, bitstream effect sound scanning, multimedia control, noise reduction, etc., which makes the CD sound quality perfect after audio compression.
The other is a portable player that supports the video format MPEG-4. Let's first look at what is MP4. MP4 (also known as MPEG-4) is a type of MPEG format that is a compression method for moving images. With this compression, smaller files can be used to provide higher image quality, which is one of the most popular (especially in the network) video file formats. The advantage of this format is that it can not only cover the low frequency band but also the high frequency band. MP4 has attracted widespread attention since its inception. Currently, the most popular compression methods for MP4 are DivX and XviD. After the DVD program processed by MP4 technology represented by DivX or XviD, the video and audio quality of the image is not greatly reduced, but the volume is reduced to a fraction of the original, and it is convenient to use two ordinary CDs of 650MB capacity. -ROM to save the generated file. With a single disc, you can hold a movie for a hundred minutes, and the picture quality is significantly better than VCD.
MP4, hard to say, it is just a compression standard, just like VCD is based on MP2,
MP3 seems to only compress audio, MP4 audio, video can be compressed, usually on the computer
What plug-ins (DIVX, FFDSHOW) are required to watch movies,
It is compressed with MP4.
Most of the current MP4s are biased towards multimedia players, and it is very rare to play AAC. Even the media said that MP4 is an abbreviation of MPEG4, which seems to be a paradox in the past, but after the constant hype of the business, this paradox has become the truth. Now if you go to Computer City and hear the word MP4, it is definitely a concept of a multimedia player that can play video formats, rather than a Walkman that can play audio MP4 AAC. There is no reason for this strange phenomenon. As mentioned above, AAC has copyright protection function. This is why many record companies support AAC. To support AAC in their own players, they have to support certain copyright fees or patents. Fees, in addition, the source of AAC is also a problem, not as open as MP3, there are very few online sources, so the current development of audio MP4 players is not mature, in view of the above situation, the merchants simply "return the corpse", MP4 is equivalent to MPEG-4 Abbreviation, this also happens to be the MP4 is the next generation of MP3 this law, in addition to support MP3's music playback capabilities, but also has a powerful MPEG-4 video playback capabilities, in addition, just "4" in "3 After that, from this point, it is reasonable to equate MP4 with MPEG-4.
　
The difference between the two is that MPEG4 is a series of encoded names, and MP4 is a file name suffix.
MP4 is a package format that includes different video encoding and audio encoding combinations. Therefore, there is a compatibility problem. If an MP4 file cannot be played on your playback device, you can use the format factory for format conversion, select compatible video encoding, screen size (resolution), bit rate (code rate), and convert. After that, you can usually play it.
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