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MP3 file format

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MP3 file format

Mp3 file format

Introduction:
MP3 file format

1. Overview:
MP3 files are made up of frames, and frames are the smallest unit of MP3 files. The full name of MP3 must be MPEG1 Layer 3 audio files. MPEG
(Motion Picture Experts Group) translates into Chinese as Moving Picture Experts Group, and refers specifically to moving video and audio compression standards.
MPEG1 standard, also known as MPEG audio layer, which is divided into three layers based on compression quality and encoding complexity, namely,
Layer-1, Layer2 and Layer3, which correspond to the three sound files of MP1, MP2 and MP3 respectively, and use different
levels of audio files according to different purposes. The higher the MPEG audio encoding level, the more complex the encoder and the higher the compression ratio. The compression ratios of MP1 and MP2 are 4:1 and
6:1-8:1 respectively, while the compression ratio of MP3 is as high as 10:1-8:1. 12:1, meaning one minute of CD-quality music requires 10MB
of storage space without compression, but only about 1 MB after MP3 compression encoding. However, MP3 uses a lossy compression method for audio signals. To reduce
sound distortion, MP3 adopts “sensory coding technology”, that is, it first analyzes the frequency spectrum of audio files during encoding, and then uses filters to filter the
noise . levels. Then the remaining bits are spread and arranged by means of quantization, and finally an MP3 file with a higher compression ratio is formed, and the
compressed file can achieve a sound effect closer to the original sound source during playback.
2. The whole structure of
MP3 files: MP3 files are roughly divided into three parts: TAG_V2 (ID3V2), Frame, TAG_V1 (ID3V1)
ID3V2 contains information like author, composer, album, etc. The length is not fixed, which expands the information volume of ID3V1.
A series of frames, the number is determined by the size of the file and the length of the frame. The length of each frame of the
frame
may not be fixed or fixed, and is determined by the bitrate
.
Each table is divided into two parts: table header and data entity Header of data.
frame
Record the bit rate, sample rate, version and other information of mp3, and each frame is independent of each other The frame
ID3V1 contains information like author, composer, album, etc., and the length is 128BYTE . 3. MP3 FRAME format: each FRAME has a FRAMEHEADER frame header, the length is 4BYTE (32 bits), there may be two CRC check bytes after the frame header, the existence of these two bytes depends on the FRAMEHEADER information If bit 16 is 0, there is no checksum after the frame header, and if it is 1, there is a checksum. The checksum length is 2 bytes, followed by the FRAMEHEADER, followed by the frame entity data. The format is as follows: FRAMEHEADER CRC (free) MAIN_DATA 4 BYTE 0 OR 2 BYTE The length is calculated from frame header 1. The format of the FRAMEHEADER frame header is as follows: AAAAAAAA AAABCCD EEEEFFGH IIJJKLMM

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What are the advantages and disadvantages of the mp3 format? Part 2

mp3 advantages

Now that MP3 is so popular, you must have thought like me, if there is MPEG Audio Layer-2 or MPEG Audio Layer-1, yes, they exist, and many of us are already using it, but we don’t know it.

MP3 ADVANTAGES

For example, the VCD that we often see is recorded and stored in the MPEG-1 compression method.
Well, first of all, the bottom part is the size of the Wave data, in order, it’s MPEG-1, MPEG-2, MPEG-3. Why do we take the Wave data as a reference for our comparison? Because Wave data is an uncompressed music file format, its only advantage is that it is not distorted, so from the image above we can clearly see that MP3 is indeed the most powerful in compression, which can reach 1: The ratio of 10 ~1:12, so we can fit dozens of songs in a small memory. You may be wondering, how is this done?
The principle is very simple. The first is advanced encryption technology, which re-encrypts and compresses all data, and the second is to use data reduction. For example, our human ears aren’t very sensitive to sounds over 15 KHz, so smart scientists thought, since I can’t hear it, why do I record it? So I removed some data to make it smaller, so even if all the data is distorted, we can’t feel it. Sound data in MP3 format is a type of sound wave data. It is a file format that compresses the original sound wave data in MP3. After this special method, a Wave file of almost 50-60 MB can be converted into a file. You need more than 4 MB of files, and the sound quality is almost the same as the original, saving almost ten times the storage space, so an MP3 music CD can contain more than a dozen music CDs and an album of music CDs can play for 60 minutes To calculate, an MP3 music CD can play almost ten hours of music, just like a small music collection cabinet. Well, having said so much, MP3 is good, but because MP3 uses a compressed format, there is some loss in sound quality. However, the lower the compression ratio, the better the effect.

What are the advantages and disadvantages of the mp3 format?

MP3 ADVANTAGES

Advantages of the MP3 format:

mp3 advantages

1. Due to its small file size and good sound quality, this format’s status as a mainstream audio format is still hard to shake.
2. There are various sample rates for compressed music in MP3 format. You can use a sample rate of 64 Kbps or less to save space, or use the standard 320 Kbps for extremely high sound quality.
3. Compared with other audio format files, MP3 format audio files occupy less storage capacity.
Disadvantages of the MP3 format:

1. Compression of audio files in MP3 format is lossy compression.

2. The MP3 format audio encoding has a high compression ratio of 10:1~12:1, while basically keeping the low audio part undistorted, but sacrificing the quality of the 12KHz high audio part to 16 KHz in the sound file.

3. MP3 files may not play on some players. Because the default CBR (Fixed Sample Rate) technology can sample a song at a fixed rate, and VBR (Variable Sample Rate) can increase the sample rate for higher sound quality when the music is “busy” . The resulting MP3 files may not play on some players.

The fashion of digital music on the net is caused by MP3. As an audiovisual lover, do you know the MP3? MP3 is short for MPEG 1 Layer 3, which is said to be a computer file format derived from a German study investigating how to extract audio tracks from CDs. MP3 itself is a compression and decompression calculation method used to process high ratio sound information. The sound files it generates are close to CD quality, but only one twelfth the file size. Therefore, a CD-ROM can only store between 12 and 20 audio tracks in CD format; if it is stored in MP3 format, it can store around 100 tracks. This is its charm: it can be downloaded almost free from the Internet, the sound quality is good and the file size is small. Now it has become so popular that it seriously threatens the traditional singing market.

MP3 history

It all starts in the 70s, in Germany, when a German teacher and his students think of a way to encode music. Dieter Seitzer’s team at the University of Nuremberg manages to develop the first processor capable of compressing audio.

In the 1980s, an agreement was signed between the German university and the Fraunhofer Institute. With more people, the group begins to try to improve the audio encoding algorithms. At the end of the decade, the student Karlheinz Brandenburg presented the OCF algorithm (“Optimal coding in the frequency domain”) in his doctoral thesis.

In 1991, the OCF algorithm was refined and adopted by the MPEG group. MP3 was born, but still without the name we know today.

Only in 1995 was the name MP3 suggested, voted and unanimously approved. Files encoded in MPEG-1 Layer 3 must have the extension “.mp3”. Until now, the codec was only handled by its developers.

At the time, no one knew how successful the format would be, as everyone was excited about the LP, K7, and CD compilation.

But MP3 began to spread like a tsunami through MP3 players, sharing recordable CDs with Internet users and later with recordable DVDs, flash drives, smartphones, and external hard drives.

With the increase in Internet speed and the size of the storage capacity of devices, millions of people can download complete albums in seconds and save them in different places.

Advantages and disadvantages of MP3

ADVANTAGES :

The listener can equalize, increase / decrease the volume, pause / stop and fast forward / rewind the MP3 as if they were listening to a CD.
It requires little RAM to function.
Due to its small size, it can be transported, shared, stored and run in different ways and on different devices.
You can download thousands of songs on the Internet, both free and paid.
It has superior quality to an old radio or K7 transmission.
On the Internet, obtaining it is immediate, unlike physical means, which can wait days to arrive.
It is possible to make a playlist with hundreds of songs and play them without having to change the media / media.
Harms less the environment.
Improvements are possible through audio editing software.
It has metadata with information about artist, album, genre, etc.

DISADVANTAGES:

Conversion may result in low quality, depending on the quality chosen.
An MP3 downloaded from the Internet may have some effects, voices and other changes made to the original audio.
Facilitates piracy, both virtual and physical, damaging copyright.
It has a loss of quality, although minimal, in relation to the CD.
It is intangible, it cannot be touched or smelled.
There is no sense of nostalgia.
Some MP3s have incorrect or missing metadata about the song.