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How much does the bit rate affect the sound quality in an mp3? Part 2

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How much does the bit rate affect the sound quality in an mp3? Part 2

Is the bit rate very important?

We had already explained in a previous article that the bitrate expresses the amount of bits or information that an audio file can carry.

We gave an example, using ONE word to describe an object, then 2 words, then 10 words, etc. and we saw how that amount of information is crucial to be able to give detail that will increase quality.

We will now explain the two most important modes used to determine which bitrate a file will use.

CBR

This case is when the bitrate of an mp3 is constant, regardless of the content it contains.
Imagine that we put the highest butrate which is 320 and the file contains only silence.
It will still stay at 320 even if it doesn’t have any data.

We know that this example is extreme, but we want to illustrate the idea that the bitrate will be the same all the time, even when there are notable differences in the amount and complexity of the information.

VBR

Instead we have this other option that will try to regulate or adapt the bitrate precisely depending on the information.
If there is an initial silence, use the lowest bitrate, if there are moments of great complexity, use the highest.

Let’s think and be aware that the bitrate directly affects the size of the mp3.

So with VBR we have intelligent savings, keeping a low bitrate at times when it would be wasteful to use a higher one and increase the bitrate when the information demand requires it.

Mp4aGain is an application that manages all these options very well so that you can obtain the best results. Because we know exactly what we are talking about.

Is the bit rate very important?

We had already explained in a previous article that the bitrate expresses the amount of bits or information that an audio file can carry.

We gave an example, using ONE word to describe an object, then 2 words, then 10 words, etc. and we saw how that amount of information is crucial to be able to give detail that will increase quality.

We will now explain the two most important modes used to determine which bitrate a file will use.

CBR

VBR

Let’s think and be aware that the bitrate directly affects the size of the mp3.

So with VBR we have intelligent savings, keeping a low bitrate at times when it would be wasteful to use a higher one and increase the bitrate when the information demand requires it.

Mp4aGain is an application that manages all these options very well so that you can obtain the best results. Because we know exactly what we are talking about.

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How much does the bit rate affect the sound quality in an mp3?

Is the bit rate very important?

The bit rate strictly measures the amount of information per second that an audio file can carry.
What does this mean?

That the greater the number of bits per second, the greater the “detail” and the greater the number of details, the higher the resolution and therefore the quality.

Let us imagine an example that would illustrate the matter very clearly:

You must describe an object, but you can only use ONE word.

You say:

-Car

That doesn’t say much.

Now you can use 2 words:

1.- car 2.- red

We already have more information.

Now you can use 6 words:

1.- car 2.- new 3.- red 4.- convertible 5.- sports car 6.- luxury

Now you have a much more elaborate image, thanks to the fact that you were able to provide more information. If you could now use 20 words or 100, it would be a more precise idea each time that you could convey.

Exactly the same thing happens with music and the bit rate is the amount of information that can be transmitted per second.

An estimate like the following is generally known:

8 Kbps Mono: Telephone Sound.
16 Kbps Mono: Better quality than shortwave.
32 Kbps Mono: Better quality than AM.
64 Kbps Stereo: Better quality than FM.
112 – 128 Kbps: Quality close to CD.
160 Kbps: Quality closer to CD.
192 Kbps: Practically CD quality.
256 Kbps: CD quality virtually indistinguishable from an original CD.
320 Kbps: CD quality.

Mp4Gain can help you make your entire music collection the same bitrate.

In a following article we will give more information about this interesting topic. Very necessary if you want to really have quality in your audio and more if you use Mp4Gain.

How and why is the audio compressed to an mp3?

What is the use of converting to mp3?

As we have already been explaining, this entire topic is based on and one can only speak of “quality” if one refers specifically to the human ear.

We humans do not consider better quality the ability to record frequencies that we cannot even hear, neither because they are very high frequencies nor very low frequencies.

Nor do we consider a recording of poor quality that has not been able to record these frequencies.

Some animals would possibly have a different opinion.

So, having this point clear, we have to consider high fidelity to a recording that could faithfully record those frequencies that we humans can hear. The rest does not interest us.

So, all this first issue of encoding or compressing is based on that, on ensuring that the frequencies that the human ear can perceive remain with the greatest fidelity.

And we benefit from knowing that there are other inaudible frequencies, but they take up disk space and we can remove them without experiencing a drop in quality.

Mp4Gain is a program that handles these areas very well and manages to make it sound as good as possible and nobody will notice the difference between one format and another, because they all sound of the best possible quality.

Audio compression

Well, in fact, the bit rate should be said to be another dimension, it is a compression of audio files.

Nowadays, most of the audio formats that we use regularly are based on the original “WAV” file of the audio CD (44.1khz sampling rate, 16bit sampling precision, 2ch). The original recorded sound data is stored in an array, which is in PCM format, while WAV format is an encoding format developed by Microsoft, and its function is to play the PCM format data through encoding.

Since the data in WAV basically completely restores the PCM data, MP3, AAC and other lossless encoding formats are basically recompressed based on the WAV files. Therefore, we can simply think that WAV is the original audio format and other audio formats are compressed formats.

When it comes to compression, storage and transmission are inseparable. The purpose of compression is to improve storage and transmission. Therefore, before we talk about compression, we need to understand the basic units of computers.

We all know that the computer is a binary number system, and the files stored by the computer are made up of two numbers, 0 and 1. Therefore, the computer’s transmission is based on each number, and each number is called 1 ” bit”. For example, for an audio piece, its basic data is “0,1,1,1,0,1, 1 ,0″, and when transmitting, these numbers are transmitted one by one. The sampling precision mentioned above is this unit.

The storage unit of the computer is ” byte (Byte)”. In the computer, 1 byte consists of 8 bits, that is, 8b(bit)=1B(Byte). In computer parlance, data storage is expressed in decimal and data transmission is expressed in binary, so 1KB=1024B=1024×8b. This is also part of the reason why the hard drive capacity we see does not match the actual capacity.

Go back and talk about audio compression, the bitrate of the audio is actually the compression ratio. So the bitrate really just defines the size of the file, but because under normal conditions the larger the file, the less data you lose, so the sound quality is relatively higher. However, the bit rate itself does not directly affect the quality of the file. For example, if we take a 128kb file as the source file, even if it is converted to a 320kb file, the sound quality will not be better than 128kb. .

So what exactly do the numbers and letters in the bitrate mean? First look at the full name of 128k “128kbps”, let’s try to break it down: 128 is a number, k is a thousand symbol, b is a unit, s is a second, and ps is actually “/s”. Thus, 128kbps is 128kb/s. That’s 128kb per second.

Note that the b here is a lowercase b, or bit. Knowing this, we can calculate the approximate storage space that a 128kb file occupies: 128*1000=128000b/s÷8=16000B/s÷1024=15.625KB/s*60=937.5KB/min÷1024=0.9155 MB/ min. So 128Kb audio file size is about 0.92M or 916Kb per minute, so 128Kb mp3 is about 1M in size. You can test and check it locally.

Before talking about lossy and lossless, there are two words to explain to you, that is, we will see CBR and VBR when compressing MP3. And CBR is constant bit rate, constant bit rate; VBR is variable bit rate, dynamic bit rate. In theory, VBR’s way is to automatically correct some bitrates according to the specific frequency of the sound in the source audio file, to achieve a smaller file with the same bitrate effect.

Let’s talk about lossy and lossless. In a nutshell, lossy compression is about achieving compression by removing some less important data from existing data; lossless compression is about achieving compression by optimizing the layout. Since these compression methods involve deeper technical knowledge, we won’t say more, and we can probably look at it this way: lossy compression is like removing some unimportant particles in an article to achieve the purpose, after decompression, it is you deleted the content cannot be recovered; Lossless is achieved through typesetting. After decompression, complete WAV data can be obtained, just like our commonly used winzip and WinRAR.

What is the difference between 128k and 320k music?

【Preface】

Some time ago, a colleague came across a very troubled client. The mess was said to have been caused by the client asking him to provide song files larger than 100MB-200MB in size. And my colleagues don’t know much about audio formats, so they started endlessly fumbling about FLAC, WAV and audio size. In the end, the colleague did not clearly explain to the customer what was going on.

After that, other things happened that made me feel that in the music industry there are too many practitioners around me who have an extremely poor understanding of music and even lack some basic knowledge related to music. I don’t even have the idea to understand, which makes me very sad. It seems that music has only one product attribute, and our practitioners only need to organize the shelves, encode various products, and recommend products to users with the big data of user purchase records, and they don’t need to worry about why the users users like this. Brands, what features these products have, and provide users with various services with cold data.

Therefore, I think it is necessary to write something. I don’t expect practitioners to become people who really love music. I just hope that even if you still think of “her” as a commodity, you can first figure out what you’re selling. and what is..

PS: The contents of the first lesson are multimedia files. Since the relevant content involves a lot of technical issues, it seems a bit boring, but if you read it carefully, you will see that it is actually very easy to understand, but these basic knowledge can be very helpful.Improve your skill well. Also expect more interesting content about records, musical styles, etc. which I will post soon.

Bit Rate, Sample Rate, Lossless, MP3, FLAC, APE, 320kb, 192kb, 128kb, 44.1khz, CBR, VBR. Does this bunch of various names make you both familiar and unknown?

The higher the bitrate, the better the sound quality. Lossless music is the highest sound quality, right? So, let’s start with the sound collection.

【Audio composition】

Nowadays, when we talk about audio, everything is digital audio. Digital audio consists of three parts: sample rate, sample precision, and number of sound channels.

Sample Rate: Both the sample rate, which refers to the number of samples per second when recording the sound, expressed in Hertz (Hz).

Sampling Precision: Refers to the dynamic range of the recorded sound, measured in bits (Bit).

Sound channel: the number of channels (1-8).

In simple terms, we can think of a sound wave as a curve. We know that the curve is made up of points, and the sampling rate is the number of points in the middle of the length per second (the horizontal axis in the figure above). Sampling precision is the number of points in the dynamic range (upper vertical axis). The finer the positioning of these two dimensions, the greater the true sound restoration and the better the sound quality. Of course, the larger the audio file will be.

What is the proper audio bitrate? Part 2

What does audio bitrate mean?

Are higher audio bitrates better?

Encoding rate (Kbps) * total length of the song (seconds) / 8 = file size (KB), if divided by 1024, it is the size in MB.
mp3 is lossy compression, the smaller the file, the higher the loss. The relationship between bitrate and audio and video compression is simply that the higher the bitrate, the better the audio quality and video, but larger is the encoded file; yes The opposite is true for lower bitrates.
Bitrate refers to the sampling rate at which digital sound is converted from analog to digital format. The higher the sampling rate, the better the quality of the restored sound.
The bitrate value is compared to the actual audio:
16 Kbps = phone sound quality
24 Kbps = increase phone sound quality, short wave transmission, long wave transmission, European standard medium wave transmission
40 Kbps = American standard medium wave transmission 56 Kbps
= voice
64 Kbps = voice boost (best bit for mobile phone ringtones) = tape (best setting for mobile phone stereo MP3 player, best setting for low-end MP3 player
112 Kbps = FM stereo radio FM 128 Kbps ) 160 Kbps = Hi-fi HIFI (best setting for mid-range MP3 player to high-end MP3 players) 192 Kbps=CD (best setting for high-end MP3 player) high-end ) 256 Kbps= Studio Music Studio (for music enthusiasts) In fact, with the advancement of technology, bit rates are also getting higher and higher, MP3 has a maximum bit rate of 320 Kbps, but some formats can achieve higher bit rates and superior sound quality. For example, the emerging APE audio format can provide true audiophile-level lossless sound quality and smaller volume than WAV format, and its bit rate is typically 550kbps.

What is the proper audio bitrate?

What does audio bitrate mean?

What is the proper audio bitrate? When recording gameplay videos and putting them on the Internet, the bit rate used to suppress the video depends on the end use. If you are going to share it on an online video site like Youku, the requirements for videos will vary from site to site. Youku’s requirements for video formats are as follows: Generally speaking, when uploading videos to online sites, it is recommended that the video be encoded in H264/X264, and the video bitrate should be 1600Kbps;
What is the proper audio bitrate?

When recording gameplay videos and putting them on the Internet, the bit rate used to suppress the video depends on the end use.

If you are going to share it on an online video site like Youku, the requirements for videos will vary from site to site. Youku’s requirements for video formats are as follows:

Generally speaking, when uploading to online video website, it is recommended that the video be encoded by H264/X264, the video bit rate should be 1600Kbps; audio must be AAC encoded and audio bitrate must be 128 Kbps.

If you plan to put it on the network drive and share it with friends, it is recommended to use a higher bit rate. For example, the video is encoded by H264/X264 and the video bit rate is 2400Kbps; the audio is AAC encoded and the audio bitrate is 128 Kbps.

What does audio bitrate mean?

The code rate is the number of data bits transmitted per unit of time during data transmission. Generally, the unit we use is kbps, that is, kilobits per second.
A common understanding is the sample rate. The higher the sample rate per time unit, the higher the precision, and the processed file will be closer to the original file, but the file size is proportional to the sample rate, so almost all encoding formats pay attention to This is how to use the lowest code rate to achieve the least distortion. The cbr (fixed code rate) and vbr (variable code rate) derived from this core are all items in this regard, but things are not absolute, In terms of audio, the higher the bit rate, the lower the compressed ratio, the smaller the sound quality loss and the closer it is to the sound quality of the audio source.
Basically, the sound quality of the two data 44.1 and 128 in the MP3 song attribute is very good.

What does the quality of the audio or video depend on?

What factors are crucial for a higher or lower quality in digital files?

Files like WAV are not compressed, but they take up a lot of space and contain a lot of inaudible and unnecessary information.

This forced them to look for ways to be able to compress this audio or video to save space and so that they were also lighter to watch or listen to live on sites like YouTube or Spotify, etc.

Let’s see what are the important parameters:

1.- Bit Rate

It is the bit transfer rate. Said in an easy to understand way, it is the amount of information that can be transmitted per second. It is obvious that the more information that can be transmitted, the greater the detail and therefore the greater the quality.

Sometimes the transfer rate is fixed (CBR) but it can also be variable. Where the bitrate chosen for each moment will depend on the amount of information needed.

An audio with a lot of silence and few sounds will need to transfer much less information per second than an audio full of sounds and nuances.

2.- Sampling rate

The amount of information per second that is sampled will mark the number of details that are captured and can be transmitted.

But obviously also the higher the sampling rate, the greater the information contained.

Therefore, we see as a very simplified summary that a higher quality requires greater detail and therefore better information stored and a higher speed of transmission of that information.

Therefore higher bitrate and higher samplerate will usually mean higher quality, and will also take up more space.

Which is better, MP3, FLAC or WAV? Part 2

The right audio file format can do more with less

M4A

M4A is a format compatible with Apple products such as iPhone and iPod, and corresponds to MPEG-4 video files. M4A files have lossless compression and can be edited multiple times without quality loss. Compared to other audio file formats, M4A has similar quality but smaller file size.

CCA

Like MP3, Advanced Audio Coding (AAC) files are also lossy formats. However, AAC files are of much higher quality in their original state than all other audio file formats, and AAC files are generally similar in size to MP3, but slightly higher in quality.

In addition, AAC also offers variable bitrate or constant bitrate encoding, and AAC files are also open source, which means you don’t have to pay royalties to create and share them (unlike MP3 files). .

AAC files are usually used in iTunes, but can also be used in other player devices and game consoles.

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OGA

Like AAC, OGA files are open source and use lossy compression. They use a variable bit rate to reduce file size without reducing the overall sound quality. In practice, OGA files tend to be of higher quality than MP3s, but many programs don’t support OGA.

FLAC

Like M4A, FLAC is a lossless format, but unlike M4A, FLAC is an open source encoding and has a more efficient compression algorithm that reduces the file to 50% to 70% of its original size. This format is popular with audiophiles as a way to collect music in its highest quality form. Because it is open source, it is compatible with many devices and programs.

PCM, WAV and AIFF

PCM (Pulse-Code Modulation) is an uncompressed audio file format commonly used on CDs and DVDs. This format uses a “sample rate” and a “bit depth”, where the sample rate represents the sample rate of the original audio file and the bit depth represents how many bits are used to define each sample.

WAV (Waveform Audio File Format) is generally used as a format for storing PCM audio files, which makes it more suitable for Windows computers.

AIFF (Audio Interchange File Format, Audio Interchange File Format) like WAV is commonly used to store audio files in PCM format (except Mac).

How to choose the correct audio file format

Choosing the right format completely depends on the audio file you intend to use, you should choose a format that expresses the sound quality of the desired audio file, unnecessary high quality audio files can be difficult to move, share, convert and manage . Consider the following two cases:

If you plan to edit audio files (such as podcasts), use uncompressed formats (including PCM, WAV, and AIFF) so that the quality of the audio files is maintained each time you edit and save the file. Once completed, it can be generated in a compressed format that is easy to share.
If you are an audiophile and want to listen to your music in high fidelity, choose a lossless compressed file format, including FLAC, WMA, M4A. It uses less storage space than uncompressed formats, but still retains the original full file quality.
If you don’t care about the quality of audio files, want to share files on the Internet, or need to save hard disk space, choose a format that uses lossy audio file compression, including MP3, OGA, AAC. Fortunately, lossy compression has gotten so good in recent years that most people can’t tell the difference between lossy and lossless compression.
In conclusion

In summary, the most popular types of audio files are:

MP3
M4A
CAA
OGA
FLAC
WAV
PCM
AIFF
In some cases it is better to use one file format than the other, in which case you should convert between the two file formats. To programmatically convert between audio or video file types, you can use Filestack’s Audio Transcoding API or Video Transcoding API. The Filestack API also supports splitting audio files from video files, cropping or resizing video files, video file thumbnails, and more.

Which is better, MP3, FLAC or WAV?

The right audio file format can do more with less

Starting with MP3, M4A, and AAC, etc., when you process audio or video in your program, you will find many audio file formats. In this article, we’ll take an in-depth look at the different types of formats and when to use them in an audio or video file.

First, let’s answer some frequently asked questions:

What is the best audio format for sound quality?

Lossless formats like FLAC, WAV and AIFF are the best formats for audio files, these types of audio files are considered “high resolution” because the quality is better than a CD, but these files take up a lot of space.

Which audio file format is best to use on the web?

From a browser compatibility point of view, MP3 and MP4 are the most suitable formats to use on web pages. Modern browsers, including IE9, support this format, and some also support other formats, such as OGG, WebM, AAC, and WAV.

What are the most popular audio formats?

MP3 files are the most widely used format, and the popularity of MP3 in recent decades has led to the rise of many MP3-compatible players on the market, which continues to this day. MP3 offers a variety of different bit rates to balance quality and file size, and efficient size makes it a standard format for exchanging audio files over the Internet.

How to convert audio files from one format to another?

To convert formats manually, use a program like VLC Media Player to convert between popular audio file formats.

To programmatically convert files, Filestack provides an audio file transcoding API that makes converting audio files easy and convenient.

audio file format

MP3

MP3 is the most common audio file format and has lossy compression, which means that its quality will decrease with further editing. But compared to other audio file formats, the file size of MP3 is still relatively large.

MP3 files can be encoded at a constant or variable bit rate. Constant bit rate ensures the same quality throughout the audio file, but results in a larger file; Reduces quality when near silent, which reduces overall file size. Most smartphones and music players use the MP3 format.