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Digital video: What is bitrate?

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Digital video: What is bitrate?

Bitrate

As we have been mentioning, the bitrate refers to the amount of information when reproducing a video file that our computer is able to read for every second.

Bit Rate

For this reason, in the same way that it happens with the image size, the greater the data flow, the higher the quality of the material.

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The bitrate can even be more decisive than the size of the image to define its quality, since when viewing a video that has a large size but at the same time its data flow is scarce, we will be facing a material of very poor quality.

In this sense, we can cite as an example the DVD of 720 x 576 resolution and approximately 8 Mb / s, in comparison with a Bluray of 3840 × 2160 and 50 Mb / s, where without any doubt the second example will give us a much higher image quality, but with a greater effort on the part of the computer to reproduce it.

Let us bear in mind that in the case cited for comparison, although in one of them the screen size is larger, the truth is that its bandwidth is scarce, since this data stores the information regarding luminance and color of the video. Therefore, when the data flow is poor, the computer must group a large number of pixels that contain the same information, generating redundancy that directly affects the quality of the video.

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As a side note, it is important to mention that we should not distinguish between KByte (KB) and Kbit (Kb), since every 8 bits we have one byte.

Conclution
As we could see in the article, the bitrate affects practically all the tasks that we undertake with our PC, tablet, smartphone or any other device, and we hope that it has been useful to understand a little better the wonderful world of the computing.

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Bit rate on the Internet

Bit rate on the Internet

Bitrate

In the case of the bit rate applicable to the Internet, the higher the bit rate is the better, since the content we receive from the network arrives faster. In other words, the higher the bitrate we get from our ISP, the better the connection will be and we will be able to work much more comfortably.

Bitrate

Higher bitrate on an internet connection means streaming movies and video in high definition, playing online games with no lag, and downloading really large files smoothly and in seconds.

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In the event that we want to know exactly what the bitrate of our connection is, we can do it easily and comfortably by accessing with our browser a site that is responsible for carrying out this test. One of the best on the market is speedtest.net.

Bit rate in audio and video
If we talk about audio and video, the meaning of the term bit rate differs a bit from what we use for the Internet. In this context, bit rate refers to the amount of data stored for every second of data that it reproduces. To take an example, an MP3 file of a song at 320 kbps offers a much higher quality than the same file encoded at 128 kbps, obviously as long as both files were created from the same source.

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But we must always remember that if the source from which we obtained the files was of poor quality, then the copy will also be of poor quality, whether it has been encoded at 128 kbps or 320 kbps.

This is also the case with videos, a much higher bit rate will offer a much better display quality than video with the same resolution but at a lower bit rate.

The bit rate could be expected to increase each time the resolution increases as more data is being processed. This means that while high bitrate rates can deliver excellent display quality, they also require significantly more processing effort on the part of the hardware, forcing it, especially on modest and older hardware, to produce pauses and clipping.

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Another aspect that we must also take into account since it is very important is that video file formats use different sets of compression algorithms, which could also be able to offer high quality with a more discreet bit rate. However, the extra processing load for these types of videos can also complicate the processor and systems involved in decoding.

Transfer bit rate on hard drives and SSD drives
Although most users do not pay attention to this parameter when talking about hard drives or SSDs, the truth is that it is one of the most important factors, more important even than its storage capacity or its rotation speed.

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The bit rate in this context determines the reading and writing speed of these storage devices, the most delicate parameter to take into account, since this affects the performance that we will obtain from it. If we have a low transfer rate, it will slow down all the storage and reading processes, which will affect the times used to save large files and the overall performance of applications and games.

What is Bitrate? Bitrate of video, audio, internet and more …

What is Bitrate? Bitrate of video, audio, internet and more …

We have surely heard the word bitrate countless times when an expert user refers to some video or audio in digital format, and we have come to know that it is the element that defines the data flow. But what exactly is bitrate? The doubt arises because this parameter is not only used in these fields.

Bitrate

Like the resolution and the final format of the digital video or audio, another of the determining factors to obtain an excellent quality in an image or sound is, without a doubt, the bitrate, a parameter that perhaps is not always fully taken into account. And that not only applies to the field of audio or video. Therefore, in this article, we will find a lot of information to fully understand what bitrate is.

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Bitrate: Why it is so important in our digital life
Electronic devices have reached operating speeds that were unthinkable just a few years ago, and that is why today we expect our device, be it a smartphone or tablet, a computer or a hard drive, to respond to us instantly and without hesitation. Many and varied factors have to do with it, but one of the most important is the bit rate at which it can exchange or process information.

The term bit rate, used in computing and telecommunications systems, basically refers to the amount of bits that can be transmitted in a given unit of time through a transmission system or between two digital devices. Depending on the context in which the term is used, the bitrate, or bitrate in English, is measured in Kbit / s or Mbps, kilobits per second or megabits per second, respectively.

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Regardless of the unit of measurement used to define the bitrate, higher numbers always mean better and higher quality values, although we must not forget that low bitrate values can also mean less signal processing by the hardware, very convenient in equipment such as smartphones, tablets or netbooks.

How does the bit rate affect the quality of the music?

How does the bit rate affect the quality of the music?

Which indicator determines the bit rate of an audio file?

Bit Rate

There is a lot of talk these days that we have lost real music with the advent of compressed audio formats like MP3, AAC and the like. Is it really so? Will lossless music save music? Can an inexperienced listener tell the difference between MP3 and FLAC music? Let’s take a look at this problem.

What is Bitrate?
You’ve probably heard the term “bitrate” before, and you probably have a basic idea of what it means, but it might be a good idea to familiarize yourself with its official definition to find out how it all works.

Bit rate is the number of bits or the amount of data that is processed over a period of time. In audio, this generally means kilobits per second. For example, the music you buy from iTunes is 256 kilobytes per second, which means that every second of the song contains 256 kilobytes of data.

The higher the bit rate of the track, the more space it will take up on your computer. Audio CDs tend to take up quite a bit of space, so it has become common practice to compress these files so that you can burn more music to your hard drive (or iPod, Dropbox or whatever). This is where the “lossy” and “lossy” formats conflict.

Lossless and Lossy formats: what’s the difference?
When we say lossless, we mean that we haven’t really changed the original file. That is, we copy a track from the CD to our hard drive, but we do not compress it to the point of losing data. Essentially the same as the original CD track.

However, most of the time, you will probably extract your music in Lossy format. That is, you took a CD, copied it to your hard drive and compressed the tracks so they don’t take up much space. A typical MP3 or AAC album is probably about 100MB. The same album in a lossless format like FLAC or ALAC (aka Apple Lossless) will be around 300MB, so it has become common practice to use lossy formats for faster downloads and more hard drive savings. .

The problem is that when you compress a file to save space, you are removing chunks of data. Just like when you take a high-quality image and compress it to JPEG, your computer grabs the raw data and “tricks” certain parts of the image into being basically the same, but with some loss of clarity and quality.

Let’s take the following two images as an example: the one on the right is clearly compressed and the quality is reduced as a result.

Remember that you are saving hard drive space by compressing music in lossy formats, which can make a big difference for an iPhone with 32GB of storage, but is only a trade-off in terms of size / quality.

There are different levels of compression: 128 kbps, for example, takes up very little space, but it will also have lower playback quality than a larger 320 kbps file, which in turn is of lower quality than a 1,411 reference file kbps. 1,411 kbps is CD-level audio quality, which is more than sufficient in most cases.

The problem is not how much the music is compressed, but what equipment you listen to it on.

Does bit rate really matter?
As memory gets cheaper every year, listening to sound at a higher bit rate, or even lossless formats, is starting to become more and more popular. But is it worth the time, effort, and memory usage on your phone or computer?

I don’t like answering questions this way, but sadly the answer is: it depends.

Part of the equation is the hardware you use. If you are using a good quality pair of headphones or speakers, you are used to wide frequency and dynamic range. As such, you are more likely to notice the downsides that come with compressing music into lower bitrate files.

You may notice that low-quality MP3 files lack a certain level of detail; Subtle backing tracks may be harder to hear, the highs and lows will not be as dynamic, or you may hear distortion in the lead vocal.

What is the bit rate?

What is the bit rate?

Bitrate

Bit rate refers to the data transfer rate (that is, how many bits are transmitted in a given time), generally expressed in bits per second.

Bitrate

Common units of bit rate are kilobits per second (Kbps) and megabits per second (Mbps). The term is also commonly used when talking about digital sampling and sample rates. For example, the MP3 audio compression algorithm is often configured to output files at a bit rate of 128 kbps. This means that the file contains an average of 128 kilobits for every second of audio (960 KB per minute). This is in contrast to CD audio, which is encoded as 44,100 16-bit stereo samples per second: 1411.2 kbps (16-bit x 44100 Hz x 2ch).

Often times, bytes are written in uppercase and are multipliers (for example, “KB” for kilobytes) and lowercase factors are bits (for example, “kb” for kilobytes). All modern computers use 8-bit bytes.

MP3 bit rate
The MP3 bit rate can be misleading. For example, an MP3 “constant bit rate” (CBR) of 128 kbps will use approximately 128 kilobits for every second of encoded audio (so the file size in bits divided by the length of the audio is approximately 128,000) , and headers, your frames will appear at regular intervals, but internally, from frame to frame, you can encode audio at bit rates higher or lower than 128 kbps by using a bit bucket (the ability of a frame to use bits of replacement of a previous block). However, the size of this bucket, and therefore the amount of variability, is limited, so 128 kbps will be very close to the effective bit rate throughout the file.

See also: 8D surround sound and how to do it
As another example, “128 kbps VBR MP3” is often incorrect, since the purpose of VBR is to allow each of the internal MP3 sectors to have its own bit rate. When people refer to the VBR MP3 bit rate, they are generally referring to the actual average bit rate of their frames. If the length of the encoded audio is known, then the “bit rate” can be the data size of the file divided by its duration, which will be fairly close to the same number. However, the length of an MP3 VBR cannot be accurately determined without scanning all the frames.

Let us remind you that when mixing and mastering, our engineers encode mp3s with various algorithms, and choose the best result so that the client gets the highest acceptable quality from their composition.

The higher the bit rate, the better the track?

The higher the bit rate, the better the track?

bit rate

This is not always the case.

bit rate

For starters, let me remind you what bitrate t (bitrate, instead of bitraid). In fact, this is the data rate in kilobits per second during playback. That is, if we take the size of the track in kilobits and divide it by its duration in seconds, we get its bit rate, the call. File-based bitrate (FBR), usually not too different from the bitrate of the audio stream (the reason for the differences is the presence of metadata on the track: tags, “embedded” images, etc.) .

Now let’s take an example: the uncompressed PCM audio bit rate recorded on a normal audio CD is calculated as follows: 2 (channels) × 16 (bits per sample) × 44100 (samples per second) = 1411200 (bps ) = 1411.2 kbps. .. Now let’s take and compress the track with any lossless codec (“lossless” – “lossless”, that is, one that does not lead to information loss), for example, the FLAC codec. As a result, we will get a lower bit rate than the original, but the quality will remain unchanged; here is your first rebuttal.

Something else is worth adding here. The lossless compression output bitrate can be very different (but is generally lower than uncompressed audio); It depends on the complexity of the compressed signal, or rather on data redundancy. So simpler signals will compress better (ie we have smaller file size for the same duration => lower bitrate), and more complex signals will be worse. That’s why lossless classical music has a lower bitrate than, say, rock. But it must be emphasized that the bit rate here is in no way an indicator of the quality of the sound material.

Now let’s talk about lossy compression. First of all, you need to understand that there are many different encoders and formats, and even within the same format, the encoding quality for different encoders can differ (for example, QuickTime AAC encodes much better than outdated FAAC), not to mention the superiority of modern formats (OGG Vorbis, AAC, Opus) on MP3. Simply put, from two identical tracks encoded by different encoders with the same bit rate, some will sound better and some will sound worse.

Also, there is upconversion. That is, you can take a track in MP3 format with 96 kbps bit rate and convert it to 320 kbps MP3. Not only will the quality not improve (after all, data lost during the previous 96kbps encoding cannot be returned), it will even get worse. It is worth noting that at each lossy encoding stage (at any bit rate and any encoder) a certain amount of distortion is introduced into the audio.

And even more. There is one more nuance. If, say, the bit rate of an audio stream is 320 kbps, this does not mean that the 320 kbps was spent encoding that very second. This is typical for constant bit rate encoding and for those cases where a person, hoping for maximum quality, forces a constant bit rate too high (for example, setting CBR to 512 kbps for Nero AAC ). As you know, the number of bits assigned to a particular frame is regulated by the psychoacoustic model. But in case the allocated amount is much lower than the set bitrate, even the bit deposit is not saved (for terms see the article “What is CBR, ABR, VBR?”) – as a result, we get useless “zero bits” that simply “wrap up” the frame size to the desired one (that is, increase the size of the stream to the specified size). By the way, this is easy to check: compress the resulting file with a filing cabinet (preferably 7z) and look at the compression ratio – the more, the more zero bits (as they lead to redundancy), the more space wasted.

Bit rate as a characteristic of digital video and audio

Bit rate as a characteristic of digital video and audio

bit rate

Concept

bit rate

Bitrate: literally, the information bit rate. It is common to use the bit rate when measuring the effective information transmission rate through the channel, that is, the “payload” transmission rate (in addition to that, the channel can transmit service information, for example symbols start and stop for asynchronous transmission or control symbols for redundant coding). The baud rate, which takes into account the total bandwidth of the channel, is measured in baud.

Bit rate is the number of units of information required to store (transmit) one second of a stream of data (generally audio and video files). It is generally measured in ‘kbps’, kilobits per second.

The term bit rate is used in two basic meanings
: channel or device characteristic: the maximum number of bits that can be transmitted per unit of time.
– The amount of data stream transmitted in real time (the minimum channel size that this stream can pass through without delay).
– A special case is the compressed video or audio bit rate.
Bit rate is expressed in bits per second (bit / s, bps), as well as values derived with the prefixes kilo, mega, etc.

The term bitrate (along with subjective quality criteria) is often used as a characteristic to evaluate the performance of lossy compression algorithms.

Bitrate characterizes both the density of the information package and its quality. For example, out of two MP3 files compressed with different bit rates, a file with a higher bit rate will have higher sound quality (close to the original). At the same time, a file of a different format, with the same bit rate, can offer both better and worse sound quality.

On audio CDs, information is losslessly encoded at a constant 1407 kbps bit rate.

The MP3 format allows encoding audio information with constant or variable bitrate from 32 to 320 kbps, that is, they provide five times the compression compared to CD.

Bitrate and its calculation Bit rate (bit rate) Part 3

Bitrate and its calculation Bit rate (bit rate) Part 3

bit rate

coding.

bit rate

Codecs and Media Containers

Since 2014, the most common high definition video format is HD (Full HD), with a screen resolution of 1920 x 1080 pixels and a screen aspect ratio of 16 x 9. (This format is compatible with most modern LCD and plasma televisions, but not all are capable of providing a high quality picture.
The fact is that most of these televisions have a lower screen resolution than is necessary for viewing in Full HD, for example 1280×720. The HD format has varieties: 1080i and 1080p. As with other formats, the letters i and p represent progressively scanned or interlaced images.

But, unlike the usual PAL and NTSC formats, here with interlaced scanning the frame rate is 60 and with progressive scanning 50 frames per second. This is a standard, you can stick to it, but you can work around it too. The fact is that today a full HD format can only be played on a computer, there are no special devices (players) to watch it (HD DVD (gradually dying) and Blu-Ray disc players do not provide Full HD quality, but more on that later), therefore full compliance with the rules is no longer as important. The next most common high definition video quality and format is HDV, with a screen resolution of 1440 x 1080, but also with a 16×9 aspect ratio. This ratio is achieved by “stretching the pixels” horizontally, from 1440 to 1920. Therefore, for a Full HDV display, a FullHD television with a screen resolution of 1920×1080 is also required. Of course, the video quality in HDV format is lower than HD, but still, HDV format is quite common among users. The reason is that the HDV format was invented before HD, and even before the latter came out, a lot of video equipment was developed and released that only supports 1440×1080. High definition movies, generally recorded on HD DVD and Blu-Ray discs, also have an HDV resolution of 1440 x 1080. Even before the advent of HDV and HD, the 720p “high definition” format appeared. The resolution is 1280×720, the aspect ratio is 16×9. It is essentially a transitional format, from standard PAL to HDV and HD. The world’s first “high definition” hobby camcorder produced by JVC recorded at 720p. Even earlier, the PAL television format appeared in 720×576 resolution with 50 Hz interlaced scan. Now, this format is used in digital and satellite television (not HD). Now (2014-2017) I use mp4 format: mp4 – Full HD – 1920 x 1280, 16×9 variable bit rate 10 – 15 mbps for home viewing on 64 inch Full HD TV, this is enough. mp4 – HD – 1280 x 720, 16×9, variable bit rate 4-6 mbps. – if you need to save disk space, or if quality doesn’t really matter (or if you need to speed up rendering).
Источник: https://vseprost.ru/vybor-bitrejta-dlya-zapisi-multimedia.html

Bitrate and its calculation Bit rate (bit rate) Part 2

Bitrate and its calculation Bit rate (bit rate) Part 2

bit rate

Let’s go back to the DVD story for a moment.

bit rate

When the first analog-to-digital converters appeared in capture card form, it was claimed that 60 minutes of video could be put on a DVD-R with no loss of quality. In the claimed presentation data of the DVD format, the maximum bit rate of the multiplexed stream is 9.8 Mbit / s. When DVD recorders appeared that were capable of digitizing an analog signal in high quality, it was said that the recorder could fit up to 125 minutes on a disc without losing quality and up to 90 minutes if you wanted to save sound in PCM format.

We test, we verify, we write from both disk and videotapes; there is no visual difference even during pauses and in frame by frame mode (if the recorder is good). The bit rate that the recorders give to the output of the digitized image is 9000 Kbps and sometimes a little more. Why is the math not the same as the DVD burner result?

Probably because we do the calculation for a constant bit rate, and the recorders can already digitize video with a variable bit rate and have appropriate compression algorithms. By setting the upper limit of the bit rate at 9000 Kbps, you can achieve a good picture in video segments with dynamic actions, while in other parts of the same video the value of the bit rate can reach 2000 Kbps. noticed that when you record a video or a photo with a digital camera, the files have different sizes? Once the initial parameter is set, the codec itself chooses the value of the bit rate. Optimal bit rate for DVD video Considering the fact that up to 120 minutes of video can be recorded on DVD-R without quality loss, we ask ourselves: how to do this? Let’s consider 2 ways: 1. If you are using a DVD burner, set it to “lossless quality” mode and set to record. If your video is 60 minutes long, the recorder will not stretch it by 4. 36GB and it will only take up half the free space. 2. If you use a capture card or TV tuner, first capture as described here and then compress the resulting file with a quality program with modern codecs and multiple passes (at least the same Freemake Video Converter) at the speed of dvd5 for 120 minutes (don’t forget the menu). Consider an option when your video is short and you are not going to burn it to DVD-ROM or if you want to burn multiple MPEG-2 files to disc at once without losing quality. Below is a table calculated mathematically on the basis that you can fit 120 minutes of video on 4464MB of disk space (no menus). There are a few things to keep in mind: The table is written for MPEG-2 files. The table is not written for previously compressed videos. These values do not include a menu. Using different programs, you can get different results. The values in the table may vary depending on the content of the video. If the program has a bit rate option then you need to set “VBR” (variable). The values in the table are based on “lossless compression”. In this article, “lossless compression” refers to the viewing experience. In fact, in the analytical version, the word “compression” already denotes a loss of quality.
Источник: https://vseprost.ru/vybor-bitrejta-dlya-zapisi-multimedia.html

Bitrate and its calculation Bit rate (bit rate)

Bitrate and its calculation Bit rate (bit rate)

bit rate

Flow rate data per unit of time.

bit rate

Information flow is normally measured in bits and transit time in seconds (bit / s, bps). There are other quantities derived with the prefixes kilo- and mega- (kbit / s, kbit / s, kbps, Mbit / s, Mbps, Mbps). Bit rate is one of the main parameters of a video. Its value affects the size and quality of the video file. The bit rate is directly proportional to the quality and size of the file. The higher the bit rate, the better its quality and the larger the file size. Two types of speed must be distinguished: maximum bit rate: the maximum number of bits that can pass per unit of time, and bit rate: the bandwidth of the channel without delay.

Data stream compression modes

Constant Bit Rate Constant Bit Rate (CBR) is the encoding of the data stream, specified by the user and has a constant value throughout the length of the file. This mode improves compatibility and the ability to calculate more accurately, but can increase the size of the output file. Do not use this mode for dynamic scenes (sports programs, action movies, etc.) and when objects are moving in different directions. Variable Bit Rate (VBR) Variable Bit Rate is a mode in which the codec determines the amount of information stream transmitted based on the complexity of a given file segment. This mode produces the best quality in an optimal size and prevents flickering. The disadvantages of this method include only the unpredictability of the output file size and the possibility of incompatibility. Variable bit rate is actively used for burning Blu-Ray and DVD discs, where there is no limitation on the size of the file as such. Average Bit Rate (ABR) Average Bit Rate is a combination of variable and constant bit rates set by the user. Unlike variable bitrate, the data stream varies within strict limits and does not reach the minimum and maximum values. This allows you to predict the output file size much more accurately than VBR and improve video quality in fast-moving video scenes. The method was applied in the network. This mode is sometimes used to compress audio.

Bitrate calculation

Having mastered what the bit rate is and having disassembled the compression modes of the flow of information, we can proceed to the independent calculation of the bit rate. Let’s establish the conditions of the problem: video: home video 120 minutes long sound: present; menu: necessary; DVD-R Media (DVD + R) 4.36 GB; Output format: DVD (MPEG-2) DVD-R size: 4.36GB = 4464MB. Size is critical, so we will be calculating from 4300MB for several reasons: 1. Bitrate cannot be accurately calculated and the file may be larger than planned. All full disk space sometimes leads to improper disk startup. 3. Many programs are recoding based on this value. We subtract another 300MB for the menu and the audio track (if your sound is not in PCM format, whose bit rate is much higher, and if you don’t plan to create multiple audio tracks) and we get 4000MB. 4000: (120 * 60) = 0.556 Mbps = 0.556 * 8 = 4.444 Mbps = 4.444 * 1024 = 4551 Kbps. For a high-quality DVD-Rip, this value is ideal, but for MPEG-2 it is barely supportable. The fact is, different video formats need different bitrate values for an acceptable picture. You can try to play this video and if there are dynamic moments, you will see artifacts in the shape of squares in the video. It follows from this that you need to reduce the length of the file to about 60 minutes or look for other compression methods.