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

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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

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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.

What is the bit rate and how does it influence the quality of the videos?

Amid the pandemic we are facing and authorities increasingly asking people to stay home, the use of the Internet, especially broadcast services, is skyrocketing. Amazon Prime Video, Netflix, YouTube, Twitch and others have already announced measures to try to ensure everyone accesses their videos without gagging, but there are differences between the measures on some platforms.

YouTube reduces standard video quality to SD worldwide

Netflix, for example, opted for a reduction in the data rate or bit rate without lowering the resolution of the video itself. YouTube is already one of the platforms that now forces you to load at a lower resolution while maintaining the data rate, that is, the final quality, and allows you to increase the image size manually by the user.

bitrate

Oops wait! So does reducing resolution not reduce the quality and quantity of data to transfer? Not quite. Resolution is not the only thing that defines the quality of a video image, or even a JPG image, audio and the like, there are a number of factors. Among them, in addition to the image size, the bit rate that will be transferred from a server to a device, for example.

Data rate versus bandwidth

Reducing the amount of data sent to each user can help guarantee the service for everyone (Photo: Pixabay)
To understand metering on Netflix, you first need to understand the difference between the data rate of a media file and the bandwidth of the connection. Both can be called bitrate and throughput, and whether those terms are correct or not matters little. What matters is that it confuses, so it is necessary to clarify it.

The data rate of a media file refers to the maximum size of a second of the video. A video, as you may already know, is divided into frames, the most common speed is 30 fps (30 frames per second). Each table has its own set of information, and the total of 30 (or 24, 60, 120, and the like) forms the bitrate.

The bandwidth of the connection is the speed of your internet. Brazilian 4G, for example, has an average of 20 Mbps. Some fixed broadband operators offer packages of 100 Mbps, 200 Mbps or even more. This rate is the maximum amount of data that your Internet can receive from a central server.

Data volume

YouTube chose to lower the standard resolution without decreasing the volume of data (Photo: Pixabay)
The bit rate of a media file, therefore, is the amount of data it has each second. Netflix reduced this rate to decrease the amount of information that its servers need to send to each user connected to the platform. This reduces the quality of the image because it is less data, which can slightly reduce sharpness and cause noise, which some call “pixelization”, especially in very dark areas of the frame.

The resolution is not the lowest: it is that this image has less information. When loaded onto a large screen such as a TV, details are missing to display. On smaller screens, you will hardly notice the difference.

Facebook and Instagram will reduce the quality of video in Brazil
Globoplay will reduce video quality to meet demand
In short, Netflix’s decision ensures resolution, keeping sharpness a little closer than the user is used to, but reducing the amount of data transferred, resulting in images with a lower level of detail and sometimes , even more noise, even.

By sending less information to each user, Netflix, as well as Facebook, Globoplay and other services with similar measures, the platform avoids what we call server bottlenecks. This could cause suffocation and connection failures. YouTube’s measure also alleviates traffic because not everyone will manually increase the resolution, which in itself already reduces the amount of information to be transferred.

What is a video bit rate? What is mp3

The bit rate is of two types:

internal: the number of bits transmitted per second;

external: data rate and its value for real-time transmission (to watch a movie or listen to music).

Let me remind you that high bitrate usually means better quality, however this may depend on the source file.

How to find out the bit rate of a specific file?

It can usually be found right inside

And what is the difference, let’s see?

There is said to be little difference. 🙂 In my opinion)) (hearing), it is necessary to listen to music not through the speakers for 100 rubles, and certainly not through a portable speaker. C and everything fits immediately: it does not sound, but cacophony, if the bit rate is less than 120 kbps.

Bitrate

Different bit rates for people who work with sound. Well, to listen at home, any bitrate, even the lowest bitrate, will. Here it is, as the saying goes, an amateur.

Incidentally, one of the “representatives” of music with a high bit rate is the .flac format. . , the bit rate weighs less than 800-1000 kbps, however it takes up more space, such a song can weigh 30mb, and the album less than 400.

I hope this explanation of “What is the bit rate in music” has helped me a little? Please leave the comments below so I can reply to you.
Don’t be afraid of me and add

With the concept of “bit rate” we are faced with the mention of files in audio and video format. To understand the essence of this term, you must master file compression and encoding. German scientists have established the general principle of compressing files with minimal loss. Using the MP3 encoding example, the source audio file is cut into chunks lasting 50 milliseconds, each of which is analyzed separately. In the analysis, the fragment is broken down into harmonics according to the Fourier method, of which, according to the theory of sound perception, the harmonics that the person perceives worse than the rest are expelled from the human ear. These are quieter harmonics in the context of the stronger ones. As a result, sounds masked by hearing inertia are ejected (for example, if a very short beep sounds at once, with a delay of a fraction of a second, some other short-term signal is heard, then it will not be heard. ) The remaining harmonic information after filtering is recorded in an MP3 file, which results in a much smaller size than the original WAV. The WAV file stores complete information about the original sound, digitized and quantized at a frequency of 44 kHz. This information is stored on normal audio CDs. During playback, a reverse transformation is performed, in which the remaining harmonics are converted back into a sound wave. Some information about the original signal has disappeared, therefore the sound is not the same as the original. But insignificant sounds have been thrown, so the human ear cannot distinguish the signal from the original, which it was before packaging in MP3.

Bit rate is the amount of information per unit of time. Its essence: how much information about each second of the registry can we spend. Of course, the smaller it is, the smaller the files are with the same duration over time, so they have to throw more “extra” harmonics. Bit rates have units of measure: kilobits per second (Kbps) and megabits per second (Mbps). The MP3 audio compression algorithm is often used with 128 kbps compression. They are of two types: fixed and variable. So with video compression, if a constant bit rate is applied, a fixed amount of data is used to encode a second of a movie. In the case of variable bitrate, the codec sets its own bitrate value based on the scene in the movie. For example, when encoding in MPEG, in practice, the compression gain is obtained by saving only the difference between adjacent frames. With a slow scene change, the difference between the frames is small, and therefore it is possible to reduce the bit rate required to reproduce these scenes.

What is bitrate?

Good and technological days surely you have heard the word bitrate when an expert talks about videos in digital format, but if you don’t know what is what it consists of we tell you the same as the resolution and the final format of digital video another factor determinants to obtain an excellent image quality is the bitrate specifically the bit rate is the flow or the data rate, that is the amount of information when playing a video that reads on our computer per second.

For that reason and in the same way that happens with the size of the image how much the greater the data flow the greater the quality of the material in fact the bit rate can be even more decisive than the size of the image to define its quality the breed even though we have a great video size if the data flow is poor the material will be of poor quality by example a 352 x 288 resolution vcd with 1150 kilobits per second will be of higher quality than one of 720 x 576 resolution and 300 kilobits per second in this example.

If one of them has a screen size the greater its bandwidth is scarce because this data stores the information referred to the luminaire and the color of the video for that reason. When the flow of data is poor the computer will have to group a lot of pixels that contain the same information this generates a redundancy that affects the video quality but as always it is better to put a practical example.

Now we are going to lower the bit rate to this video that is the number of ones and zeros that are being used to encode it and as you can imagine youtube is going to change this as soon as we upload it to the channel but you cannot put the details again in the video, so even though you are watching it at the highest quality allowed between what you’re seeing is a version limited.

Right now we have a reasonable bit rate although it’s almost not looks so bad with modern rating and some details may be missed but still you can perfectly see what is going on now let’s add a few stars all of a sudden all those bits are not getting using to represent me but the opposite actually are used to keep track of everything around me now we add many more stars As you can see, the more things there are in the background, the more demanding the video with the bitrate we add a few more right now no matter how much I tried the encoder to optimize my face or skin tone just not it has enough if you look it’s not about if there are many or few stars but of movement if we freeze this whole scenario and what we treat as a background the quality of the video will return and if we upload again the bitrate we will have an ops video quality

What is the normal bit rate on an MP3?

A normal bit rate for an MP3 is between 128 kilobits per second, or kbps, and 320 kbps. Different bit rates in this range have different advantages; To rip music from CD to MP3, choose the bit rate that best suits your purposes. In general, the higher the bit rate of an MP3, the better the audio quality, but the larger the file size. The most common bit rates in MP3s are 128 kbps, 192 kbps, and 320 kbps.

Bit rate

The bit rate of an MP3 indicates the density of the audio information contained in the file. Therefore, every second on a 192 kbps MP3 contains 192 kilobits (24 bytes) of data. The higher the bit rate, the more information the MP3 contains; the more information it contains, the quality is closer to the original audio recording. The bit rate also determines the size of the MP3 file: a four-minute song encoded at 128 kbps takes up just over 3.5 MB, while the same song encoded at 320 kbps requires more than 9 MB of space.

Choosing a bit rate

When you convert a sound file or rip your CD collection to MP3, you must specify the bit rate you want the encoder to use. Choose a bit rate based on the type of audio you are encoding and its intended purpose. If you are converting a conference or other piece of vocal audio, a 128kbps bitrate is more than enough. If you’re encoding MP3 files for use with a portable media player, a 192kbps bitrate usually provides a good balance between audio quality and file size. If you are converting your CD collection to MP3 for archiving, encode the files with a 320 kbps bit rate.

Variable bit rate

Encoding with a variable bit rate changes the MP3 bit rate depending on the type of data present at a certain point in the audio. For example, a variable bit rate encoder could encode a dense piece of information from an MP3 at 320 kbps; however, when the audio contains a mute section, the encoder lowers the bit rate to 32 kbps. If the bit rate of an MP3 has an unusual number (for example, 204 kbps), this indicates that the MP3 creator encoded it with a variable bit rate.

Bit rate conversion

Although most MP3 encoding and conversion programs can modify an MP3 at a different bit rate, this is not a good idea, generally speaking. Converting an MP3 to a higher bit rate does not add audio information to the file, so the sound quality is not increased. Converting an MP3 to a lower bit rate reduces the file size, but could also introduce audio defects, since the encoder is compressing a file that is already compressed. If you need an MP3 file to have a different bit rate, re-encode an MP3 from the original audio CD or WAV file.

MP3 Bit Rate: What Does It Mean?

Meaning of bit rate and what MP3 bit rate to use

MP3 is a popular digital audio encoding format. When looking at the bit rate of an MP3, generally the higher the bit rate, the better the sound quality. A lower bit rate is only useful when space is minimal.
What does the bit rate mean

The bit rate of an MP3 file is a measure of the performance of audio data over a specified period of time. Simply put, it is the number of bits that are processed each second.
For example, audio data in an MP3 file that has been encoded with a constant bit rate (CBR) of 128 kilobits per second (kbit / s) is processed at 128,000 bits per second. For audio that has been encoded at a variable bit rate (VBR), the displayed value is an average.

The higher the bit rate, the better the sound quality will be when playing a lossy audio format tune. To put digital audio compression into perspective when it comes to bit rates, a standard audio CD, which contains uncompressed audio data, has a bit rate of 1,411 kbit / s. This is much higher than the best bit rate for MP3, which is 320 kbit / s.

Does the bit rate matter?

Unless you consider yourself an audiophile and have a top-notch pair of headphones to wear while listening to your music, the bit rate of your MP3s may not be as important.

If you use low-cost headphones with your iPod, you won’t be able to hear the difference in your music. Even with premium headphones, the difference between high and low bit rates is most noticeable in just a few areas:
Some details in low bitrate MP3 may be missing.
You may not be able to hear subtle background tracks.
You may hear a slight distortion.
Use an audio file converter to change the bit rate of an MP3.
Here are some examples of how audio quality differs as bit rate increases:
32 kbit / s: Generally used only for spoken audio
96 kbit / s: low quality voice or transmission
128 or 160 kbit / s: midrange bit rate quality
192 kbit / s: medium quality bit rate
256 kbit / s – A commonly used high quality bit rate
320 kbit / s – The highest bit rate level MP3 supports