Understanding Video Bitrates and Codecs

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Understanding Video Bitrates and Codecs

Video bitrate and codec are two important concepts that every video creator should understand. In this article, I will explain what they are, how they work together, and how to choose the right settings for your videos.

What is Video Bitrate?

Video bitrate is the amount of data that is encoded per second in a video file. It is measured in bits per second (bps), or kilobits per second (kbps) or megabits per second (Mbps).

The higher the bitrate, the more data is encoded, and the higher the quality of the video will be. However, a higher bitrate also means a larger file size.

What is a Video Codec?

A video codec is a software program that compresses and decompresses video data. It is responsible for encoding the video data into a format that can be stored or streamed, and then decoding it back into its original form when it is played back.

There are many different video codecs available, each with its own strengths and weaknesses. Some of the most popular video codecs include:

H.264: This is the most widely used video codec. It is a lossy codec, which means that some data is lost during the compression process. However, H.264 is very efficient, and it can produce high-quality video with a relatively small file size.
H.265: This is a newer codec that is designed to be more efficient than H.264. It can produce the same quality of video with a smaller file size.
VP9: This is a free and open-source video codec that is developed by Google. It is similar to H.265 in terms of efficiency, but it is not as widely supported.

How Do Bitrate and Codecs Work Together?

Bitrate and codec work together to determine the quality and file size of a video. The higher the bitrate, the more data is encoded, and the higher the quality of the video will be. However, a higher bitrate also means a larger file size.

The codec determines how the video data is compressed. Some codecs are more efficient than others, and they can produce the same quality of video with a smaller file size.

How to Choose the Right Bitrate and Codec for Your Videos

The right bitrate and codec for your videos will depend on a number of factors, including:

The intended use of the video. If you are uploading your video to YouTube, you will need to choose a bitrate that is compatible with YouTube’s streaming requirements.
The target audience. If you are creating a video for mobile devices, you will need to choose a lower bitrate than if you are creating a video for high-definition televisions.
The file size. If you are limited by the file size, you will need to choose a lower bitrate.

Final Words About Video Bitrates and Codecs

Video bitrate and codec are two important concepts that every video creator should understand. By understanding how they work together, you can choose the right settings for your videos to ensure that they are both high quality and have a reasonable file size.

I hope this article has been helpful. If you have any questions, please feel free to leave a comment below.

Bonus Tips

If you are not sure what bitrate or codec to use, you can always start with a high bitrate and then lower it until you find a balance between quality and file size that you are happy with.
You can use a video bitrate calculator to help you determine the right bitrate for your videos.
There are many different video codecs available, so it is important to do some research to find the best codec for your needs.

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What video bitrate is appropriate for video?

At present, 720p video recommended minimum bitrate is above, h.264 encoding 2M bitrate is adequate, 1080p is 4M enough
to get a high-quality video, convert it with different bitrates, and then compare the image quality.

The most commonly used are: h.264 encoding, 1080P, 2.5M bit rate or more.
Summary: [h.264 encoding, 2.5M bitrate (up to 4M), maximum 4M bitrate (add 2M to target), most platforms are Blu-ray. 】

1. If the bitrate is higher than the original video, it will not be a bit higher than the original video. When you move, you’ll pick a lower point to compress the file a bit.
2. 1080P 1M bitrate has distortion feeling to watch on computer, and 2M can’t see distortion, you can adjust the bitrate to 4M to get the best.
The following are the bitrate upload requirements for a platform:

How much video bitrate is appropriate (above H.264 bitrate, 720P, 1080P output bitrate setting)

***Normal 240p, 320p SD, 480p HD, 720p Ultra HD, 1080p Full HD (Blu-ray), 2K, 4k Ultra HD ***
Normal 240P (320×240 standard resolution, it was 3GP, this is basically nobody used)
SD 270P<0.8M (360×270 standard resolution, was 3GP, rarely used) [140M when storing 422 materials]

High definition 480P (360P)>=0.8M (standard resolution of 640 × 480, minimum 480 * 360, was 3GP) [480 re-advertising is called high definition, but the normative statement can only be regarded as standard definition]

What does MP3 bitrate mean?

Bit rate

The rate at which a digital channel transmits digital signals is called the data transfer rate or bit rate.
The word bitrate has many translations, such as bitrate, etc., which indicates how many bits per second the encoded (compressed) audio data should be represented, and a bit is the smallest binary unit, either 0 or 0. 1. The relationship between bitrate and audio and video compression is simply that the higher the bitrate, the better the quality of the audio and video, but the larger the encoded file; if the bitrate is lower, the situation is reversed.

For example: encode audio and video at 500 Kbps.
where bps are bits 1K = 1010 = 1024
b is little
s is the second
p is for (for)
Therefore, encoding at 500 kbps means that the encoded audio and video data must be represented at 500 K bits per second.
In the baseband transmission system, the bit rate is used to represent the code rate of transmitted information.
The bit rate Rb refers to the unit of time
The number of binary bits transmitted within the unit, the unit is b/s. For example, the transmission speed of a computer serial port is up to 115200b/s.
The symbol rate or baud rate Rs refers to the number of modulation symbols transmitted per unit of time, that is, ternary and ternary
The information transmission rate of the multivariate digital code stream in the

In M-ary modulation, the relationship between the bit rate Rb and the baud rate Rs is:
Rb=Rslog2M
The sampling rate refers to the ratio of the sampling samples to the total number of samples, and the sampling rate refers to the number of samples per unit of time. If it is an instrument, the sampling rate is 40MSa/s, which indicates that the number of samples per second is 40M, but it cannot be represented by 40MHz.

The process of converting analog audio to digital audio is called sampling. In a nutshell, how much data is needed to record a 1 second duration of sound via waveform sampling. A sound with a sample rate of 44 KHz requires 44,000 data points to describe a 1-second sound waveform. In principle, the higher the sample rate, the better the sound quality.

What is bit rate? Knowledge of the MP3 audio format.

Digital audio formats are audio signals that are recorded, processed, and reproduced in digital form.

The emergence of digital audio formats is to meet the needs of high-fidelity playback, storage and transmission. Simply put, early analog audio formats had issues with playback distortion and glitches due to media wear. Since the advent of CD discs, audio files in digital format have become popular, but another problem has arisen: the limitation of storage volume and the phenomenon of CD disc wear is still present. Saving to a hard drive (in connection with longer storage time) is also not a good solution when storage media (mainly hard drives) are still expensive at the time. The rise of the Internet has created a requirement for long-distance file transmission. Under the restriction of bandwidth, the demand to reduce file size has become more intense. All this has led to the generation of lossy compressed digital audio formats from external factors!

In terms of internal factors, with the improvement of computing and coding capabilities, the progress of various acoustic psychological models has promoted the emergence of various lossy compressed digital audio formats. Some of the most commonly used audio formats in MP3 players are briefly introduced below: MP3 (CBR, VBR, ABR), WMA, WAV, ADPCM, and the emerging audio formats AAC, ASF, and OGG.

Before introducing various digital audio formats, let’s clarify one concept: bitrate.

In the field of computing, all information is digitized. Bit is the smallest unit of data in a computer, it refers to a number of 0 or 1, which is a mathematical binary number, a “0” or “1” , is a bit. For example, when we say a 2-digit number, it means that it is a two-digit binary number, and there are 4 combinations of “00”, “01”, “10” and “11”, which represent 0, “11” in decimal respectively. 1, 2 and 3 are four numbers.

Bit rate factor – how does it contribute to video quality?

Bit rate is a very important factor for good video quality. In the camera settings we now find more numbers next to the resolution. The one behind Mbps interests us more now. This is the information about the bit rate.

Video Bit Rate

This number indicates how much information is processed in the video per second. The higher this rate, the better the quality. Of course, the final file the camera produces will increase with the bit rate.

In this way, you can also calculate how much information is available for each frame, that is, each individual image. Suppose you are shooting with 25p and you have an available bit rate of 100 Mbps. That would mean that each image carries 4 Mbps of information. If you shot 50p at the same bit rate, it would only be 2 Mbps per image! The result would be a loss of image quality.

Color depth factor – How does it contribute to video quality?

Bottom line: color depth is the maximum number of different color shades that a camera can display. Of course, the same applies to monitors, printers, televisions, etc.

The colors in general in our image consist of additive combinations of the three basic colors red, blue and green.

The gradations in each tone are again given in bits. Videos consist of pixels, that is, square image points. Each of these pixels carries with it certain color information. The higher the bit rate of the color depth, the more different shades of color each pixel can have.

The total number of color tones is calculated by adding 2 to the power of the number of bits; for an 8-bit camera, for example, that would be 256 colors per base color. Now you have to multiply the other two basic colors again to determine the total number of possible color tones. This means that an 8-bit sensor can display 28 * 28 * 28 colors. That’s over 16 million shades!

Thus, a 10-bit camera can display more than 1 billion colors, a 12-bit camera 68 billion colors, and a 14-bit camera even more than 4 billion color combinations.

Summary:

Many users are not fully aware of how bit rate influences video quality.
People usually see numbers next to the name of the format (Mp4, MOV, AVI) and do not know exactly what it is.

Here we have tried to explain that the higher the bit rate, the more colors.
Perhaps you think that speaking of so many millions of colors, and it is enough, but it is not like that. Actually reality has a practically infinite number of color gamut, so to capture it with realism, it is necessary to have as many colors as possible.